Abstract:
A write element for recording data on a magnetic medium is provided having an impedance designed to substantially match the impedance of an electrical interconnection between it and a pre-amp chip located nearby on the load beam. Additional embodiments are directed to incorporating a read element with the write element to form a read/write head, and to further incorporate the read/write head into a magnetic disk drive. Further embodiments are directed towards the fabrication of the write element.

Description:
BACKGROUND OF THE INVENTION 
     This invention relates generally to magnetic data storage systems, more particularly to thin film read/write heads, and most particularly to a write element with an impedance tailored to be able to match the impedance of a shorten connector between a pre-amp chip and the write element, allowing for both higher data transfer rates and higher storage capacities. 
     Magnetic disk drives are used to store and retrieve data for digital electronic apparatuses such as computers. In FIGS. 1A and 1B, a magnetic disk data storage system  10  includes a sealed enclosure  12 , a disk drive motor  14 , and a magnetic disk, or media,  16  supported for rotation by a drive spindle S 1  of motor  14 . Also included are an actuator  18  and an arm  20  attached to an actuator spindle S 2  of actuator  18 . A suspension  22  is coupled at one end to the arm  20 , and at its other end to a read/write head or transducer  24 . The transducer  24  typically includes an inductive write element with a sensor read element (which will be described in greater detail with reference to FIG.  2 ). As the motor  14  rotates the magnetic disk  16 , as indicated by the arrow R, an air bearing is formed under the transducer  24  causing it to lift slightly off of the surface of the magnetic disk  16 , or, as it is sometimes termed in the art, to “fly” above the magnetic disk  16 . Data bits can be written to and read from a magnetic “track” as the magnetic disk  16  rotates. Also, information from various tracks can be read from the magnetic disk  16  as the actuator  18  causes the transducer  24  to pivot in an arc as indicated by the arrows P. The width of a track is sometimes called the “trackwidth.” Narrower trackwidths allow a greater number of tracks to be placed on a magnetic disk  16 , thereby increasing its total storage capacity. The design and manufacture of magnetic disk data storage systems is well known to those skilled in the art. 
     FIG. 2 depicts a magnetic read/write head  24  of the prior art including a read element  26  and a write element  28 . Surfaces of the read element  26  and write element  28  also define a portion of an air bearing surface ABS, in a plane  29 , which can be aligned to face the surface of the magnetic disk  16  (see FIGS.  1 A and  1 B). The read element  26  includes a first shield  30 , an intermediate layer  32 , which functions as a second shield, and a read sensor  34  that is located within a dielectric medium  35  between the first shield  30  and the second shield  32 . The most common type of read sensor  34  used in the read/write head  24  is the magnetoresistive (AMR or GMR) sensor which is used to detect magnetic field signals from a magnetic medium through changing resistance in the read sensor. 
     The write element  28  is typically an inductive write element which includes a first pole  38  and the intermediate layer  32 , which functions as a second pole. A second pole pedestal  42  is connected to a second pole tip portion  45  of the second pole. The first pole  38  and the second pole  32  are attached to each other by a backgap portion  40 , with these three elements collectively forming a yoke  41  with the second pole pedestal  42 . The area around the first pole tip portion  43  and a second pole tip portion  45  near the ABS is sometimes referred to as the yoke tip region  46 . A write gap  36  is formed between the first pole  38  and the second pole pedestal  42  in the yoke tip region  46 , and is formed from a non-magnetic electrically insulating material. This non-magnetic material can be either integral with or separate from (as shown here) a first insulation layer  47  that lies between the first pole  38  and the second pole  32 , and extends from the yoke tip region  46  to the backgap portion  40 . 
     Also included in write element  28  is a conductive coil layer  48 , formed of multiple winds  49 . The conductive coil  48  is positioned within a coil insulation layer  50  that lies below the first pole  38 . The coil insulation layer  50  thereby electrically insulates the coil layer  48  from the first pole  38  and insulates the multiple winds  49  from each other, while the first insulation layer  47  electrically insulates the winds  49  from the second pole  32 . 
     An inductive write head such as that shown in FIG. 2 operates by passing a writing current through the conductive coil layer  48 . Because of the magnetic properties of the yoke  41 , a magnetic flux can be induced in the first and second poles  38  and  32  by a write current passed through the coil layer  48 . The write gap  36  allows the magnetic flux to fringe out from the yoke  41  (thus forming a fringing gap field) and to cross a magnetic recording medium that is placed proximate the ABS. 
     FIG. 3 shows an alternative magnetic write element  25  of the prior art including two conductive coil layers  60  and  62 . The overall structure of magnetic write element  25  is similar to write element  28  and includes a first pole  38 , a second pole  32 , a backgap  40 , a second pole pedestal  42 , a write gap  36 , and a first insulation layer  47 . The primary differences between this prior art write element  25  and write element  28  of FIG. 2 is the additional write gap layer  27  of which the write gap  36  is part, and the arrangement of two stacked coil layers  60  and  62  rather than a single coil layer  48 . 
     In write element  25  the write gap layer  27  may be formed of a non-magnetic electrically insulating material disposed above the first insulation layer  47 . A first coil layer  60  is formed of first multiple winds  64  disposed above the write gap layer  27 . The first multiple winds  64  are insulated from one another, and covered by, a second insulation layer  65 . A second coil layer  62  is formed of second multiple winds  66  disposed above the second insulation layer  65 . The second multiple winds are insulated from one another, and covered by, a third insulation layer  67 . The first multiple winds  64  and the second multiple winds  66  are both formed of electrically conductive materials. The second insulating layer  65  and the third insulating layer  67  are both formed from non-magnetic electrically insulating materials. The second insulating layer  65  insulates the first coil layer  60  from the first pole  38  and from the second coil layer  62 . The third insulating layer  67  insulates the second coil layer  62  from the first pole  38 . 
     The write element  25  with two coil layers  60  and  62  has certain advantages over the write element  28  with one coil layer  48 . Stacking multiple coil layers permits write element  25  to be more compact, shortening the distance from the backgap  40  to the second pole pedestal  42 , a distance sometimes referred to as the yoke length YL. A shorter yoke length permits a shorter flux rise time, the length of time necessary for the fringing gap field across the write gap  36  to rise to its maximum intensity from its minimum intensity when an electric current is passed through the coil winds. The rate at which data may be written to a magnetic disk  16  increases as the flux rise time decreases. Therefore, a shorter yoke length allows higher data recording rates to be achieved. 
     Unfortunately, stacking multiple coil layers in a write element can be a disadvantage as well. Multiple coil layers can increase another parameter, sometimes referred to as the stack height SH, the distance between the top surface of the first pole  38  and the top of the second pole  32 . The increased topography of the write element created by a larger stack height can make the formation of the first pole  38  more difficult, leading to both decreased performance and lower yields. 
     FIG. 4 shows a head gimbal assembly (HGA) according to the prior art. The head gimbal assembly includes a base  21  attached to a load beam  23 . The load beam  23  includes an arm  20  attached between the base  21  and a suspension  22 . The suspension  22  is attached to the arm  20  at a first end and is attached to a read/write head  24  at an opposite end. A pre-amp chip  142  is attached to the base  21 . The pre-amp chip  142  is electrically connected to the read/write head  24  by a metallic interconnection  144  such as copper traces or wires. The metallic interconnection  144  carries electrical signals between the pre-amp chip  142  and the read/write head  24 . In addition, the pre-amp chip  142  is connected to a controller connector  146  which can electrically connect the pre-amp chip to a controller (not shown). Thus, the pre amp-chip  142  is also configured to pass electric signals to and from the controller. 
     The pre-amp chip  142  is located on the base  21  to place it close to the read/write head  24 . Shortening the distance between the pre-amp chip  142  and the read/write head  24  allows for a higher circuit resonant frequency, in turn allowing for higher data transfer rates. However, it is also necessary to match the impedance of the metallic interconnection  144  with the impedance of the read/write head  24  as failure to do so may degrade the signal. To match the impedance of prior art read/write heads  24 , a metallic interconnection  144  of the prior art has had to be sufficiently long, as impedance in a conductor increases as a function of its length. Consequently, this has necessitated placing the pre-amp chip  142  further away from the read/write head  24  than would otherwise be desirable. 
     Thus, what is desired is a write element with a lower impedance that would allow a pre-amp chip to be located nearer to the write element and preferably on the load beam itself. Further, it is desired that fabrication of such a write element, and a read/write head incorporating the same, be inexpensive, quick, and simple. 
     SUMMARY OF THE INVENTION 
     The present invention provides a magnetic recording device and method for making the same having a specifically tailored impedance to allow for a pre-amp chip to be located on the load beam nearer to the recording device than previously possible. 
     In an embodiment of the present invention a recording device for recording data on a magnetic medium comprises a yoke, a write gap layer, two coil layers, and three insulation layers. The yoke, having a characteristic yoke length, comprises a first pole, a second pole, a backgap portion, and a first pole pedestal, each formed of ferromagnetic materials. The first and second poles each have a pole tip portion aligned with one another. Both poles are magnetically connected by way of the backgap portion, located distal their respective pole tip portions. The first pole pedestal is magnetically connected to, and aligned with, the first pole tip portion. Another embodiment is directed towards incorporating into the yoke a second pole pedestal, also formed of a ferromagnetic material, and situated between the write gap layer and the second pole. 
     The yoke forms a discontinuous ring with a single gap. Within the interior space defined by the yoke are a write gap layer, two coil layers, and three insulation layers. The write gap layer extends from the write gap region, the space between the first pole pedestal and the second pole tip portion, to the distal end of the second pole, and separates the turns of the first coil layer from the turns of the second coil layer. A first pole insulation layer insulates the first pole from the turns of the first coil layer, and a first coil insulation layer disposed between the turns of the first coil layer insulates those turns from one another. A second coil insulation layer insulates the turns of the second coil layer from each other and from the second pole. The write gap layer and each of the insulation layers may be formed of suitable non-magnetic and electrically insulating materials, while the turns of the two coil layers may be formed of electrically conductive materials. At a minimum, each coil layer has at least one turn. 
     This structure is advantageous because it allows for a shorter yoke length that reduces the device&#39;s flux rise time, thus, allowing for higher data recording rates. The placement of the write gap layer is also advantageous in this design because it limits the height of the first coil layer, thereby reducing the overall stack height of the device. Reducing the stack height facilitates the formation of the second pole. 
     Another embodiment of the present invention is a data transfer device for exchanging data with a magnetic medium comprising a load beam to which a recording device and a pre-amp chip are attached. The recording device is configured according to the embodiments previously described. The pre-amp chip is electrically connected to the recording device, and is connectable to a controller. The pre-amp chip is intended to pass electrical signals to and from both the controller and the recording device. Yet another embodiment is directed to locating the pre-amp chip at a sufficient distance from the recording device such that the impedance of the recording device and the impedance of a connector between the recording device and the pre-amp chip are substantially equal. Minimizing the impedance mismatch between the connector and the recording device while locating the pre-amp chip closer to the recording device is advantageous for decreasing the current rise time and the flux rise time, allowing for higher data transfer rates. 
     Still other embodiments include a read element, also connected to the pre-amp chip. Such a read element may include two shields and a read sensor, where the read sensor is disposed between a first shield and the first pole of the recording device configured to act as a second shield. Yet other embodiments additionally include a medium support and a read/write head support system. The medium support may further include a spindle on which the magnetic medium can be supported, and a medium motor capable of rotating the magnetic medium around the axis of the spindle. The read/write head support system further includes the load beam and pre-amp chip, and is intended to suspend the read/write head proximate to the magnetic medium. 
     In yet another embodiment of the present invention, a method for forming a recording device includes providing a first pole having a pole tip portion. The first pole is substantially planarized prior to forming a first pole pedestal above and magnetically connected to the first pole at its pole tip portion. A backgap portion is formed above and magnetically connected to the first pole distal to its pole tip portion. A first pole insulation material is deposited over the first pole pedestal, first pole, and backgap portion and a first pre-coil layer is formed above the first pole insulation layer. A first coil insulation layer is deposited over the first pre-coil layer and then substantially planarized to expose the first pole pedestal, first pre-coil layer, and backgap portion. A write gap layer is formed over the exposed first pole pedestal and first coil layer, and a second coil layer is formed above the write gap layer. A second coil insulation layer is formed over the second coil layer, and a second pole is formed over the write gap material and second coil insulation layer, and also over the backgap portion with which it is magnetically connected. 
     Further embodiments are directed to forming a second pole pedestal within the recording device, forming a read element connected to the recording device, attaching the recording device and the read element to a load beam, and attaching a pre-amp chip to the load beam, to the recording device, and to the read element. Still other embodiments include incorporating the recording device and read element within a read/write head, combining the read/write head with a suspension system, and providing a support system for supporting the magnetic medium proximate to the read/write head. 
     These and other advantages of the present invention will become apparent to those skilled in the art upon a reading of the following descriptions of the invention and upon studying the several figures of the drawings. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The present invention will be readily understood by the following detailed description in conjunction with the accompanying drawings, and like reference numerals designate like elements. 
     FIG. 1A is a partial cross-sectional elevation view of a magnetic data storage system; 
     FIG. 1B is a top plan view along line  1 B— 1 B of FIG. 1A; 
     FIG. 2 is a cross-sectional view of a read/write head including a single coil layer according to the prior art; 
     FIG. 3 is a cross-sectional view of a read/write head including two coil layers according to the prior art; 
     FIG. 4 is a perspective view of a head gimbal assembly (HGA) according to the prior art; 
     FIG. 5 is a cross sectional view of a read/write head according to an embodiment of the present invention; 
     FIG. 6 is an ABS view of a write element of the read/write head according to an embodiment of the present invention; 
     FIGS. 7-12 are cross-sectional views of a read/write head at various stages of fabrication, according to an embodiment of the present invention; 
     FIG. 13 is an ABS view of a write element of the read/write head according to another embodiment of the present invention; and 
     FIG. 14 is a perspective view of a head gimbal assembly (HGA) according to an embodiment of the present invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     FIGS. 1A,  1 B, and  2 - 4  were discussed with reference to the prior art. 
     FIG. 5 is a cross sectional view of a read/write head  70  of the present invention. The read/write head  70  includes a read element  72  and a write element  74 . Both the read element  72  and write element  74  have surfaces that form part of an air bearing surface (ABS), in a plane  76 , which can be aligned to face the surface of a magnetic disk  16  (see FIGS.  1 A and  1 B). The read element  72  includes a first shield  30 , an intermediate layer  78 , which functions as a second shield, and a read sensor  34  that is located within a dielectric medium  35  between the first shield  30  and the second shield  78 . As with the prior art, the read sensor  34  can be a magnetoresistive sensor, such as an AMR or GMR sensor. Further, the first shield  30  and the second shield  78  can be formed of a ferromagnetic material, such as a nickel iron (NiFe) alloy. 
     The write element  74  includes the intermediate layer  78 , which operates as a first pole, and a second pole  80  which is also formed of a ferromagnetic material, such as NiFe. The first pole  78  and the second pole  80  are connected by a backgap portion  82 , located distal to the ABS, which is additionally formed of a ferromagnetic material, for example NiFe. A first pole pedestal  84  is connected to a first pole tip portion  86  of the first pole  78 . Further, the first pole pedestal  84  is aligned with a second pole tip portion  88 . Collectively, the first pole  78 , second pole  80 , first pole pedestal  84 , and backgap portion  82  form a yoke  90 . Additionally, the region of the write element  74  which includes the first pole pedestal  84 , a first pole tip portion  86 , and a second pole tip portion  88 , is referred to as the yoke tip portion  92 . Within the yoke tip portion  92  there is additionally a write gap  89  situated between the first pole pedestal  84  and the second pole tip region  88 . The write gap  89  may be formed of any suitable electrically insulating, non-magnetic material such as Silicon dioxide (SiO 2 ). 
     A first coil layer  94 , and a second coil layer  96  are disposed between the first pole  78  and the second pole  80 . As is well known to those skilled in the art, the first and second coil layers  94 ,  96  can include one or more coil turns  98 ,  100 , respectively that are formed of an electrically conductive material, such as copper. Also, as is well known in the art, the first coil layer  94  can be electrically connected with the second coil layer  96 . 
     Both the first coil layer  94  and the second coil layer  96  are electrically insulated from the yoke  90 . The first coil layer  94  is electrically insulated from the first pole  78  by a first pole insulation layer  102 . The first pole insulation layer  102  extends from the first pole pedestal  84  to the backgap portion  82 , and can be formed of any suitable electrically insulating, non-magnetic material such as silicon dioxide (SiO 2 ) or alumina (Al 2 O 3 ). The first pole insulation layer  102  can be relatively thin, for example in the range of about 0.1 micron to about 0.5 micron. While the first coil turns  98  can be electrically connected in a spiral fashion as is know the art, they are transversely electrically insulated from adjacent other first coil turns  98  by a first coil insulation layer  104 . The first coil insulation layer  104  can include discrete segments disposed between adjacent first coil turns  98  as well as between the first coil layer  94  and the backgap portion  82 , and between the first coil layer  94  and the first pole pedestal  84 . The first coil insulation layer  104  can be formed of any suitable non-magnetic, electrically insulating material, for example alumina (Al 2 O 3 ). As shown in FIG. 5, the first pole insulation layer  102  also insulates the first coil layer  94  from the backgap portion  82  and the first pole pedestal  84 . However, in other embodiments the only insulation between the first coil layer  94  and the first pole pedestal  84  may be the first coil insulation layer  104 , or alternatively the only insulation may be the first pole insulation layer  102 . Similarly, in other embodiments the only insulation between the first coil layer  94  and the backgap portion  82  may be the first coil insulation layer  104 , or alternatively the only insulation may be the first pole insulation layer  102 . 
     A write gap layer  106  is disposed above the first pole pedestal  84 , the first coil layer  94  and the first coil insulation layer  104 . The write gap layer  106  can be formed of any suitable non-magnetic, electrically insulating material, such as alumina or silicon dioxide. Thus, the write gap layer  106  may also be coextensive with the write gap  89  and electrically insulate the first coil layer  94  form the second coil layer  96 . A second coil insulation layer  108  covers the second coil layer  96 , including between adjacent second coil turns  100 . In this way, the second coil insulation layer  108  provides electrical insulation between adjacent second coil turns  100 , and between the second coil layer  96  and the second pole  80 . The second coil insulation layer  108  can be formed of any suitable non-magnetic, electrically insulating material, such as alumina, or cured photo resistive material, sometime referred to as “photoresist.” 
     FIG. 6 is an ABS view of a write element  74  of the read/write head  70 , according to an embodiment of the present invention. As can be seen from FIG. 6, a width WP 1 P of an edge the first pole pedestal  84  at the ABS is narrower than the first pole tip portion  86  of the first pole  78 , and also narrower than the second pole tip portion  88  of the second pole  80 . Since a trackwidth of the write element  74  is effectively equal to the smallest width of the two components adjoining the write gap, the width WP 1 P of the edge of the first pole pedestal  84  essentially defines the trackwidth for the write element  74 . Preferably, the width of the edge of the first pole pedestal  84  is in the range of about 0.2 micron to about 1.0 micron. 
     FIGS. 7-12 are cross-sectional views depicting the formation of the write element  74  at different stages of fabrication, according to another embodiment of the present invention. As shown in FIG. 7, a first pole  78  surrounded by a build up layer  79  is provided. The first pole can be formed of any suitable ferromagnetic material, such as NiFe. In addition, the build up layer  79  can be formed of any suitable non magnetic, electrically insulating material, such as alumina. The first pole  78  and buildup layer  79  can be planerized to form a substantially planer upper surface  114 . For example, the planerization can be performed using known techniques such as chemical mechanical polishing (CMP), or any other technique that result in a surface  114  that is substantially planer. 
     As shown in FIG. 8, a first pole pedestal  84  and a backgap portion  82  are formed above and electrically connected to the first pole  78 . The first pole pedestal  84  and backgap portion  82  can be formed by any suitable method, including various methods and techniques known to those skilled in the art. For example, a first patterned plating mask can be formed above the first pole  78 . Such a mask can be formed, for example, by patterning photoresist as is well known in the art. A ferromagnetic material can then be plated over the first pole  78  with the first patterned plating mask in place. The ferromagnetic material can be any material having desirable magnetic properties, for example NiFe. The patterned plating mask is then removed, leaving the first pole pedestal  84  and back gap portion  82  above the first pole  78 . Also shown in FIG. 8, a first pole insulation material  116  is deposited over the first pole pedestal  84  and backgap portion  82 , as well as the first pole  78 . The first pole insulation material can be any suitable non-magnetic, electrically insulating material, such as silicon dioxide, and can be deposited using techniques well known in the art. 
     FIG. 9 depicts the formation of a first pre-coil layer  118  above the first pole insulation material  116 . The first pre-coil layer  118  can include one or more first pre-coil turns  120 . The pre-coil turns  120  can be spirally connected, as is well known in the art, i.e., each pre-coil turn  120  can be electrically connected in series with an adjacent pre-coil turn  120 . As is also well known in the art, the first pre-coil turns  120  can wind around the backgap portion  82 , with an inside portion Tin of the pre-coil turns  120  disposed between the first pole pedestal  84  and the backgap portion  82 , and an outside portion Tout of the first pre-coil turns  120  disposed on a side of the backgap portion  82  opposite from the first pole pedestal  84 . Thus, a single turn  120   a  appears in cross section in FIG. 9 on opposite sides of the backgap portion  82 , as does another turn  120   b  that is positioned within the first turn  120   a.    
     The first pre-coil layer can be formed of any suitable electrically conductive material, such as copper. The first pre-coil layer can be formed using known methods, for example by platting. More specifically, a second patterned mask can be formed above the first pole insulation material  116 . A first electrically conductive material can then be plated over the first pole insulation material  116  with the second patterned plating mask in place. When the second patterned plating mask is removed, the first pre-coil layer remains above the first pole insulation layer  116 . Over the first pole insulation layer  116  and the first pre-coil layer  118  is deposited a first coil insulation layer material  122 . The first coil insulation material can be formed of any suitable non-magnetic electrically insulating material, such as alumina or silicon dioxide. 
     The first coil insulation layer material  122  and the first pole insulation material  116  are then substantially planerized to expose the first pole pedestal  84 , the backgap portion  82 , and the first pre-coil layer  118 , as is shown in FIG.  10 . This planerization can be performed by any known method, for example chemical mechanical polishing. Such planerization may be continued beyond simply exposing the first pole pedestal  84 , the backgap portion  82 , and the first pre-coil layer  118 , and may also include planerization of the first pole pedestal  84 , backgap portion  82 , and first pre-coil layer  118  themselves. After the planerization, the remaining portion of the first pre-coil layer  118  forms a first coil layer  94  having one or more first coil turns  98 . [e.g., two first coil turns  98  are shown in FIG.  10 ] This planerization process substantially defines the dimension of the first pole pedestal  84 , backgap portion  82 , and first coil layer  124  in the direction perpendicular to surface  114 . 
     As depicted in FIG. 11, a write gap layer  106  is formed over the exposed first pole pedestal  84  and the first coil layer  94 . Importantly, the backgap portion  82  remains exposed. The write gap material layer  106  can be formed of any suitable non-magnetic, electrically insulating material, such as alumina. A second coil layer  96  is then formed above the write gap layer  106 . The second coil layer is formed of any suitable electrically conductive material, such as copper, and includes one or more second coil turns  100 . The second coil layer  96  can be formed using a variety of known methods and/or techniques. For example, a third patterned plating mask can be formed above the write gap layer  106 . A second electrically conductive material can then be plated above the write gap layer  106  with the third patterned plating mask in place. The second electrically conductive material can be the same or a different material than the first electrically conductive material, for example copper can be used. The third patterned plating mask can then be removed, with the remaining second conductive material forming the second coil layer  96 . 
     A second coil insulation layer  108 , shown in FIG. 12 is formed over a second coil layer  96 , including filling the spaces between adjacent second coil turns  100 . The second coil insulation layer  108  can be formed of any suitable non magnetic, electrically insulating material, such as cured photoresist. 
     A second pole  80  is then formed over the write gap layer  106 , backgap portion  82 , and second coil insulation layer  108 . The second pole  80  can be formed of any suitable ferromagnetic material, such as NiFe, and can be formed using any of a variety of known methods and techniques, for example, masking and plating. The formation of the read/write head  70  can additionally include the formation of other elements, such as an overcoat layer above the second pole. Once the wafer level fabrication is complete, the read/write head  70  can be cut from the wafer and lapped to form an ABS in the plane  76 . 
     It should be noted that the completed write element  74  shown in FIG. 12 can include only a total of four coil turns while maintaining a yoke length YL of about 5 microns. Of course, additional coil turns can be included in one or both of the first coil layer  94 , and the second coil layer  96 . For example, a total of about 2 to about 15 coil turns can be included, with even more coil turns being included if desired. To accommodate this range of coil turns, the yoke length YL of the write element  74  can be in the range of about 3 microns to about 35 microns. 
     FIG. 13 shows another embodiment of the present invention in which a write element  130  can further include a second pole pedestal  132  electrically connected to the second pole tip portion  88  of the second pole  80 . The second pole pedestal  132  can be formed of any suitable ferromagnetic material, such as NiFe. In such a configuration, the write gap  89  is defined between the first pole pedestal  84 , and the second pole pedestal  132 . To form the write element  130 , a second pole pedestal  132  can be formed above the write gap layer  106  before formation of the second pole  80 . The width WP 2 P of the second pole pedestal  132  can be defined during plating of ferromagnetic material with a patterned plating mask. Alternatively, before formation of the second pole  80 , the width WP 2 P can be defined by etching or by ion milling. In addition, at the time the second pole pedestal  132  is being defined by ion milling, the width WP 1 P of the first pole pedestal  84  can also be narrowed by ion milling. In such a case, the first pole pedestal  84  can be plated wider than the desired final width WP 1 P. Thus, the width WP 2 P of the second pole pedestal  132 , can be defined as substantially equal to the width WP 1 P of the first pole pedestal  84 . 
     In yet another embodiment, a second pole  80  of the write element  74  shown in FIG. 5, can be formed with a second pole tip portion  88  that is narrower than the first pole pedestal  84  and the first pole tip portion  86  at the ABS. With such a configuration, the track width of the write element  74  is instead a function of the second pole tip portion  88  width at the ABS rather than the width WP 1 P of the edge of the first pole pedestal. 
     FIG. 14 shows a head gimbal assembly (HGA) which includes a base  21  attached to a load beam  23 . The load beam  23  includes an arm  20  attached between the base  21  and a suspension  22 . The suspension  22  is attached to the arm  20  at a first end and is attached to a read/write head  70  at an opposite end. A pre-amp chip  142  is also located on the load beam  23 , for example on the arm  20  as shown in FIG.  14 . The pre-amp chip  142  is electrically connected to the read/write head  70  via a metallic interconnection  144 . The metallic interconnection  144  carries electrical signals between the pre-amp chip  142  and the read/write head  70 . In addition, the pre-amp chip  142  is connected to a controller connector  146  that can electrically connect the pre-amp chip to a controller (not shown). Thus, the pre amp-chip  142  is also configured to pass electric signals to and from the controller. 
     By locating the pre-amp chip  142  closer to the read/write head  70 , the metallic interconnection  144  can have a length L 2  that is shorter than the head connector length of the prior art (See FIG.  4 ), and preferably in the range of 10 mm to 20 mm. With this shorter length L 2  the impedance of the metallic interconnection  144  is reduced over the prior art. An advantage of the lower impedance in metallic interconnection  144  is it further leads to a decrease in the current rise time of the recording current that is passed through the coil layers  94  and  96 . This reduction in current rise time further reduces the flux rise time at the write gap  89 . Thus, decreasing L 2  may lead to higher data recording rates. 
     To avoid an impedance mismatch between the metallic interconnection  144  and the read/write head  70 , and particularly with the write element  74 , the configuration of the present invention can be used. For example the write element  70  of the present invention can be formed with a total of four coil turns which can cause the write element  74  to exhibit an impedance of about 3 nanohenrys (nh), substantially similar to the impedance of a head connector having a length L 2 . Further, because the total number of turns can be included in two different coil layers  94  and  96 , the yoke length YL of the write element  74  can be shorter than if the total number of coil turns were included in a single coil layer. For example, with a total of four coil turns, the yoke length YL can be about 5 microns. This shorter yoke length YL further facilitates a shorter flux rise time than would be exhibited by a single coil layer of 4 turns. This further reduced flux rise time allows even higher data transfer rates to be achieved. For example, maximum data rates can be achieved of over about 2 gigabytes per second (Gb/s). In addition, with the first coil layer  94  disposed below the write gap layer  106 , the stack height SH of the write element  74  (see FIG. 12) is maintained substantially the same as a write element including only a single coil layer. Thus, difficulties in the formation of the second pole  80  can be substantially avoided, while providing a greater number of turns, and therefore providing a higher magnetic motive force given the same write current. As an additional advantage, each of the above advantages can be realized with the use of existing fabrication methods, processes, and techniques, while maintaining a desirable time and cost of fabrication with a satisfactory fabrication yield. 
     In summary, the present invention provides structures and methods for providing a magnetic recording device with a chip on load-beam arrangement in which the impedance of the head connector is substantially similar to the impedance of the write element. This design allows for the pre-amp chip to be located closer to the recording device for higher data transfer rates. The invention has been described herein in terms of several preferred embodiments. Other embodiments of the invention, including alternatives, modifications, permutations and equivalents of the embodiments described herein, will be apparent to those skilled in the art from consideration of the specification, study of the drawings, and practice of the invention. The embodiments and preferred features described above should be considered exemplary, with the invention being defined by the appended claims, which therefore include all such alternatives, modifications, permutations and equivalents as fall within the true spirit and scope of the present invention.