Patent Publication Number: US-2022233087-A1

Title: Magnetic sensor and inspection device

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2021-010239, filed on Jan. 26, 2021; the entire contents of which are incorporated herein by reference. 
     FIELD 
     Embodiments described herein relate generally to a magnetic sensor and an inspection device. 
     BACKGROUND 
     There is a magnetic sensor that uses a magnetic layer. There is an inspection device that uses the magnetic sensor. It is desirable to increase the sensitivity of the magnetic sensor. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIGS. 1A to 1C  are schematic views illustrating a magnetic sensor according to a first embodiment; 
         FIG. 2  is a schematic view illustrating a magnetic sensor according to the first embodiment; 
         FIGS. 3A to 3C  are schematic views illustrating the magnetic sensor according to the first embodiment; 
         FIG. 4  is a schematic view illustrating the magnetic sensor according to the first embodiment; 
         FIGS. 5A to 5C  are schematic views illustrating a magnetic sensor according to a second embodiment; 
         FIGS. 6A to 6C  are schematic views illustrating a magnetic sensor according to the second embodiment; 
         FIGS. 7A and 7B  are schematic views illustrating characteristics of the magnetic sensor according to the embodiment; 
         FIGS. 8A and 8B  are schematic views illustrating characteristics of the magnetic sensor according to the embodiment; 
         FIGS. 9A to 9C  are graphs illustrating characteristics of the magnetic sensor according to the embodiment; 
         FIG. 10  is a schematic view illustrating a magnetic sensor according to a third embodiment; 
         FIG. 11  is a schematic view illustrating the magnetic sensor according to the third embodiment; 
         FIGS. 12A to 12C  are schematic cross-sectional views illustrating the magnetic sensor according to the third embodiment; 
         FIGS. 13A to 13C  are schematic cross-sectional views illustrating the magnetic sensor according to the third embodiment; 
         FIGS. 14A to 14C  are schematic views illustrating magnetic sensors according to the third embodiment; 
         FIGS. 15A and 15B  are schematic views illustrating a magnetic sensor according to the third embodiment; 
         FIGS. 16A and 16B  are schematic views illustrating a magnetic sensor according to the third embodiment; 
         FIG. 17  is a schematic view illustrating an inspection device according to a fourth embodiment; 
         FIG. 18  is a schematic view illustrating an inspection device according to the fourth embodiment; 
         FIG. 19  is a schematic perspective view showing an inspection device according to the fourth embodiment; 
         FIG. 20  is a schematic plan view showing the inspection device according to the fourth embodiment; 
         FIG. 21  is a schematic view showing the magnetic sensor and the inspection device according to the fourth embodiment; and 
         FIG. 22  is a schematic view showing the inspection device according to the fourth embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     According to one embodiment, a magnetic sensor includes a first sensor part, and a conductive member. The first sensor part includes a first magnetic element, a first side magnetic part, and a first counter side magnetic part. The conductive member includes a first corresponding portion along the first magnetic element. The first magnetic element includes a first magnetic layer, a first counter magnetic layer, a direction from the first magnetic layer toward the first counter magnetic layer being along a first direction, and a first intermediate magnetic layer located between the first magnetic layer and the first counter magnetic layer. The first side magnetic part includes a first side magnetic layer. The first counter side magnetic part includes a first counter side magnetic layer. The first intermediate magnetic layer is between the first side magnetic layer and the first counter side magnetic layer in a second direction crossing the first direction. 
     According to one embodiment, an inspection device includes the magnetic sensor described above, and a processor configured to process a signal output from the magnetic sensor. 
     Various embodiments are described below with reference to the accompanying drawings. 
     The drawings are schematic and conceptual; and the relationships between the thickness and width of portions, the proportions of sizes among portions, etc., are not necessarily the same as the actual values. The dimensions and proportions may be illustrated differently among drawings, even for identical portions. 
     In the specification and drawings, components similar to those described previously or illustrated in an antecedent drawing are marked with like reference numerals, and a detailed description is omitted as appropriate. 
     Exemplary embodiments will now be described with reference to the drawings. 
     The drawings are schematic or conceptual; and the relationships between the thickness and width of portions, the proportional coefficients of sizes among portions, etc., are not necessarily the same as the actual values thereof. Furthermore, the dimensions and proportional coefficients may be illustrated differently among drawings, even for identical portions. 
     In the specification of the application and the drawings, components similar to those described in regard to a drawing thereinabove are marked with like reference numerals, and a detailed description is omitted as appropriate. 
     First Embodiment 
       FIGS. 1A to 1C  are schematic views illustrating a magnetic sensor according to a first embodiment.  FIG. 1A  is a plan view.  FIG. 1B  is a line Y 1 -Y 2  cross-sectional view of  FIG. 1A .  FIG. 1C  is a line X 1 -X 2  cross-sectional view of  FIG. 1A . 
     As shown in  FIGS. 1A to 1C , the magnetic sensor  110  according to the embodiment includes a first sensor part  10 A. 
     The first sensor part  10 A includes a first magnetic element  11 E, a first side magnetic part  11 S, and a first counter side magnetic part  11 SA. 
     As shown in  FIGS. 1B and 1C , the first magnetic element  11 E includes a first magnetic layer  11 , a first counter magnetic layer  110 , and a first intermediate magnetic layer  11   i . The direction from the first magnetic layer  11  toward the first counter magnetic layer  110  is along a first direction. 
     The first direction is taken as a Z-axis direction. One direction perpendicular to the Z-axis direction is taken as a Y-axis direction. A direction perpendicular to the Z-axis direction and the Y-axis direction is taken as an X-axis direction. 
     The first intermediate magnetic layer  11   i  is located between the first magnetic layer  11  and the first counter magnetic layer  110 . 
     In the example, the first magnetic element  11 E includes a first nonmagnetic layer  11   n  and a first intermediate nonmagnetic layer  11   in . The first nonmagnetic layer  11   n  is located between the first magnetic layer  11  and the first intermediate magnetic layer  11   i . The first intermediate nonmagnetic layer  11   in  is located between the first intermediate magnetic layer  11   i  and the first counter magnetic layer  110 . 
     At least one of the first magnetic layer  11 , the first counter magnetic layer  110 , or the first intermediate magnetic layer  11   i  includes, for example, at least one selected from the group consisting of Co, Fe, and Ni. These magnetic layers include, for example, at least one selected from the group consisting of CoFe, CoFeNi, and NiFe. These magnetic layers are, for example, ferromagnetic layers. 
     The first intermediate nonmagnetic layer  11   in  includes, for example, Ru. For example, the first intermediate magnetic layer  11   i  and the first counter magnetic layer  110  have antiferromagnetic coupling. 
     In one example, the first nonmagnetic layer  11   n  is conductive. The first nonmagnetic layer  11   n  includes, for example, at least one selected from the group consisting of Cu, Au, and Ag. For example, the first nonmagnetic layer  11   n  is a Cu layer. The first magnetic element  11 E is, for example, a GMR (Giant Magnetic Resistance) element. 
     In another example, the first nonmagnetic layer  11   n  is insulative. The first nonmagnetic layer  11   n  includes, for example, MgO. In such a case, the first magnetic element  11 E is, for example, a TMR (Tunnel Magneto Resistance) element. 
     As shown in  FIG. 1B , the first side magnetic part  11 S includes a first side magnetic layer  11   s . The first counter side magnetic part  11 SA includes a first counter side magnetic layer  11   os . The first intermediate magnetic layer  11   i  is between the first side magnetic layer  11   s  and the first counter side magnetic layer  11   os  in a second direction that crosses the first direction. The second direction is, for example, the Y-axis direction. 
     In the example, the first side magnetic part  11 S further includes a first stacked side magnetic layer  11   ss . The first counter side magnetic part  11 SA further includes a first counter stacked side magnetic layer  11   oss . The first counter magnetic layer  110  is between the first stacked side magnetic layer  11   ss  and the first counter stacked side magnetic layer  11   oss  in the second direction (e.g., the Y-axis direction). 
     For example, the magnetization of the first intermediate magnetic layer  11   i  is made uniform by the first side magnetic layer  11   s  and the first counter side magnetic layer  11   os . The magnetization of the first intermediate magnetic layer  11   i  stabilizes. For example, the magnetization of the end portion in the Y-axis direction of the first intermediate magnetic layer  11   i  is made uniform by the first side magnetic layer  11   s  and the first counter side magnetic layer  11   os . The sensitivity of the magnetic sensor is improved by the magnetization of the first intermediate magnetic layer  11   i  stabilizing. 
     For example, the magnetization of the first counter magnetic layer  110  is made uniform by the first stacked side magnetic layer  11   ss  and the first counter stacked side magnetic layer  11   oss . The magnetization of the first counter magnetic layer  110  stabilizes. For example, the magnetization of the end portion in the Y-axis direction of the first counter magnetic layer  110  is made uniform by the first stacked side magnetic layer  11   ss  and the first counter stacked side magnetic layer  11   oss . For example, the magnetization of the first intermediate magnetic layer  11   i  is further stabilized by the magnetization of the first counter magnetic layer  110  stabilizing. According to the embodiment, a magnetic sensor can be provided in which the sensitivity can be increased. 
     As shown in  FIG. 1B , the first side magnetic part  11 S may further include a first side nonmagnetic layer  11   sn . The first side nonmagnetic layer  11   sn  is located between the first side magnetic layer  11   s  and the first stacked side magnetic layer  11   ss . As shown in  FIG. 1B , the first counter side magnetic part  11 SA may further include a first counter side nonmagnetic layer  11   osn . The first counter side nonmagnetic layer  11   osn  is located between the first counter side magnetic layer  11   os  and the first counter stacked side magnetic layer  11   oss . For example, the first side nonmagnetic layer  11   sn  and the first counter side nonmagnetic layer  11   osn  include a material that is included in the first intermediate nonmagnetic layer  11   in.    
     An insulating member  65  may be located around the first magnetic element  11 E, the first side magnetic part  11 S, and the first counter side magnetic part  11 SA. 
     According to the embodiment, a portion of the insulating member  65  may be located between the first side magnetic layer  11   s  and the first stacked side magnetic layer  11   ss  and between the first counter side magnetic layer  11   os  and the first counter stacked side magnetic layer  11   oss.    
     As shown in  FIG. 1A , the length along the second direction (the Y-axis direction) of the first magnetic element  11 E is taken as a first length L 1 . The first magnetic element  11 E includes a first end portion  11 Ee and a first other-end portion  11 Ef. The direction from the first end portion  11 Ee toward the first other-end portion  11 Ef is along the second direction (e.g., the Y-axis direction). The first end portion  11 Ee and the first other-end portion  11 Ef correspond to two end portions in the Y-axis direction of the first magnetic element  11 E. 
     As shown in  FIG. 1A , the length along a third direction of the first magnetic element  11 E is taken as a first width w 1 . The third direction crosses a plane that includes the first and second directions. The third direction is, for example, the X-axis direction. According to the embodiment, the first length L 1  is greater than the first width w 1 . For example, the magnetization of the magnetic layer included in the first magnetic element  11 E is along the Y-axis direction. For example, the first length L 1  is not less than 10 times and not more than 100 times the first width w 1 . 
     For example, the magnetization of the first counter magnetic layer  110  has one of a first orientation or a second orientation. For example, the magnetization of the first intermediate magnetic layer  11   i  has the other of the first orientation or the second orientation. The first orientation is from the first end portion  11 Ee toward the first other-end portion  11 Ef. The second orientation is from the first other-end portion  11 Ef toward the first end portion  11 Ee. 
     For example, the magnetization of the first side magnetic layer  11   s  and the magnetization of the first counter side magnetic layer  11   os  have the same orientation as the magnetization of the first intermediate magnetic layer  11   i . For example, the magnetization of the first stacked side magnetic layer  11   ss  and the magnetization of the first counter stacked side magnetic layer  11   oss  have the same orientation as the magnetization of the first counter magnetic layer  110 . 
     As shown in  FIG. 1B , the length along the first direction (the Z-axis direction) of the first magnetic element  11 E is taken as a first thickness t 1 . The first length L 1  is greater than the first thickness t 1 . 
     As shown in  FIG. 1B , the distance along the second direction (the Y-axis direction) between the first side magnetic part  11 S and the first magnetic element  11 E is taken as a distance g 1 . The distance g 1  is, for example, not more than 0.01 times the first length L 1 . Because the distance g 1  is not more than 0.01 times the first length L 1 , for example, the stabilization of the magnetization of the magnetic layer included in the first magnetic element  11 E by the first side magnetic part  11 S is effectively obtained. Because the distance g 1  is not less than 0.001 times the first length L 1 , the electrical insulation between the first side magnetic part  11 S and the first magnetic element  11 E is stabilized. 
     As shown in  FIG. 1B , the distance along the second direction (the Y-axis direction) between the first counter side magnetic part  11 SA and the first magnetic element  11 E is taken as a distance g 2 . The distance g 2  is, for example, not more than 0.01 times the first length L 1 . Because the distance g 2  is not more than 0.01 times the first length L 1 , for example, the stabilization of the magnetization of the magnetic layer included in the first magnetic element  11 E by the first counter side magnetic part  11 SA is effectively obtained. Because the distance g 2  is not less than 0.001 times the first length L 1 , the electrical insulation between the first counter side magnetic part  11 SA and the first magnetic element  11 E is stabilized. 
     In the example as shown in  FIGS. 1A and 1C , the first sensor part  10 A further includes a first magnetic member  51  and a first counter magnetic member  51 A. The direction from the first magnetic member  51  toward the first counter magnetic member  51 A is along the third direction. The third direction crosses a plane that includes the first and second directions. The third direction is, for example, the X-axis direction. 
     As shown in  FIG. 1C , the first magnetic element  11 E overlaps a region  66   a  between the first magnetic member  51  and the first counter magnetic member  51 A in the first direction (the Z-axis direction). The region  66   a  may be, for example, a portion of the insulating member  65 . 
     As shown in  FIG. 1C , for example, a portion of the first magnetic element  11 E overlaps a portion of the first magnetic member  51  in the first direction (the Z-axis direction). Another portion of the first magnetic element  11 E overlaps a portion of the first counter magnetic member  51 A in the first direction. 
     The magnetic field of the detection object is concentrated by the first magnetic member  51  and the first counter magnetic member  51 A. The concentrated magnetic field is efficiently applied to the first magnetic element  11 E. Higher sensitivity is obtained thereby. For example, the first magnetic member  51  and the first counter magnetic member  51 A function as MFCs (Magnetic Field Concentrators). 
       FIG. 2  is a schematic view illustrating a magnetic sensor according to the first embodiment. 
     As shown in  FIG. 2 , the magnetic sensor  110   a  may include an element current circuit  75 . The element current circuit  75  is configured to supply an element current Id to the first magnetic element  11 E. For example, the element current circuit  75  is configured to supply the element current Id between the first end portion  11 Ee and the first other-end portion  11 Ef of the first magnetic element  11 E. For example, the element current circuit  75  is included in a circuit part  70 . The circuit part  70  may be configured to detect the electrical resistance of the first magnetic element  11 E based on the element current Id. The electrical resistance of the first magnetic element  11 E changes according to the magnetic field of a detection object. For example, the orientation of the magnetization of the first magnetic layer  11  changes according to the magnetic field of the detection object. For example, the first magnetic layer  11  is a free magnetic layer. 
       FIGS. 3A to 3C  are schematic views illustrating the magnetic sensor according to the first embodiment.  FIG. 3A  is a plan view.  FIG. 3B  is a line Y 1 -Y 2  cross-sectional view of  FIG. 3A .  FIG. 3C  is a line X 1 -X 2  cross-sectional view of  FIG. 3A . 
     As shown in  FIGS. 3A and 3C , the magnetic sensor  110   a  according to the embodiment includes a conductive member  20 . Otherwise, the configuration of the magnetic sensor  110   a  may be similar to the configuration of the magnetic sensor  110 . 
     In the magnetic sensor  110   a , the conductive member  20  includes a first corresponding portion  21 . The first corresponding portion  21  is along the first magnetic element  11 E. For example, the first corresponding portion  21  overlaps the first magnetic element  11 E in a direction that crosses the second direction (the Y-axis direction). For example, the first corresponding portion  21  overlaps the first magnetic element  11 E in the Z-axis direction. The positions in the Z-axis direction of the first magnetic element  11 E, the first corresponding portion  21 , the first magnetic member  51 , and the first counter magnetic member  51 A are arbitrary. A magnetic field (a current magnetic field) that is based on a current supplied to the first corresponding portion  21  is applied to the first magnetic element  11 E. By using a current magnetic field of an alternating current as described below, it is possible to suppress noise and detect with higher sensitivity. 
       FIG. 4  is a schematic view illustrating the magnetic sensor according to the first embodiment. 
     As shown in  FIG. 4 , the first magnetic element  11 E includes the first end portion  11 Ee and the first other-end portion  11 Ef as described above. The direction from the first end portion  11 Ee toward the first other-end portion  11 Ef is along the second direction (the Y-axis direction). The first corresponding portion  21  includes a first portion  21   e  and a first other-portion  21   f . The first portion  21   e  corresponds to the first end portion  11 Ee. The first other-portion  21   f  corresponds to the first other-end portion  11 Ef. For example, the first portion  21   e  overlaps the first end portion  11 Ee in the first direction (the Z-axis direction). For example, the first other-portion  21   f  overlaps the first other-end portion  11 Ef in the first direction. 
     The magnetic sensor  110   a  may include the element current circuit  75  and a first current circuit  71 . As described above, the element current circuit  75  is configured to supply the element current Id between the first end portion  11 Ee and the first other-end portion  11 Ef of the first magnetic element  11 E. The first current circuit  71  is configured to supply a first current I 1  that includes an alternating current component to the first corresponding portion  21 . The first current circuit  71  is configured to supply the first current I 1  between the first portion  21   e  and the first other-portion  21   f . The first current circuit  71  may be included in the circuit part  70 . An example of the detection using the first current I 1  that includes the alternating current component is described below. 
     Second Embodiment 
       FIGS. 5A to 5C  are schematic views illustrating a magnetic sensor according to a second embodiment.  FIG. 5A  is a plan view.  FIG. 5B  is a line Y 1 -Y 2  cross-sectional view of  FIG. 5A .  FIG. 5C  is a line X 1 -X 2  cross-sectional view of  FIG. 5A . 
     As shown in  FIGS. 5A to 5C , the magnetic sensor  111  according to the embodiment includes the sensor part  10 A. 
     In the magnetic sensor  111  as shown in  FIGS. 5A and 5B , the first sensor part  10 A includes the first magnetic element  11 E, a first stacked magnetic layer  11   s L, and a first counter stacked magnetic layer  11   os L. The first stacked magnetic layer  11   s L and the first counter stacked magnetic layer  11   os L include, for example, at least one selected from the group consisting of IrMn and PtMn. 
     The first magnetic element  11 E includes the first magnetic layer  11 , the first counter magnetic layer  110 , the first intermediate magnetic layer  11   i , the first nonmagnetic layer  11   n , and the first intermediate nonmagnetic layer  11   in . The direction from the first magnetic layer  11  toward the first counter magnetic layer  110  is along the first direction (the Z-axis direction). The first intermediate magnetic layer  11   i  is located between the first magnetic layer  11  and the first counter magnetic layer  110 . The first nonmagnetic layer  11   n  is located between the first magnetic layer  11  and the first intermediate magnetic layer  11   i . The first intermediate nonmagnetic layer  11   in  is located between the first intermediate magnetic layer  11   i  and the first counter magnetic layer  110 . 
     The direction from the first stacked magnetic layer  11   s L toward the first counter stacked magnetic layer  11   os L is along the second direction that crosses the first direction. The second direction is, for example, the Y-axis direction. A portion  11   op  of the first counter magnetic layer  110  is between the first magnetic layer  11  and the first stacked magnetic layer  11   s L. For example, the portion  11   op  of the first counter magnetic layer  110  is between the first intermediate nonmagnetic layer  11   in  and the first stacked magnetic layer  11   s L. Another portion  11   oq  of the first counter magnetic layer  110  is between the first magnetic layer  11  and the first counter stacked magnetic layer  11   os L. For example, the other portion  11   oq  of the first counter magnetic layer  110  is between the first intermediate nonmagnetic layer  11   in  and the first counter stacked magnetic layer  11   os L. 
     For example, the magnetization of the first counter magnetic layer  110  is made uniform by the first stacked magnetic layer  11   s L and the first counter stacked magnetic layer  11   os L. For example, the magnetization at the end portion in the Y-axis direction of the first counter magnetic layer  110  is controlled by the first stacked magnetic layer  11   s L and the first counter stacked magnetic layer  11   os L. By making the magnetization of the first counter magnetic layer  110  uniform, for example, the magnetization of the first intermediate magnetic layer  11   i  is made uniform. A magnetic sensor can be provided in which the sensitivity can be increased. 
     For example, the first stacked magnetic layer  11   s L may contact the portion  11   op  of the first counter magnetic layer  110 . Or, the distance along the first direction (the Z-axis direction) between the first stacked magnetic layer  11   s L and the portion  11   op  of the first counter magnetic layer  110  is, for example, not more than 0.1 times the thickness of the first counter magnetic layer  110 . The thickness of the first counter magnetic layer  110  is the length along the first direction (the Z-axis direction) of the first counter magnetic layer  110 . For example, the first counter stacked magnetic layer  11   os L contacts the other portion  11   oq  of the first counter magnetic layer  110 . Or, the distance along the first direction between the first counter stacked magnetic layer  11   os L and the other portion  11   oq  of the first counter magnetic layer  110  is not more than 0.1 times the thickness of the first counter magnetic layer  110 . Thereby, the magnetization of the first counter magnetic layer  110  is easily stabilized by the first stacked magnetic layer  11   s L and the first counter stacked magnetic layer  11   os L. 
     As shown in  FIG. 5A , the length along the second direction (the Y-axis direction) of the first stacked magnetic layer  11   s L is taken as a length La 1 . The length La 1  is, for example, not less than 0.01 times and not more than 0.1 times the length (the first length L 1 ) along the second direction of the first magnetic element  11 E. The length along the second direction of the first counter stacked magnetic layer  11   os L is taken as a length Lb 1 . The length Lb 1  is, for example, not less than 0.01 times and not more than 0.1 times the length (the first length L 1 ) along the second direction of the first magnetic element  11 E. For example, the magnetization of the first counter magnetic layer  110  is favorably controlled by such a length La 1  and such a length Lb 1 . 
     The configuration and materials of the magnetic sensor  110  described above are applicable to the magnetic sensor  111 . For example, the magnetic sensor  111  may include the first magnetic member  51  and the first counter magnetic member  51 A. According to the second embodiment as described below, the conductive member  20  described with reference to the magnetic sensor  110   a  may be included. 
       FIGS. 6A to 6C  are schematic views illustrating a magnetic sensor according to the second embodiment.  FIG. 6A  is a plan view.  FIG. 6B  is a line Y 1 -Y 2  cross-sectional view of  FIG. 6A .  FIG. 6C  is a line X 1 -X 2  cross-sectional view of  FIG. 6A . 
     As shown in  FIGS. 6A and 6C , the magnetic sensor  111   a  according to the embodiment includes the conductive member  20 . Otherwise, the configuration of the magnetic sensor  111   a  may be similar to the configuration of the magnetic sensor  111 . 
     In the magnetic sensor  111   a , the conductive member  20  includes the first corresponding portion  21 . The first corresponding portion  21  is along the first magnetic element  11 E. For example, the first corresponding portion  21  overlaps the first magnetic element  11 E in a direction that crosses the second direction (the Y-axis direction). For example, the first corresponding portion  21  overlaps the first magnetic element  11 E in the Z-axis direction. The positions in the Z-axis direction of the first magnetic element  11 E, the first corresponding portion  21 , the first magnetic member  51 , and the first counter magnetic member  51 A are arbitrary. A magnetic field (a current magnetic field) that is based on a current supplied to the first corresponding portion  21  is applied to the first magnetic element  11 E. As described below, for example, by using a current magnetic field of an alternating current, it is possible to suppress noise and detect with higher sensitivity. 
     The magnetic sensor  111   a  also may include the element current circuit  75  and the first current circuit  71  (referring to  FIG. 4 ). As described above, the element current circuit  75  is configured to supply the element current Id between the first end portion  11 Ee and the first other-end portion  11 Ef of the first magnetic element  11 E. The first current circuit  71  is configured to supply the first current I 1  that includes the alternating current component to the first corresponding portion  21 . The first current circuit  71  is configured to supply the first current I 1  between the first portion  21   e  and the first other-portion  21   f . As described below, the electrical resistance of the first magnetic element  11 E has an even-function characteristic. It is possible to detect with suppressed noise by using the even-function electrical resistance and the first current I 1  that includes the alternating current component. 
     An example of characteristics of the first magnetic element  11 E will now be described. The following description is applicable to the magnetic sensors according to the first and second embodiments. 
       FIGS. 7A and 7B  are schematic views illustrating characteristics of the magnetic sensor according to the embodiment. 
     In these figures, the horizontal axis corresponds to the value of the current (e.g., the first current I 1 ) flowing in the conductive member  20  (e.g., the first corresponding portion  21 ). The vertical axis is an electrical resistance Rx of the first magnetic element  11 E. According to the embodiment as shown in  FIGS. 7A and 7B , the electrical resistance Rx has an even-function characteristic with respect to the change of the current (the first current I 1 ). 
     For example, the electrical resistance Rx of the first magnetic element  11 E has a first value R 1  when a first-value current Ia 1  is supplied to the first corresponding portion  21 . The electrical resistance Rx has a second value R 2  when a second-value current Ia 2  is supplied to the first corresponding portion  21 . The electrical resistance Rx has a third value R 3  when a third-value current Ia 3  is supplied to the first corresponding portion  21 . The absolute value of the first-value current Ia 1  is less than the absolute value of the second-value current Ia 2  and less than the absolute value of the third-value current Ia 3 . For example, the first-value current Ia 1  may be substantially 0. The orientation of the second-value current Ia 2  is opposite to the orientation of the third-value current Ia 3 . 
     In the example of  FIG. 7A , the first value R 1  is less than the second value R 2  and less than the third value R 3 . In the example of  FIG. 7B , the first value R 1  is greater than the second value R 2  and greater than the third value R 3 . 
     For example, the electrical resistance Rx has a fourth value R 4  when a current does not flow in the first corresponding portion  21 . For example, the first value R 1  is substantially equal to the fourth value R 4  when the current does not flow. For example, the ratio of the absolute value of the difference between the first value R 1  and the fourth value R 4  to the fourth value R 4  is not more than 0.01. The ratio may be not more than 0.001. A substantially even-function characteristic is obtained for the positive and negative currents. 
     Such a relationship between the first current I 1  and the electrical resistance Rx is based on the magnetic field due to the first current I 1  being applied to the first magnetic element  11 E and based on the electrical resistance Rx of the first magnetic element  11 E changing according to the intensity of the magnetic field. 
     Similarly to the example shown in  FIG. 7A  or  FIG. 7B , the electrical resistance Rx also has an even-function characteristic when an external magnetic field is applied to the first magnetic element  11 E. The external magnetic field includes, for example, a component along the X-axis direction. 
       FIGS. 8A and 8B  are schematic views illustrating characteristics of the magnetic sensor according to the embodiment. 
     In these figures, the horizontal axis is the intensity of an external magnetic field Hex that is applied to the first magnetic element  11 E. The vertical axis is the electrical resistance Rx of the first magnetic element  11 E. These figures correspond to the R-H characteristic. As shown in  FIGS. 8A and 8B , the electrical resistance Rx has an even-function characteristic with respect to the external magnetic field Hex applied to the first magnetic element  11 E. The external magnetic field Hex includes, for example, an X-axis direction component. 
     As shown in  FIGS. 8A and 8B , the electrical resistance Rx of the first magnetic element  11 E has the first value R 1  when a first magnetic field Hex 1  is applied to the first magnetic element  11 E. The electrical resistance Rx has the second value R 2  when a second magnetic field Hex 2  is applied to the first magnetic element  11 E. The electrical resistance Rx has the third value R 3  when a third magnetic field Hex 3  is applied to the first magnetic element  11 E. The absolute value of the first magnetic field Hex 1  is less than the absolute value of the second magnetic field Hex 2  and less than the absolute value of the third magnetic field Hex 3 . The orientation of the second magnetic field Hex 2  is opposite to the orientation of the third magnetic field Hex 3 . 
     In the example of  FIG. 8A , the first value R 1  is less than the second value R 2  and less than the third value R 3 . In the example of  FIG. 8B , the first value R 1  is greater than the second value R 2  and greater than the third value R 3 . For example, the electrical resistance Rx has the fourth value R 4  when the external magnetic field is not applied to the first magnetic element  11 E. The first value R 1  is substantially equal to the fourth value R 4  when the external magnetic field is not applied. For example, the ratio of the absolute value of the difference between the first value R 1  and the fourth value R 4  to the fourth value R 4  is not more than 0.01. The ratio may be not more than 0.001. A substantially even-function characteristic is obtained for the positive and negative external magnetic fields. 
     By utilizing such an even-function characteristic, highly-sensitive detection is possible as follows. 
     An example will now be described in which the first current I 1  is an alternating current and substantially does not include a direct current component. The first current I 1  (the alternating current) is supplied to the first corresponding portion  21 ; and an alternating magnetic field due to the alternating current is applied to the first magnetic element  11 E. An example of the change of the electrical resistance Rx at this time will be described. 
       FIGS. 9A to 9C  are graphs illustrating characteristics of the magnetic sensor according to the embodiment. 
       FIG. 9A  shows characteristics when a signal magnetic field Hsig (an external magnetic field) applied to the first magnetic element  11 E is 0.  FIG. 9B  shows characteristics when the signal magnetic field Hsig is positive.  FIG. 9C  shows characteristics when the signal magnetic field Hsig is negative. These figures show the relationship between a magnetic field H and a resistance R (corresponding to the electrical resistance Rx). 
     As shown in  FIG. 9A , when the signal magnetic field Hsig is 0, the resistance R has a characteristic that is symmetric with respect to the positive and negative magnetic field H. In the example, when an alternating magnetic field Hac is zero, the resistance R is a low resistance Ro. For example, the magnetization of the free magnetic layer is rotated substantially identically to the positive and negative magnetic field H. Therefore, a symmetric resistance change is obtained. The change of the resistance R with respect to the alternating magnetic field Hac has the same value between the positive and negative polarities. The period of the change of the resistance R is ½ times the period of the alternating magnetic field Hac. The change of the resistance R substantially does not include the frequency component of the alternating magnetic field Hac. 
     As shown in  FIG. 9B , the characteristic of the resistance R shifts to the positive magnetic field H side when a positive signal magnetic field Hsig is applied. For example, the resistance R becomes high for the alternating magnetic field Hac on the positive side. The resistance R becomes low for the alternating magnetic field Hac on the negative side. 
     As shown in  FIG. 9C , the characteristic of the resistance R shifts to the negative magnetic field H side when a negative signal magnetic field Hsig is applied. For example, the resistance R becomes low for the alternating magnetic field Hac on the positive side. The resistance R becomes high for the alternating magnetic field Hac on the negative side. 
     Change in the resistance R is different for the positive and negative of the alternating magnetic field Hac when a signal magnetic field Hsig with non-zero magnitude is applied. The period of the change of the resistance R with respect to the positive and negative of the alternating magnetic field Hac is equal to the period of the alternating magnetic field Hac. An output voltage that has an alternating current frequency component corresponding to the signal magnetic field Hsig is generated. 
     The characteristics described above are obtained in the case where the signal magnetic field Hsig does not temporally change. The case where the signal magnetic field Hsig temporally changes is as follows. The frequency of the signal magnetic field Hsig is taken as a signal frequency fsig. The frequency of the alternating magnetic field Hac is taken as an alternating current frequency fac. In such a case, an output that corresponds to the signal magnetic field Hsig is generated at the frequency of fac±fsig. 
     In the case where the signal magnetic field Hsig temporally changes, the signal frequency fsig is, for example, not more than 1 kHz. On the other hand, the alternating current frequency fac is sufficiently greater than the signal frequency fsig. For example, the alternating current frequency fac is not less than 10 times the signal frequency fsig. 
     For example, the signal magnetic field Hsig can be detected with high accuracy by extracting an output voltage having the same period (frequency) component (alternating current frequency component) as the period (the frequency) of the alternating magnetic field Hac. In the magnetic sensor according to the embodiment, the external magnetic field Hex (the signal magnetic field Hsig) that is the detection object can be detected with high sensitivity by utilizing such characteristics. According to the embodiment, the external magnetic field Hex (the signal magnetic field Hsig) and the alternating magnetic field Hac due to the first current I 1  can be efficiently applied to the first magnetic element  11 E by the magnetic member  51 . High sensitivity is obtained. 
     Third Embodiment 
     According to a third embodiment, the magnetic sensor includes multiple magnetic elements. 
       FIGS. 10 and 11  are schematic views illustrating the magnetic sensor according to the third embodiment. 
       FIGS. 12A to 12C  are schematic cross-sectional views illustrating the magnetic sensor according to the third embodiment. 
       FIGS. 13A to 13C  are schematic plan views illustrating the magnetic sensor according to the third embodiment. 
     As shown in  FIG. 10 , the magnetic sensor  112  according to the embodiment includes a second sensor part  10 B, a third sensor part  10 C, and a fourth sensor part  10 D in addition to the first sensor part  10 A. The second sensor part  10 B includes a second magnetic element  12 E. The third sensor part  10 C includes a third magnetic element  13 E. The fourth sensor part  10 D includes a fourth magnetic element  14 E. 
     The first magnetic element  11 E includes the first end portion  11 Ee and the first other-end portion  11 Ef. The direction from the first end portion  11 Ee toward the first other-end portion  11 Ef is along the second direction (e.g., the Y-axis direction). The second magnetic element  12 E includes a second end portion  12 Ee and a second other-end portion  12 Ef. The direction from the second end portion  12 Ee toward the second other-end portion  12 Ef is along the second direction. The third magnetic element  13 E includes a third end portion  13 Ee and a third other-end portion  13 Ef. The direction from the third end portion  13 Ee toward the third other-end portion  13 Ef is along the second direction. The fourth magnetic element  14 E includes a fourth end portion  14 Ee and a fourth other-end portion  14 Ef. The direction from the fourth end portion  14 Ee toward the fourth other-end portion  14 Ef is along the second direction. 
     For example, the first other-end portion  11 Ef is electrically connected with the second end portion  12 Ee. The first end portion  11 Ee is electrically connected with the third end portion  13 Ee. The third other-end portion  13 Ef is electrically connected with the fourth end portion  14 Ee. The second other-end portion  12 Ef is electrically connected with the fourth other-end portion  14 Ef. For example, the first to fourth magnetic elements  11 E to  14 E have a bridge connection. 
     The element current circuit  75  is configured to supply an element current to the first magnetic element  11 E, the second magnetic element  12 E, the third magnetic element  13 E, and the fourth magnetic element  14 E. In the example, the element current circuit  75  is configured to supply the element current Id between a first connection point CP 1  and a second connection point CP 2 , in which the first connection point CP 1  is between the first end portion  11 Ee and the third end portion  13 Ee, and the second connection point CP 2  is between the second other-end portion  12 Ef and the fourth other-end portion  14 Ef. 
     As shown in  FIG. 10 , the magnetic sensor  112  may include a detection circuit  73 . The detection circuit  73  may be included in the circuit part  70 . The detection circuit  73  is configured to detect the change of the potential between a third connection point CP 3  and a fourth connection point CP 4 , in which the third connection point CP 3  is between the first other-end portion  11 Ef and the second end portion  12 Ee, and the fourth connection point CP 4  is between the third other-end portion  13 Ef and the fourth end portion  14 Ee. By using a bridge circuit that includes multiple magnetic elements, the noise can be further suppressed. Detection with higher sensitivity is possible. 
     As shown in  FIG. 11 , the conductive member  20  includes a second corresponding portion  22 , a third corresponding portion  23 , and a fourth corresponding portion  24  in addition to the first corresponding portion  21 . The second corresponding portion  22  is along the second magnetic element  12 E. The third corresponding portion  23  is along the third magnetic element  13 E. The fourth corresponding portion  24  is along the fourth magnetic element  14 E. 
     For example, the second corresponding portion  22  overlaps the second magnetic element  12 E in the Z-axis direction (referring to  FIG. 12A ). For example, the third corresponding portion  23  overlaps the third magnetic element  13 E in the Z-axis direction (referring to  FIG. 12B ). For example, the fourth corresponding portion  24  overlaps the fourth magnetic element  14 E in the Z-axis direction (referring to  FIG. 12C ). 
     As shown in  FIG. 11 , for example, the first corresponding portion  21  includes the first portion  21   e  that corresponds to the first end portion  11 Ee, and the first other-portion  21   f  that corresponds to the first other-end portion  11 Ef. For example, the first portion  21   e  overlaps the first end portion  11 Ee in the Z-axis direction. The first other-portion  21   f  overlaps the first other-end portion  11 Ef in the Z-axis direction. 
     As shown in  FIG. 11 , for example, the second corresponding portion  22  includes a second portion  22   e  that corresponds to the second end portion  12 Ee, and a second other-portion  22   f  that corresponds to the second other-end portion  12 Ef. For example, the second portion  22   e  overlaps the second end portion  12 Ee in the Z-axis direction. The second other-portion  22   f  overlaps the second other-end portion  12 Ef in the Z-axis direction. 
     As shown in  FIG. 11 , for example, the third corresponding portion  23  includes a third portion  23   e  that corresponds to the third end portion  13 Ee, and a third other-portion  23   f  that corresponds to the third other-end portion  13 Ef. For example, the third portion  23   e  overlaps the third end portion  13 Ee in the Z-axis direction. The third other-portion  23   f  overlaps the third other-end portion  13 Ef in the Z-axis direction. 
     As shown in  FIG. 11 , for example, the fourth corresponding portion  24  includes a fourth portion  24   e  that corresponds to the fourth end portion  14 Ee, and a fourth other-portion  24   f  that corresponds to the fourth other-end portion  14 Ef. For example, the fourth portion  24   e  overlaps the fourth end portion  14 Ee in the Z-axis direction. The fourth other-portion  24   f  overlaps the fourth other-end portion  14 Ef in the Z-axis direction. 
     The first current circuit  71  is configured to supply the first current I 1  that includes the alternating current component to the first corresponding portion  21 , the second corresponding portion  22 , the third corresponding portion  23 , and the fourth corresponding portion  24 . 
     In the example, the first portion  21   e  is electrically connected with the third portion  23   e . The first other-portion  21   f  is electrically connected with the second portion  22   e . The third other-portion  23   f  is electrically connected with the fourth portion  24   e . The second other-portion  22   f  is electrically connected with the fourth other-portion  24   f . In the example, the first current circuit  71  is configured to supply the first current I 1  that includes the alternating current component between a fifth connection point CP 5  and a sixth connection point CP 6 , in which the fifth connection point CP 5  is between the first other-portion  21   f  and the second portion  22   e , and the sixth connection point CP 6  is between the third other-portion  23   f  and the fourth portion  24   e.    
     One time at which the first current I 1  is supplied to the conductive member  20  is taken as a first time. At the first time, the element current Id flows through the first magnetic element  11 E in the orientation from the first end portion  11 Ee toward the first other-end portion  11 Ef. At the first time, the element current Id flows through the second magnetic element  12 E in the orientation from the second end portion  12 Ee toward the second other-end portion  12 Ef. At the first time, the element current Id flows through the third magnetic element  13 E in the orientation from the third end portion  13 Ee toward the third other-end portion  13 Ef. At the first time, the element current Id flows through the fourth magnetic element  14 E in the orientation from the fourth end portion  14 Ee toward the fourth other-end portion  14 Ef. 
     At the first time, the first current I 1  flows through the first corresponding portion  21  in the orientation from the first other-portion  21   f  toward the first portion  21   e . At the first time, the first current I 1  flows through the second corresponding portion  22  in the orientation from the second portion  22   e  toward the second other-portion  22   f . At the first time, the first current I 1  flows through the third corresponding portion  23  in the orientation from the third portion  23   e  toward the third other-portion  23   f . The first current I 1  flows through the fourth corresponding portion  24  in the orientation from the fourth other-portion  24   f  toward the fourth portion  24   e.    
     The magnetic field that is due to the first current I 1  flowing through the first corresponding portion  21  is applied to the first magnetic element  11 E. The magnetic field that is due to the first current I 1  flowing through the second corresponding portion  22  is applied to the second magnetic element  12 E. The magnetic field that is due to the first current I 1  flowing through the third corresponding portion  23  is applied to the third magnetic element  13 E. The magnetic field that is due to the first current I 1  flowing through the fourth corresponding portion  24  is applied to the fourth magnetic element  14 E. 
     For example, the relationship between the orientation of the element current Id flowing through the second magnetic element  12 E at the first time and the orientation of the first current I 1  flowing through the second corresponding portion  22  at the first time is opposite to (the opposite phase of) the relationship between the orientation of the first current I 1  flowing through the first corresponding portion  21  at the first time and the orientation of the element current Id flowing through the first magnetic element  11 E. The relationship between the orientation of the first current I 1  flowing through the fourth corresponding portion  24  at the first time and the orientation of the element current Id flowing through the fourth magnetic element  14 E is opposite to (the opposite phase of) the relationship between the orientation of the first current I 1  flowing through the third corresponding portion  23  at the first time and the orientation of the element current Id flowing through the third magnetic element  13 E. 
     The noise can be further suppressed by such a current flowing in the multiple magnetic elements that have the bridge connection. 
     As shown in  FIG. 12A , the second magnetic element  12 E includes a second magnetic layer  12 , a second counter magnetic layer  12   o , a second intermediate magnetic layer  12   i , a second nonmagnetic layer  12   n , and a second intermediate nonmagnetic layer  12   in . The direction from the second magnetic layer  12  toward the second counter magnetic layer  12   o  is along the first direction (the Z-axis direction). The second intermediate magnetic layer  12   i  is located between the second magnetic layer  12  and the second counter magnetic layer  12   o . The second nonmagnetic layer  12   n  is located between the second magnetic layer  12  and the second intermediate magnetic layer  12   i . The second intermediate nonmagnetic layer  12   in  is located between the second intermediate magnetic layer  12   i  and the second counter magnetic layer  12   o.    
     As shown in  FIG. 12B , the third magnetic element  13 E includes a third magnetic layer  13 , a third counter magnetic layer  13   o , a third intermediate magnetic layer  13   i , a third nonmagnetic layer  13   n , and a third intermediate nonmagnetic layer  13   in . The direction from the third magnetic layer  13  toward the third counter magnetic layer  13   o  is along the first direction (the Z-axis direction). The third intermediate magnetic layer  13   i  is located between the third magnetic layer  13  and the third counter magnetic layer  13   o . The third nonmagnetic layer  13   n  is located between the third magnetic layer  13  and the third intermediate magnetic layer  13   i . The third intermediate nonmagnetic layer  13   in  is located between the third intermediate magnetic layer  13   i  and the third counter magnetic layer  13   o.    
     As shown in  FIG. 12C , the fourth magnetic element  14 E includes a fourth magnetic layer  14 , a fourth counter magnetic layer  14   o , a fourth intermediate magnetic layer  14   i , a fourth nonmagnetic layer  14   n , and a fourth intermediate nonmagnetic layer  14   in . The direction from the fourth magnetic layer  14  toward the fourth counter magnetic layer  14   o  is along the first direction (the Z-axis direction). The fourth intermediate magnetic layer  14   i  is located between the fourth magnetic layer  14  and the fourth counter magnetic layer  14   o . The fourth nonmagnetic layer  14   n  is located between the fourth magnetic layer  14  and the fourth intermediate magnetic layer  14   i . The fourth intermediate nonmagnetic layer  14 in is located between the fourth intermediate magnetic layer  14   i  and the fourth counter magnetic layer  14   o.    
     As shown in  FIG. 12A , the second sensor part  10 B may further include a second magnetic member  52  and a second counter magnetic member  52 A. The direction from the second magnetic member  52  toward the second counter magnetic member  52 A is along the third direction (e.g., the X-axis direction). The second magnetic element  12 E overlaps a region  66   b  between the second magnetic member  52  and the second counter magnetic member  52 A in the first direction (the Z-axis direction). The region  66   b  may be, for example, a portion of the insulating member  65 . For example, a portion of the second magnetic element  12 E overlaps a portion of the second magnetic member  52  in the first direction. Another portion of the second magnetic element  12 E overlaps a portion of the second counter magnetic member  52 A in the first direction. 
     As shown in  FIG. 12B , the third sensor part  10 C may further include a third magnetic member  53  and a third counter magnetic member  53 A. The direction from the third magnetic member  53  toward the third counter magnetic member  53 A is along the third direction (e.g., the X-axis direction). The third magnetic element  13 E overlaps a region  66   c  between the third magnetic member  53  and the third counter magnetic member  53 A in the first direction (the Z-axis direction). The region  66   c  may be, for example, a portion of the insulating member  65 . For example, a portion of the third magnetic element  13 E overlaps a portion of the third magnetic member  53  in the first direction. Another portion of the third magnetic element  13 E overlaps a portion of the third counter magnetic member  53 A in the first direction. 
     As shown in  FIG. 12C , the fourth sensor part  10 D may further include a fourth magnetic member  54  and a fourth counter magnetic member  54 A. The direction from the fourth magnetic member  54  toward the fourth counter magnetic member  54 A is along the third direction (e.g., the X-axis direction). The fourth magnetic element  14 E overlaps a region  66   d  between the fourth magnetic member  54  and the fourth counter magnetic member  54 A in the first direction (the Z-axis direction). The region  66   d  may be, for example, a portion of the insulating member  65 . For example, a portion of the fourth magnetic element  14 E overlaps a portion of the fourth magnetic member  54  in the first direction. Another portion of the fourth magnetic element  14 E overlaps a portion of the fourth counter magnetic member  54 A in the first direction. 
     As shown in  FIG. 13A , the length along the second direction (the Y-axis direction) of the second magnetic element  12 E is taken as a second length L 2 . The length along the third direction (e.g., the X-axis direction) of the second magnetic element  12 E is taken as a second width w 2 . For example, the second length L 2  is greater than the second width w 2 . For example, the magnetization of the magnetic layer included in the second magnetic element  12 E is along the Y-axis direction. 
     As shown in  FIG. 13B , the length along the second direction (the Y-axis direction) of the third magnetic element  13 E is taken as a third length L 3 . The length along the third direction (e.g., the X-axis direction) of the third magnetic element  13 E is taken as a third width w 3 . For example, the third length L 3  is greater than the third width w 3 . For example, the magnetization of the magnetic layer included in the third magnetic element  13 E is along the Y-axis direction. 
     As shown in  FIG. 13C , the length along the second direction (the Y-axis direction) of the fourth magnetic element  14 E is taken as a fourth length L 4 . The length along the third direction (e.g., the X-axis direction) of the fourth magnetic element  14 E is taken as a fourth width w 4 . For example, the fourth length L 4  is greater than the fourth width w 4 . For example, the magnetization of the magnetic layer included in the fourth magnetic element  14 E is along the Y-axis direction. 
     The configurations (including the materials) of the second magnetic layer  12 , the third magnetic layer  13 , and the fourth magnetic layer  14  may be similar to the configuration (including the material) of the first magnetic layer  11 . The configurations (including the materials) of the second counter magnetic layer  12   o , the third counter magnetic layer  13   o , and the fourth counter magnetic layer  14   o  may be similar to the configuration (including the material) of the first counter magnetic layer  110 . The configurations (including the materials) of the second intermediate magnetic layer  12   i , the third intermediate magnetic layer  13   i , and the fourth intermediate magnetic layer  14   i  may be similar to the configuration (including the material) of the first intermediate magnetic layer  11   i . The configurations (including the materials) of the second nonmagnetic layer  12   n , the third nonmagnetic layer  13   n , and the fourth nonmagnetic layer  14   n  may be similar to the configuration (including the material) of the first nonmagnetic layer  11   n . The configurations (including the materials) of the second intermediate nonmagnetic layer  12   in , the third intermediate nonmagnetic layer  13   in , and the fourth intermediate nonmagnetic layer  14 in may be similar to the configuration (including the material) of the first intermediate nonmagnetic layer  11   in.    
     At least one of the second sensor part  10 B, the third sensor part  10 C, or the fourth sensor part  10 D may include magnetic parts similar to the first side magnetic part  11 S and the first counter side magnetic part  11 SA described with reference to the first sensor part  10 A. At least one of the second sensor part  10 B, the third sensor part  10 C, or the fourth sensor part  10 D may include stacked magnetic layers similar to the first stacked magnetic layer  11   s L and the first counter stacked magnetic layer  11   os L described with reference to the first sensor part  10 A. 
       FIGS. 14A to 14C  are schematic views illustrating magnetic sensors according to the third embodiment. 
     The configurations of magnetic sensors  112   a  to  112   c  illustrated in  FIGS. 14A to 14C  may be combined with the configuration of the magnetic sensor  112  illustrated in  FIG. 10 . 
     In the magnetic sensor  112   a  as shown in  FIG. 14A , the first portion  21   e  is electrically connected with the second other-portion  22   f . The first other-portion  21   f  is electrically connected with the fourth portion  24   e . The third portion  23   e  is electrically connected with the fourth other-portion  24   f . The third other-portion  23   f  is electrically connected with the second portion  22   e.    
     In the magnetic sensor  112   a , the first current circuit  71  is configured to supply the first current I 1  between a seventh connection point CP 7  and an eighth connection point CP 8 , in which the seventh connection point CP 7  is between the first portion  21   e  and the second other-portion  22   f , and the eighth connection point CP 8  is between the third portion  23   e  and the fourth other-portion  24   f.    
     At one time (the first time) in the magnetic sensor  112   a , the first current I 1  has the orientation from the first other-portion  21   f  toward the first portion  21   e , the orientation from the second portion  22   e  toward the second other-portion  22   f , the orientation from the third portion  23   e  toward the third other-portion  23   f , and the orientation from the fourth other-portion  24   f  toward the fourth portion  24   e.    
     In the magnetic sensor  112   b  as shown in  FIG. 14B , the first other-portion  21   f  is electrically connected with the fourth portion  24   e . The third other-portion  23   f  is electrically connected with the second portion  22   e . The second other-portion  22   f  is electrically connected with the fourth other-portion  24   f.    
     In the magnetic sensor  112   b , the first current circuit  71  is configured to supply the first current I 1  between the first portion  21   e  and the third portion  23   e.    
     At one time (the first time) in the magnetic sensor  112   b , the first current I 1  has the orientation from the first other-portion  21   f  toward the first portion  21   e , the orientation from the second portion  22   e  toward the second other-portion  22   f , the orientation from the third portion  23   e  toward the third other-portion  23   f , and the orientation from the fourth other-portion  24   f  toward the fourth portion  24   e.    
     In the magnetic sensor  112   c  as shown in  FIG. 14C , the first portion  21   e  is electrically connected with the second other-portion  22   f , the third other-portion  23   f , and the fourth portion  24   e . The first other-portion  21   f  is electrically connected with the second portion  22   e , the third portion  23   e , and the fourth other-portion  24   f.    
     In the magnetic sensor  112   c , the first current circuit  71  is configured to supply the first current I 1  that includes the alternating current between a ninth connection point CP 9  and a tenth connection point CP 10 , in which the ninth connection point CP 9  is between the first portion  21   e , the second other-portion  22   f , the third other-portion  23   f , and the fourth portion  24   e , and the tenth connection point CP 10  is between the first other-portion  21   f , the second portion  22   e , the third portion  23   e , and the fourth other-portion  24   f.    
     At one time (the first time) in the magnetic sensor  112   c , the first current I 1  has the orientation from the first other-portion  21   f  toward the first portion  21   e , the orientation from the second portion  22   e  toward the second other-portion  22   f , the orientation from the third portion  23   e  toward the third other-portion  23   f , and the orientation from the fourth other-portion  24   f  toward the fourth portion  24   e.    
     In the magnetic sensors  112   a  to  112   c  as well, it is possible to suppress noise and detect with high sensitivity. 
       FIGS. 15A and 15B  are schematic views illustrating a magnetic sensor according to the third embodiment. 
     As shown in  FIG. 15A , the magnetic sensor  113  according to the embodiment includes the first magnetic element  11 E, the second magnetic element  12 E, a first resistance element  11 R, and a second resistance element  12 R. Otherwise, the configuration of the magnetic sensor  113  may be, for example, the same as the magnetic sensor  110 , etc. 
     The first magnetic element  11 E includes the first end portion  11 Ee and the first other-end portion  11 Ef. The direction from the first end portion  11 Ee toward the first other-end portion  11 Ef is along the second direction (e.g., the Y-axis direction). The second magnetic element  12 E includes the second end portion  12 Ee and the second other-end portion  12 Ef. The direction from the second end portion  12 Ee toward the second other-end portion  12 Ef is along the second direction. The first resistance element  11 R includes the third end portion  13 Ee and the third other-end portion  13 Ef. The direction from the third end portion  13 Ee toward the third other-end portion  13 Ef is along the second direction. The second resistance element  12 R includes the fourth end portion  14 Ee and the fourth other-end portion  14 Ef. The direction from the fourth end portion  14 Ee toward the fourth other-end portion  14 Ef is along the second direction. 
     The conductive member  20  includes the first corresponding portion  21  and the second corresponding portion  22 . The first corresponding portion  21  is along the first magnetic element  11 E. The second corresponding portion  22  is along the second magnetic element  12 E. 
     The first corresponding portion  21  includes the first portion  21   e  that corresponds to the first end portion  11 Ee, and the first other-portion  21   f  that corresponds to the first other-end portion  11 Ef. The second corresponding portion  22  includes the second portion  22   e  that corresponds to the second end portion  12 Ee, and the second other-portion  22   f  that corresponds to the second other-end portion  12 Ef. 
     In the magnetic sensor  113 , the first end portion  11 Ee of the first magnetic element  11 E is electrically connected with the third end portion  13 Ee of the first resistance element  11 R. The first other-end portion  11 Ef of the first magnetic element  11 E is electrically connected with the second end portion  12 Ee of the second magnetic element  12 E. The third other-end portion  13 Ef of the first resistance element  11 R is electrically connected with the fourth end portion  14 Ee of the second resistance element  12 R. The second other-end portion  12 Ef of the second magnetic element  12 E is electrically connected with the fourth other-end portion  14 Ef of the second resistance element  12 R. 
     The element current circuit  75  is configured to supply the element current Id between the first connection point CP 1  and the second connection point CP 2 , in which the first connection point CP 1  is between the first end portion  11 Ee and the third end portion  13 Ee, and the second connection point CP 2  is between the second other-end portion  12 Ef and the fourth other-end portion  14 Ef. 
     The detection circuit  73  is configured to detect the change of the potential between the third connection point CP 3  and the fourth connection point CP 4 , in which the third connection point CP 3  is between the first other-end portion  11 Ef and the second end portion  12 Ee, and the fourth connection point CP 4  is between the third other-end portion  13 Ef and the fourth end portion  14 Ee. 
     As shown in  FIG. 15B , the first other-portion  21   f  is electrically connected with the second portion  22   e . The first portion  21   e  is electrically connected with the second other-portion  22   f . The first current circuit  71  is configured to supply the first current I 1  between the fifth connection point CP 5  and the sixth connection point CP 6 , in which the fifth connection point CP 5  is between the first other-portion  21   f  and the second portion  22   e , and the sixth connection point CP 6  is between the first portion  21   e  and the second other-portion  22   f . In the magnetic sensor  113  as well, it is possible to suppress noise and detect with high sensitivity. 
       FIGS. 16A and 16B  are schematic views illustrating a magnetic sensor according to the third embodiment. 
     As shown in  FIG. 16A , the magnetic sensor  114  according to the embodiment includes the first magnetic element  11 E, the second magnetic element  12 E, the first resistance element  11 R, and the second resistance element  12 R. Otherwise, the configuration of the magnetic sensor  114  may be, for example, the same as the magnetic sensor  110 , etc. 
     In the magnetic sensor  114  as shown in  FIG. 16A , the first end portion  11 Ee of the first magnetic element  11 E is electrically connected with the third end portion  13 Ee of the first resistance element  11 R. The first other-end portion  11 Ef of the first magnetic element  11 E is electrically connected with the fourth end portion  14 Ee of the second resistance element  12 R. The third other-end portion  13 Ef of the first resistance element  11 R is electrically connected with the second end portion  12 Ee of the second magnetic element  12 E. The fourth other-end portion  14 Ef of the second resistance element  12 R is electrically connected with the second other-end portion  12 Ef of the second magnetic element  12 E. 
     The element current circuit  75  is configured to supply the element current Id between the first connection point CP 1  and the second connection point CP 2 , in which the first connection point CP 1  is between the first end portion  11 Ee and the third end portion  13 Ee, and the second connection point CP 2  is between the fourth other-end portion  14 Ef and the second other-end portion  12 Ef. 
     The magnetic sensor  114  may include the detection circuit  73 . The detection circuit  73  is configured to detect the change of the potential between the third connection point CP 3  and the fourth connection point CP 4 , in which the third connection point CP 3  is between the first other-end portion  11 Ef and the fourth end portion  14 Ee, and the fourth connection point CP 4  is between the third other-end portion  13 Ef and the second end portion  12 Ee. 
     As shown in  FIG. 16B , the first portion  21   e  of the first corresponding portion  21  is electrically connected with the second portion  22   e  of the second corresponding portion  22 . The first other-portion  21   f  of the first corresponding portion  21  is electrically connected with the second other-portion  22   f  of the second corresponding portion  22 . 
     The first current circuit  71  is configured to supply the first current I 1  between the fifth connection point CP 5  and the sixth connection point CP 6 , in which the fifth connection point CP 5  is between the first other-portion  21   f  and the second other-portion  22   f , and the sixth connection point CP 6  is between the first portion  21   e  and the second portion  22   e.    
     Fourth Embodiment 
     A fourth embodiment relates to an inspection device. As described below, the inspection device may include a diagnostic device. 
       FIG. 17  is a schematic view illustrating an inspection device according to the fourth embodiment. 
     As shown in  FIG. 17 , the inspection device  550  according to the embodiment includes a processor  78  and the magnetic sensor (in the example of  FIG. 17 , the magnetic sensor  110 ) according to the embodiment. The processor  78  processes an output signal SigX obtained from the magnetic sensor  110 . In the example, the processor  78  includes a sensor control circuit part  75   c , a first lock-in amplifier  75   a , and a second lock-in amplifier  75   b . For example, the first current circuit  71  is controlled by the sensor control circuit part  75   c ; and the first current I 1  that includes the alternating current component is supplied from the first current circuit  71  to a sensor part  10 S. The frequency of the alternating current component of the first current I 1  is, for example, not more than 100 kHz. The element current Id is supplied from the element current circuit  75  to the sensor part  10 S. The sensor part  10 S includes, for example, at least one magnetic element. The change of the potential of the sensor part  10 S is detected by the detection circuit  73 . For example, the output of the detection circuit  73  is the output signal SigX. 
     In the example, the inspection device  550  includes a magnetic field application part  76 A. The magnetic field application part  76 A is configured to apply a magnetic field to a detection object  80 . The detection object  80  is, for example, the inspection object. The detection object  80  includes at least an inspection conductive member  80   c  such as a metal, etc. For example, an eddy current is generated in the inspection conductive member  80   c  when the magnetic field due to the magnetic field application part  76 A is applied to the inspection conductive member  80   c . The state of the eddy current changes when there is a flaw or the like in the inspection conductive member  80   c . The state (e.g., the flaw, etc.) of the inspection conductive member  80   c  can be inspected by the magnetic sensor (e.g., the magnetic sensor  110 , etc.) detecting the magnetic field due to the eddy current. The magnetic field application part  76 A is, for example, an eddy current generator. 
     In the example, the magnetic field application part  76 A includes an application control circuit part  76   a , a drive amplifier  76   b , and a coil  76   c . A current is supplied to the drive amplifier  76   b  by the control by the application control circuit part  76   a . The current is, for example, an alternating current. The frequency of the current is, for example, an eddy current excitation frequency. The eddy current excitation frequency is, for example, not less than 10 Hz and not more than 100 kHz. The eddy current excitation frequency may be, for example, less than 100 kHz. 
     For example, information (which may be, for example, a signal) that relates to the frequency of the alternating current component of the first current I 1  is supplied from the sensor control circuit part  75   c  to the first lock-in amplifier  75   a  as a reference wave (a reference signal). The output of the first lock-in amplifier  75   a  is supplied to the second lock-in amplifier  75   b . Information (which may be, for example, a signal) that relates to the eddy current excitation frequency is supplied from the application control circuit part  76   a  to the second lock-in amplifier  75   b  as a reference wave (a reference signal). The second lock-in amplifier  75   b  is configured to output a signal component corresponding to the eddy current excitation frequency. 
     Thus, for example, the processor  78  includes the first lock-in amplifier  75   a . The output signal SigX that is obtained from the magnetic sensor  110  and a signal SigR 1  that corresponds to the frequency of the alternating current component included in the first current I 1  are input to the first lock-in amplifier  75   a . The first lock-in amplifier  75   a  is configured to output an output signal SigX 1  that uses the signal SigR 1  corresponding to the frequency of the alternating current component included in the first current I 1  as a reference wave (a reference signal). By providing the first lock-in amplifier  75   a , it is possible to suppress noise and detect with high sensitivity. 
     The processor  78  may further include the second lock-in amplifier  75   b . The output signal SigX 1  of the first lock-in amplifier  75   a  and a signal SigR 2  that corresponds to the frequency (the eddy current excitation frequency) of the supply signal (in the example, the magnetic field due to the magnetic field application part  76 A) supplied toward the detection object  80  (the inspection object) are input to the second lock-in amplifier  75   b . The second lock-in amplifier  75   b  is configured to output an output signal SigX 2  that uses the signal SigR 2  corresponding to the frequency of the supply signal supplied toward the detection object  80  (the inspection object) as a reference wave (a reference signal). By providing the second lock-in amplifier  75   b , it is possible to further suppress noise and detect with even higher sensitivity. 
     An abnormality such as a flaw or the like of the inspection conductive member  80   c  of the detection object  80  can be inspected by the inspection device  550 . 
       FIG. 18  is a schematic view illustrating an inspection device according to the fourth embodiment. 
     As shown in  FIG. 18 , the inspection device  551  according to the embodiment includes the processor  78  and the magnetic sensor (e.g., the magnetic sensor  110 ) according to the embodiment. The configurations of the magnetic sensor and the processor  78  of the inspection device  551  may be similar to those of the inspection device  550 . In the example, the inspection device  551  includes a detection object driver  76 B. The detection object driver  76 B is configured to supply a current to the inspection conductive member  80   c  included in the detection object  80 . The inspection conductive member  80   c  is, for example, wiring included in the detection object  80 . A magnetic field that is due to a current  80   i  flowing in the inspection conductive member  80   c  is detected by the magnetic sensor  110 . The inspection conductive member  80   c  can be inspected based on an abnormality due to the detection result of the magnetic sensor  110 . The detection object  80  may be, for example, an electronic device such as a semiconductor device, etc. The detection object  80  may be, for example, a battery, etc. 
     In the example, the detection object driver  76 B includes the application control circuit part  76   a  and the drive amplifier  76   b . The drive amplifier  76   b  is controlled by the application control circuit part  76   a ; and a current is supplied from the drive amplifier  76   b  to the inspection conductive member  80   c . The current is, for example, an alternating current. For example, the alternating current is supplied to the inspection conductive member  80   c . The frequency of the alternating current is, for example, not less than 10 Hz and not more than 100 kHz. The frequency may be, for example, less than 100 kHz. In the example as well, for example, by providing the first lock-in amplifier  75   a  and the second lock-in amplifier  75   b , it is possible to suppress noise and detect with high sensitivity. In one example of the inspection device  551 , multiple magnetic sensors (e.g., the multiple magnetic sensors  110 ) may be provided. The multiple magnetic sensors are, for example, a sensor array. The inspection conductive member  80   c  can be inspected in a short period of time by the sensor array. In one example of the inspection device  551 , the inspection conductive member  80   c  may be inspected by scanning the magnetic sensor (e.g., the magnetic sensor  110 ). 
       FIG. 19  is a schematic perspective view showing an inspection device according to the fourth embodiment. 
     As shown in  FIG. 19 , the inspection device  710  according to the embodiment includes a magnetic sensor  150   a  and a processor  770 . The magnetic sensor  150   a  may be the magnetic sensor according to one of the first to third embodiments or a modification of the magnetic sensor. The processor  770  processes an output signal obtained from the magnetic sensor  150   a . The processor  770  may perform a comparison between a reference value and the signal obtained from the magnetic sensor  150   a , etc. The processor  770  is configured to output an inspection result based on the processing result. 
     For example, an inspection object  680  is inspected by the inspection device  710 . The inspection object  680  is, for example, an electronic device (including a semiconductor circuit, etc.). The inspection object  680  may be, for example, a battery  610 , etc. 
     For example, the magnetic sensor  150   a  according to the embodiment may be used together with the battery  610 . For example, a battery system  600  includes the battery  610  and the magnetic sensor  150   a . The magnetic sensor  150   a  can detect a magnetic field generated by a current flowing in the battery  610 . 
       FIG. 20  is a schematic plan view showing the inspection device according to the fourth embodiment. 
     As shown in  FIG. 20 , the magnetic sensor  150   a  includes, for example, multiple magnetic sensors according to the embodiment. In the example, the magnetic sensor  150   a  includes multiple magnetic sensors (e.g., the magnetic sensor  110 , etc.). For example, the multiple magnetic sensors are arranged along two directions (e.g., the X-axis direction and the Y-axis direction). For example, the multiple magnetic sensors  110  are located on a base body. 
     The magnetic sensor  150   a  can detect a magnetic field generated by a current flowing in the inspection object  680  (which may be, for example, the battery  610 ). For example, an abnormal current flows in the battery  610  when the battery  610  approaches an abnormal state. The change of the state of the battery  610  can be known by the magnetic sensor  150   a  detecting the abnormal current. For example, the entire battery  610  can be inspected in a short period of time by moving the sensor array in two directions while the magnetic sensor  150   a  is proximate to the battery  610 . The magnetic sensor  150   a  may be used to inspect the battery  610  in the manufacturing process of the battery  610 . 
     For example, the magnetic sensor according to the embodiment is applicable to the inspection device  710  such as a diagnostic device, etc.  FIG. 21  is a schematic view showing the magnetic sensor and the inspection device according to the fourth embodiment. 
     As shown in  FIG. 21 , the diagnostic device  500  is an example of the inspection device  710  and includes the magnetic sensor  150 . The magnetic sensor  150  includes the magnetic sensors described in reference to the first to third embodiments and modifications of the magnetic sensors. 
     In the diagnostic device  500 , the magnetic sensor  150  is, for example, a magnetoencephalography device. The magnetoencephalography device detects a magnetic field generated by cranial nerves. When the magnetic sensor  150  is used in a magnetoencephalography device, the size of the magnetic element included in the magnetic sensor  150  is, for example, not less than 1 mm but less than 10 mm. The size is, for example, the length including the MFC. 
     As shown in  FIG. 21 , the magnetic sensor  150  (the magnetoencephalography device) is mounted to, for example, the head of a human body. The magnetic sensor  150  (the magnetoencephalography device) includes a sensor part  301 . The magnetic sensor  150  (the magnetoencephalography device) may include multiple sensor parts  301 . The number of the multiple sensor parts  301  is, for example, about 100 (e.g., not less than 50 and not more than 150). The multiple sensor parts  301  is provided on a flexible base body  302 . 
     The magnetic sensor  150  may include, for example, a circuit for differential detection, etc. The magnetic sensor  150  may include a sensor other than a magnetic sensor (e.g., a potential terminal, an acceleration sensor, etc.). 
     The size of the magnetic sensor  150  is small compared to the size of a conventional SQUID magnetic sensor. Therefore, the mounting of the multiple sensor parts  301  is easy. The mounting of the multiple sensor parts  301  and the other circuits is easy. The multiple sensor parts  301  and the other sensors can be easily mounted together. 
     The base body  302  may include, for example, an elastic body such as a silicone resin, etc. For example, the multiple sensor parts  301  are linked to each other and provided in the base body  302 . For example, the base body  302  can be closely adhered to the head. 
     An input/output cord  303  of the sensor part  301  is connected with a sensor driver  506  and a signal input/output part  504  of the diagnostic device  500 . A magnetic field measurement is performed in the sensor part  301  based on electrical power from the sensor driver  506  and a control signal from the signal input/output part  504 . The result is input to the signal input/output part  504 . The signal that is obtained by the signal input/output part  504  is supplied to a signal processor  508 . Processing such as, for example, the removal of noise, filtering, amplification, signal calculation, etc., are performed in the signal processor  508 . The signal that is processed by the signal processor  508  is supplied to a signal analyzer  510 . For example, the signal analyzer  510  extracts a designated signal for magnetoencephalography. For example, signal analysis to match the signal phases is performed in the signal analyzer  510 . 
     The output of the signal analyzer  510  (the data for which the signal analysis is finished) is supplied to a data processor  512 . Data analysis is performed in the data processor  512 . It is possible to include image data such as, for example, MRI (Magnetic Resonance Imaging), etc., in the data analysis. It is possible to include, for example, scalp potential information such as EEG (Electroencephalogram), etc., in the data analysis. For example, a data part  514  of the MRI, the EEG, etc., is connected with the data processor  512 . For example, nerve firing point analysis, inverse analysis, or the like is performed by the data analysis. 
     For example, the result of the data analysis is supplied to an imaging diagnostic part  516 . Imaging is performed by the imaging diagnostic part  516 . The diagnosis is supported by the imaging. 
     For example, the series of operations described above is controlled by a control mechanism  502 . For example, necessary data such as preliminary signal data, metadata partway through the data processing, or the like is stored in a data server. The data server and the control mechanism may be integrated. 
     The diagnostic device  500  according to the embodiment includes the magnetic sensor  150 , and a processor that processes the output signal obtained from the magnetic sensor  150 . The processor includes, for example, at least one of the signal processor  508  or the data processor  512 . The processor includes, for example, a computer, etc. 
     In the magnetic sensor  150  shown in  FIG. 21 , the sensor part  301  is mounted to the head of a human body. The sensor part  301  may be mounted to the chest of the human body. Magnetocardiography is possible thereby. For example, the sensor part  301  may be mounted to the abdomen of a pregnant woman. Palmoscopy of the fetus can be performed thereby. 
     It is favorable for the magnetic sensor device including the participant to be mounted inside a shielded room. For example, the effects of geomagnetism or magnetic noise can be suppressed thereby. 
     For example, a mechanism may be provided to locally shield the sensor part  301  or the measurement section of the human body. For example, a shield mechanism may be provided in the sensor part  301 . For example, the signal analysis or the data processing may be effectively shielded. 
     According to the embodiment, the base body  302  may be flexible or may be substantially not flexible. In the example shown in  FIG. 21 , the base body  302  is a continuous membrane that is patterned into a hat-like configuration. The base body  302  may have a net configuration. For example, a good fit is obtained thereby. For example, the adhesion of the base body  302  to the human body is improved. The base body  302  may have a hard helmet-like configuration. 
       FIG. 22  is a schematic view showing the inspection device according to the fourth embodiment. 
       FIG. 22  is an example of a magnetocardiography device. In the example shown in  FIG. 22 , the sensor part  301  is provided on a hard base body  305  having a flat plate shape. 
     The input and output of the signal obtained from the sensor part  301  in the example shown in  FIG. 22  are similar to the input and output described with reference to  FIG. 21 . The processing of the signal obtained from the sensor part  301  in the example shown in  FIG. 22  is similar to the processing described with reference to  FIG. 21 . 
     There is a reference example in which a SQUID (Superconducting Quantum Interference Device) magnetic sensor is used as a device to measure a faint magnetic field such as a magnetic field emitted from a living body, etc. Because superconductivity is used in the reference example, the device is large; and the power consumption is large. The load on the measurement object (the patient) is large. 
     According to the embodiment, the device can be small. The power consumption can be suppressed. The load on the measurement object (the patient) can be reduced. According to the embodiment, the SN ratio of the magnetic field detection can be improved. The sensitivity can be increased. 
     Embodiments may include the following configurations (e.g., technological proposals). 
     Configuration 1 
     A magnetic sensor, comprising: 
     a first sensor part including
         a first magnetic element,   a first side magnetic part, and   a first counter side magnetic part; and       

     a conductive member, 
     the conductive member including a first corresponding portion along the first magnetic element, 
     the first magnetic element including:
         a first magnetic layer,   a first counter magnetic layer, a direction from the first magnetic layer toward the first counter magnetic layer being along a first direction, and   a first intermediate magnetic layer located between the first magnetic layer and the first counter magnetic layer,       

     the first side magnetic part including a first side magnetic layer, 
     the first counter side magnetic part including a first counter side magnetic layer, 
     the first intermediate magnetic layer being between the first side magnetic layer and the first counter side magnetic layer in a second direction crossing the first direction. 
     Configuration 2 
     The magnetic sensor according to Configuration 1, wherein 
     a distance along the second direction between the first side magnetic part and the first magnetic element is not more than 0.01 times a first length along the second direction of the first magnetic element. 
     Configuration 3 
     The magnetic sensor according to Configuration 1 or 2, wherein 
     the first magnetic element further includes:
         a first nonmagnetic layer located between the first magnetic layer and the first intermediate magnetic layer; and   a first intermediate nonmagnetic layer located between the first intermediate magnetic layer and the first counter magnetic layer,       

     the first side magnetic part further includes a first stacked side magnetic layer, 
     the first counter side magnetic part further includes a first counter stacked side magnetic layer, and 
     the first counter magnetic layer is between the first stacked side magnetic layer and the first counter stacked side magnetic layer in the second direction. 
     Configuration 4 
     The magnetic sensor according to Configuration 3, wherein 
     the first side magnetic part further includes a first side nonmagnetic layer located between the first side magnetic layer and the first stacked side magnetic layer, 
     the first counter side magnetic part further includes a first counter side nonmagnetic layer located between the first counter side magnetic layer and the first counter stacked side magnetic layer, and 
     the first side nonmagnetic layer and the first counter side nonmagnetic layer include a material included in the first intermediate nonmagnetic layer. 
     Configuration 5 
     A magnetic sensor, comprising: 
     a first sensor part including
         a first magnetic element,   a first stacked magnetic layer, and   a first counter stacked magnetic layer; and       

     a conductive member, 
     the conductive member including a first corresponding portion along the first magnetic element, 
     the first magnetic element including
         a first magnetic layer,   a first counter magnetic layer, a direction from the first magnetic layer toward the first counter magnetic layer being along a first direction,   a first intermediate magnetic layer located between the first magnetic layer and the first counter magnetic layer,   a first nonmagnetic layer located between the first magnetic layer and the first intermediate magnetic layer, and   a first intermediate nonmagnetic layer located between the first intermediate magnetic layer and the first counter magnetic layer,       

     a direction from the first stacked magnetic layer toward the first counter stacked magnetic layer being along a second direction crossing the first direction, 
     a portion of the first counter magnetic layer being between the first magnetic layer and the first stacked magnetic layer, 
     an other portion of the first counter magnetic layer being between the first magnetic layer and the first counter stacked magnetic layer. 
     Configuration 6 
     The magnetic sensor according to Configuration 5, wherein 
     the first stacked magnetic layer contacts the portion of the first counter magnetic layer, or a distance along the first direction between the first stacked magnetic layer and the portion of the first counter magnetic layer is not more than 0.001 times a thickness of the first counter magnetic layer, and 
     the first counter stacked magnetic layer contacts the other portion of the first counter magnetic layer, or a distance along the first direction between the first counter stacked magnetic layer and the other portion of the first counter magnetic layer is not more than 0.001 times the thickness of the first counter magnetic layer. 
     Configuration 7 
     The magnetic sensor according to Configuration 5 or 6, wherein 
     a length along the second direction of the first stacked magnetic layer is not less than 0.01 times and not more than 0.1 times a length along the second direction of the first magnetic element, and 
     a length along the second direction of the first counter stacked magnetic layer is not less than 0.01 times and not more than 0.1 times the length along the second direction of the first magnetic element. 
     Configuration 8 
     The magnetic sensor according to any one of Configurations 1 to 7, wherein 
     a first length along the second direction of the first magnetic element is greater than a first width of the first magnetic element along a direction crossing a plane including the first and second directions. 
     Configuration 9 
     The magnetic sensor according to any one of Configurations 1 to 8, wherein 
     the first sensor part further includes a first magnetic member and a first counter magnetic member, 
     a direction from the first magnetic member toward the first counter magnetic member is along a third direction crossing a plane including the first and second directions, and 
     the first magnetic element overlaps a region between the first magnetic member and the first counter magnetic member in the first direction. 
     Configuration 10 
     The magnetic sensor according to Configuration 9, wherein 
     a portion of the first magnetic element overlaps a portion of the first magnetic member in the first direction, and 
     an other portion of the first magnetic element overlaps a portion of the first counter magnetic member in the first direction. 
     Configuration 11 
     The magnetic sensor according to any one of Configurations 1 to 10, wherein 
     the first corresponding portion overlaps the first magnetic element in a direction crossing the second direction. 
     Configuration 12 
     The magnetic sensor according to Configuration 11, wherein 
     the first magnetic element includes a first end portion and a first other-end portion, 
     a direction from the first end portion toward the first other-end portion is along the second direction, 
     the first corresponding portion includes a first portion and a first other-portion, 
     the first portion corresponds to the first end portion, and 
     the first other-portion corresponds to the first other-end portion. 
     Configuration 13 
     The magnetic sensor according to Configuration 12, wherein 
     the first portion overlaps the first end portion in the first direction, and 
     the first other-portion overlaps the first other-end portion in the first direction. 
     Configuration 14 
     The magnetic sensor according to any one of Configurations 11 to 13, wherein 
     an electrical resistance of the first magnetic element has an even-function characteristic with respect to a current flowing in the first corresponding portion. 
     Configuration 15 
     The magnetic sensor according to any one of Configurations 1 to 7, wherein 
     an electrical resistance of the first magnetic element has an even-function characteristic with respect to a magnetic field applied to the first magnetic element. 
     Configuration 16 
     The magnetic sensor according to Configuration 11, further comprising: 
     a second sensor part including a second magnetic element; 
     a third sensor part including a third magnetic element; 
     a fourth sensor part including a fourth magnetic element; 
     an element current circuit; and 
     a first current circuit, 
     the first magnetic element including a first end portion and a first other-end portion, 
     a direction from the first end portion toward the first other-end portion being along the second direction, 
     the second magnetic element including a second end portion and a second other-end portion, 
     a direction from the second end portion toward the second other-end portion being along the second direction, 
     the third magnetic element including a third end portion and a third other-end portion, 
     a direction from the third end portion toward the third other-end portion being along the second direction, 
     the fourth magnetic element including a fourth end portion and a fourth other-end portion, 
     a direction from the fourth end portion toward the fourth other-end portion being along the second direction, 
     the conductive member including
         a second corresponding portion along the second magnetic element,   a third corresponding portion along the third magnetic element, and   a fourth corresponding portion along the fourth magnetic element,       

     the first corresponding portion including a first portion and a first other-portion, 
     the first portion corresponding to the first end portion, 
     the first other-portion corresponding to the first other-end portion, 
     the second corresponding portion including a second portion and a second other-portion, 
     the second portion corresponding to the second end portion, 
     the second other-portion corresponding to the second other-end portion, 
     the third corresponding portion including a third portion and a third other-portion, 
     the third portion corresponding to the third end portion, 
     the third other-portion corresponding to the third other-end portion, 
     the fourth corresponding portion including a fourth portion and a fourth other-portion, 
     the fourth portion corresponding to the fourth end portion, 
     the fourth other-portion corresponding to the fourth other-end portion, 
     the element current circuit being configured to supply an element current to the first, second, third, and fourth magnetic elements, 
     the first current circuit being configured to supply a first current to the first, second, third, and fourth corresponding portions, 
     the first current including an alternating current component. 
     Configuration 17 
     The magnetic sensor according to Configuration 16, wherein 
     at a first time at which the first current is supplied to the conductive member:
         the element current flows through the first magnetic element in an orientation from the first end portion toward the first other-end portion;   the element current flows through the second magnetic element in an orientation from the second end portion toward the second other-end portion;   the element current flows through the third magnetic element in an orientation from the third end portion toward the third other-end portion;   the element current flows through the fourth magnetic element in an orientation from the fourth end portion toward the fourth other-end portion;   the first current flows through the first corresponding portion in an orientation from the first other-portion toward the first portion;   the first current flows through the second corresponding portion in an orientation from the second portion toward the second other-portion;   the first current flows through the third corresponding portion in an orientation from the third portion toward the third other-portion; and   the first current flows through the fourth corresponding portion in an orientation from the fourth other-portion toward the fourth portion.       

     Configuration 18 
     The magnetic sensor according to Configuration 17, wherein 
     the first other-end portion is electrically connected with the second end portion, 
     the first end portion is electrically connected with the third end portion, 
     the third other-end portion is electrically connected with the fourth end portion, 
     the second other-end portion is electrically connected with the fourth other-end portion, 
     the element current circuit is configured to supply the element current between a first connection point and a second connection point, 
     the first connection point is between the first end portion and the third end portion, and 
     the second connection point is between the second other-end portion and the fourth other-end portion, 
     the first portion is electrically connected with the third portion, 
     the first other-portion is electrically connected with the second portion, 
     the third other-portion is electrically connected with the fourth portion, 
     the second other-portion is electrically connected with the fourth other-portion, 
     the first current circuit is configured to supply the first current between a fifth connection point and a sixth connection point, 
     the fifth connection point is between the first other-portion and the second portion, and 
     the sixth connection point is between the third other-portion and the fourth portion. 
     Configuration 19 
     The magnetic sensor according to Configuration 17 or 18, further comprising: 
     a detection circuit, 
     the detection circuit being configured to detect a change of a potential between a third connection point and a fourth connection point, 
     the third connection point being between the first other-end portion and the second end portion, 
     the fourth connection point being between the third other-end portion and the fourth end portion. 
     Configuration 20 
     An inspection device, comprising: 
     the magnetic sensor according to any one of Configurations 1 to 19; and 
     a processor configured to process a signal output from the magnetic sensor. 
     According to embodiments, a magnetic sensor and an inspection device can be provided in which the sensitivity can be increased. 
     In the specification of the application, “perpendicular” and “parallel” refer to not only strictly perpendicular and strictly parallel but also include, for example, the fluctuation due to manufacturing processes, etc. It is sufficient to be substantially perpendicular and substantially parallel. 
     Hereinabove, exemplary embodiments of the invention are described with reference to specific examples. However, the embodiments of the invention are not limited to these specific examples. For example, one skilled in the art may similarly practice the invention by appropriately selecting specific configurations of components included in magnetic sensors such as magnetic elements, magnetic layers, nonmagnetic layers, magnetic members, conductive members, circuits, etc., from known art. Such practice is included in the scope of the invention to the extent that similar effects thereto are obtained. 
     Further, any two or more components of the specific examples may be combined within the extent of technical feasibility and are included in the scope of the invention to the extent that the purport of the invention is included. 
     Moreover, all magnetic sensors, and inspection devices practicable by an appropriate design modification by one skilled in the art based on the magnetic sensors, and the inspection devices described above as embodiments of the invention also are within the scope of the invention to the extent that the purport of the invention is included. 
     Various other variations and modifications can be conceived by those skilled in the art within the spirit of the invention, and it is understood that such variations and modifications are also encompassed within the scope of the invention. 
     While certain embodiments have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the inventions. Indeed, the novel embodiments described herein may be embodied in a variety of other forms; furthermore, various omissions, substitutions and changes in the form of the embodiments described herein may be made without departing from the spirit of the inventions. The accompanying claims and their equivalents are intended to cover such forms or modifications as would fall within the scope and spirit of the invention.