Abstract:
A sputtering apparatus including a target holder configured to hold at least two targets; a substrate holder configured to hold a substrate; a first shutter plate arranged between the target holder and the substrate holder, the first shutter plate having at least two holes and being capable of rotating around an axis; a second shutter plate arranged between the first shutter plate and the substrate holder, the second shutter plate having at least two holes and being capable of rotating around the axis; wherein the first and second shutter plates are rotated such that paths are simultaneously created between the at least two targets and the substrate through the at least two holes of the rotated first shutter plate and the at least two holes of the rotated second shutter plate, and a film is formed on the substrate by co-sputtering of the at least two targets.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    The present application is a continuation of U.S. Ser. No. 12/272,338, filed on Nov. 17, 2008, which is a continuation of U.S. Ser. No. 11/078,549, filed on Mar. 14, 2005, and which claims priority to Japanese Patent Application No. 2004-70929, filed Mar. 12, 2004. The entire contents of Ser. No. 12/272,338, Ser. No. 11/078,549, and JP 2004-70929 are incorporated herein by reference. 
     
    
     BACKGROUND OF THE INVENTION 
       [0002]    1. Field of the Invention 
         [0003]    The present invention relates to a shutter control method for a multi-sputtering system. It also relates to a double-layer shutter control method suitable for preventing cross-contamination in a multi-sputtering system providing a plurality of targets made of different materials in a single chamber and forming a multi-layer film utilizing a double-layer rotating shutter mechanism. 
         [0004]    2. Description of the Related Art 
         [0005]    The assignee previously proposed a magnetic multi-layer film-forming system (U.S. Patent Application Publication No. 2002/0064595). When producing a giant magnetoresistance (GMR) or tunnel magnetoresistance (TMR) head, MRAM, etc., this magnetic multi-layer film-forming system can form a required multi-layer film in a single chamber by sputtering from the lowermost layer to the uppermost layer on a substrate continuously without interruption and can deposit a large number of magnetic films at one time. 
         [0006]    In order to enable formation of a multi-layer film by sputtering as described above, this film-forming system provides, for example, five targets made of different materials at a chamber ceiling, that is, the space above the substrate to be formed with the film, in a single chamber, then using a shutter mechanism for selecting the target for sputtering. This shutter mechanism has a double-layer structure of independently rotating shutters. Each of the two shutter plates is formed at required positions with a required number of holes through which selected targets can be seen from the substrate side. The double-layer rotating shutter mechanism shields the targets of the materials not being used for sputtering. The target for sputtering appears to the substrate through the corresponding holes. This double-layer rotating shutter mechanism independently rotates two substantially circular shutter plates as seen from a parallel arranged substrate. Due to this, matching positions of the holes of the shutter plates are selected. The double-layer rotating shutter mechanism is used so as to make the target made of the material being used for sputtering face the substrate through the holes so as to select the target for sputtering. 
         [0007]    The above multi-layer film-forming system is a multi-sputtering system providing a plurality of targets made of different materials in a single sputtering chamber, sequentially depositing films made of different materials on a substrate, and thereby forming a multi-layer film. This multi-sputtering system, as explained above, suitably shields the five targets made of the different materials by the double-layer rotating shutter mechanism in the single sputtering chamber to select the target used for sputtering and thereby performs the sputtering according to a previously set film-forming sequence. 
         [0008]    When selecting a plurality of targets made of different materials by the double-layer rotating shutter mechanism and using the same for sputtering in a specific sequence, cross-contamination may be caused between targets. 
         [0009]    For example, sputtering includes a state of “pre-sputtering” causing a discharge to start the sputter state in the state with the target for sputtering covered by the shutter mechanism and a state of “main sputtering” completely opening the shutter mechanism to perform the sputtering on the substrate. At this time, cross-contamination will occur due to (1) deposition of different types of substances deposited on the surface of the shutter plate facing the target onto the target surface due to the sputtering action at the time of the pre-sputtering; (2) sputtering of different types of substances deposited on the target surface onto the substrate at the time of the main sputtering; (3) deposition of sputter atoms rebounding from the substrate in the middle of the main sputtering onto another target surface; and so on. When shifting from pre-sputtering to main sputtering by rotating the shutters for the pre-sputtering to shift to the main sputtering, the contamination explained in (1) occurs after locations where different types of substances are deposited are passed through during the rotation of the shutter plates. This becomes a conspicuous problem. 
         [0010]    In order to deposit a multi-layer film with good film properties on a substrate, prevention of the various cross-contaminations described above becomes indispensable. 
         [0011]    U.S. Patent Application Publication No. 2002/0064595 shows one method of operation in the double-layer rotating shutter mechanism in  FIG. 5A  and  FIG. 5B  thereof. This comprises positioning a target side first shutter plate and a substrate side second shutter plate in the initial state so as to position a hole of the second shutter plate with the target for sputtering and to position the holes of the first shutter plate away from the target for sputtering, then starting the pre-sputtering. This pre-sputtering is sputtering for removing oxides and other surface contaminants on the surface of the target. Next, the first shutter plate is rotated to align a hole thereof with the above hole of the second shutter plate to expose the target for sputtering with respect to the substrate and perform the main sputtering on the substrate. The main sputtering is the basic sputtering for the film formation. In this way, this shows an operation of the double-layer rotating shutter mechanism in the main sputtering for exposing only the target for sputtering with respect to the substrate at the time of the main sputtering to prevent the intermixture of the materials of the other targets and thereby prevent cross-contamination. 
         [0012]    As explained above, however, cross-contamination is a complex phenomenon changing in accordance with the number of targets, the number of holes, and other conditions. Various types of cross-contamination occur. Further, the method of rotation of the shutter plates of U.S. Patent Publication No. 2002/0064595 does not discuss at all how to deal with the target materials deposited on the shutter plates at the time of the pre-sputtering. As described above, the method of operation of the double-layer rotating shutter mechanism disclosed in U.S. Patent Application Publication No. 2002/0064595 is not sufficient to deal with any cross-contamination which may occur. 
         [0013]    Therefore, it is desired to provide a multi-sputtering system, provided with a plurality of targets made of different materials in a single sputtering chamber for sputtering of a multi-layer film on a substrate and provided with a double-layer rotating shutter mechanism for selecting a target for sputtering at the film formation space side of the plurality of targets, which prevents contamination of the other targets by the target substances deposited on the double-layer shutters along with the sputtering sequence of the multi-layer film by optimally controlling the sequence of the shield operation of the double-layer shutter plates. 
       OBJECTS AND SUMMARY 
       [0014]    An object of the present invention is to provide a double-layer shutter control method of a multi-sputtering system, provided with a plurality of targets in a single chamber for sputtering a multi-layer film and selecting a target by a double-layer rotating shutter mechanism, which prevents cross-contamination between targets due to the target substances etc. deposited on the shutter plates. 
         [0015]    To attain the above object, an embodiment of the double-layer shutter control method of the multi-sputtering system according to the present invention is constituted as follows. 
         [0016]    This double-layer shutter control method is a shutter control method used in a multi-sputtering system provided with at least three targets provided in a single chamber and a double-layer rotating shutter mechanism having first and second shutter plates arranged facing these targets, independently rotating, and having holes formed at predetermined positions, which selects a target for sputtering from among the at least three targets by a combination of holes of the first shutter plate and the second shutter plate and uses the selected targets for a pre-sputtering step and a main sputtering step with continuous discharge so as to deposit a film on the substrate, comprising rotating the first shutter plate so as to cover the target selected by the first shutter plate and expose it to the substrate through the second shutter plate at the pre-sputtering step and so as to expose the selected target with respect to the substrate through the first shutter plate at the main sputtering step and controlling the rotation operation of the first shutter plate so that, at the pre-sputtering step, a deposit at a facing location of the first shutter plate covering the selected target becomes the same substance as the substance of the selected target and so that the position of the first shutter plate for the pre-sputtering becomes a position adjacent to a hole of the shutter plate. 
         [0017]    That is, the above double-layer shutter control method covers the specific target selected for sputtering and the other targets by the first shutter plate at the time of the pre-sputtering and rotates the first shutter plate to expose the selected target with respect to the substrate side through one hole at the time of the main sputtering. In the rotation operation of the first shutter plate near the target at the time of the pre-sputtering and at the time of the main sputtering, since substances of a plurality of targets are deposited onto the surface of the first shutter plate on the target side at the time of the discharge in the pre-sputtering, the rotation operation of the first shutter plate is controlled so that a location where substances of other targets are deposited does not face the front of the selected target during the pre-sputtering and when shifting from the pre-sputtering to the main sputtering. Due to this, the deposition of other target substances onto the surface of the target for sputtering at the time of the pre-sputtering can be prevented and cross-contamination at the time of the main sputtering can be prevented. 
         [0018]    This double-layer shutter control method is preferably a method of controlling the rotation operations of the first shutter plate and the second shutter plate so that a location at the first shutter plate where a substance different from that of the selected target was deposited at the time of a previous discharge is not faced during discharge of the selected target. When the first shutter plate rotates at the time of discharge in the pre-sputtering step etc., cross-contamination can be avoided so long as other target substances deposited on the first shutter plate do not pass through a location facing the target selected for sputtering. When rotating the shutters for the pre-sputtering to shift to the main sputtering in order to shift from the pre-sputtering to the main sputtering, the contamination explained in the above (1) occurs when passing through a location where different types of substances are deposited during the rotation of the shutter plate. This becomes a conspicuous problem. 
         [0019]    This double-layer shutter control method preferably exposes only a selected target through holes of the first and second shutter plates when seen from the substrate at the time of the main sputtering. When performing the main sputtering, the selected target is used for sputtering, whereby particles of the sputtered target substance move toward the substrate through holes of the first shutter plate and the second shutter plate and deposit on the surface of the substrate. 
         [0020]    This double-layer shutter control method preferably exposes one selected target in the case of single sputtering. In the case of single sputtering, only the substance given by one target is deposited on the substrate, so one selected target can be seen through the holes of the first and second shutter plates when seen from the substrate side. 
         [0021]    This double-layer shutter control method alternatively preferably exposes at least two selected targets in the case of co-sputtering. In the case of co-sputtering, a film is deposited on the substrate by simultaneous sputtering of two types of targets made of different substances, so at least two selected targets can be seen through the holes of the first and second shutter plates when seen from the substrate side. 
         [0022]    This double-layer shutter control method preferably sets the number of holes of the first shutter plate at n/2 when the number of the plurality of targets is an even number (n: n&gt;3). 
         [0023]    This double-layer shutter control method alternatively preferably sets the number of holes of the first shutter plate at (n/2)+1 when the number of the plurality of targets is an odd number (n: 1≧3). 
         [0024]    According to another embodiment of the invention, there is provided a double-layer shutter control method of a multi-sputtering system provided with five different types of targets provided in a chamber and a double-layer rotating shutter mechanism having first and second shutter plates arranged facing the five targets, independently rotating, and each having two holes formed therein, which suitably selects one or two targets for sputtering from among the five targets by a combination of holes of the first shutter plate and the second shutter plate and uses the selected targets for a pre-sputtering step and a main sputtering step with continuous discharge so as to deposit a film on the substrate for co-sputtering or single sputtering, comprising operating the first and second shutter plates so that, in the co-sputtering and single sputtering, the same target substances are deposited at the same locations as deposition of films on the first and second shutter plates due to the pre-sputtering step and thereby performing the co-sputtering and the single sputtering in a single chamber system. 
         [0025]    The above double-layer shutter control method forms deposits obtained by the same substances at the same locations of the first shutter plate and the second shutter plate at each of the time of the pre-sputtering step of the co-sputtering and the time of the pre-sputtering step of the single sputtering in a single sputtering chamber, whereby it becomes possible to perform the co-sputtering and single sputtering without cross-contamination. 
         [0026]    This double-layer shutter control method preferably controls operations of the first and second shutter plates so as to give priority to the co-sputtering between the co-sputtering and the single sputtering. 
         [0027]    This double-layer shutter control method alternatively first executes the co-sputtering, then executes the single sputtering. 
         [0028]    This double-layer shutter control method preferably exposes only the selected target through the holes of the first and second shutter plates when seen from the substrate at the time of the main sputtering. 
         [0029]    As described above, according to an embodiment of the present invention, there is provided a control method of a double-layer shutter mechanism enabling independent rotation of shutter plates with respect to a plurality of targets arranged in a single chamber of a multi-sputtering system which controls the rotation operation of the first shutter plate near the target at the time of the pre-sputtering and the time of the main sputtering so that substances of a plurality of targets are deposited on the surface of the first shutter plate on the target side during the discharge of the pre-sputtering, but there is no location where substances of other targets are deposited in front of the target selected for sputtering during the discharge of the pre-sputtering and when maintaining the discharge state and shifting from the pre-sputtering to the main sputtering, and controlling the rotation operation of the shutter plates so that locations of different types of deposited substances are not passed through at the time of shifting from the pre-sputtering to the main sputtering by switching the movement of the first and second shutter plates. Due to this, the deposition of another target substance onto the surface of a target at the time of the pre-sputtering can be prevented, and cross-contamination at the time of the main sputtering can be prevented. 
         [0030]    Further, according to an embodiment of the present invention, co-sputtering and single sputtering can be carried out by suitable procedures by a single common system configuration in a sputtering system provided with five targets in a single sputtering chamber and provided with a double-layer rotating shutter mechanism having a first shutter plate and a second shutter plate each having two holes at predetermined angles and suitably controlling the rotation of these independently. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0031]    These and other objects and features of the present invention will become clearer from the following description of the preferred embodiments given with reference to the accompanying drawings, in which: 
           [0032]      FIG. 1  is a plan view of a magnetic multi-layer film-forming system to which an embodiment of the present invention is applied; 
           [0033]      FIG. 2A  is a plan view of the state of arrangement of a plurality of targets in a single sputtering chamber of the magnetic multi-layer film-forming system; 
           [0034]      FIG. 2B  is a vertical sectional view of the sputtering chamber; 
           [0035]      FIG. 3  is a view of the disassembled configuration showing a representative configuration of the double-layer rotating shutter mechanism; 
           [0036]      FIG. 4  is a view of the configuration showing the configuration of a control device for controlling the rotation operation of the double-layer rotating shutter mechanism; 
           [0037]      FIG. 5  is a view for explaining the cross-contamination regarded as the problem in the present invention; 
           [0038]      FIGS. 6A and 6B  are views for explaining a basic operation of the double-layer shutter control method according to an embodiment of the present invention; 
           [0039]      FIGS. 7A and 7B  are views for explaining basic operations at the time of pre-sputtering and the time of main sputtering of the double-layer shutter control method according to the present invention; 
           [0040]      FIG. 8  is a view of the arrangement of targets of a first embodiment of the double-layer shutter control method according to an embodiment of the present invention; 
           [0041]      FIGS. 9A and 9B  are views of the arrangement of holes of first and second shutter plates of the first embodiment of the double-layer shutter control method; 
           [0042]      FIGS. 10A through 10D  are a state transition diagrams showing the change of positions of the first and second shutter plates of the first embodiment of the double-layer shutter control method; 
           [0043]      FIGS. 11A and 11B  are a state transition diagrams showing the positional relationships of targets for sputtering and the first and second shutter plates at the time of the main sputtering; 
           [0044]      FIG. 12  is a view of the arrangement of targets of a second embodiment of the double-layer shutter control method according to the present invention; 
           [0045]      FIGS. 13A and 13B  are views of the arrangement of holes of the first and second shutter plates of the second embodiment of the double-layer shutter control method; 
           [0046]      FIG. 14A  is a state transition diagram showing the change of positions of the first and second shutter plates when co-sputtering using targets T 1  and T 3  in the second embodiment; 
           [0047]      FIG. 14B  is a state transition diagram showing the change of positions of the first and second shutter plates when co-sputtering using targets T 2  and T 4  in the second embodiment; 
           [0048]      FIG. 14C  is a state transition diagram showing the change of positions of the first and second shutter plates when co-sputtering using targets T 1  and T 4  in the second embodiment; 
           [0049]      FIG. 14D  is a state transition diagram showing the change of positions of the first and second shutter plates when co-sputtering using targets T 2  and T 5  in the second embodiment; 
           [0050]      FIG. 15A  is a state transition diagram showing the change of positions of the first and second shutter plates when single sputtering using the target T 1  in a third embodiment of the double-layer shutter control method according to the present invention; 
           [0051]      FIG. 15B  is a state transition diagram showing the change of positions of the first and second shutter plates when single sputtering using the target T 2  in the third embodiment; 
           [0052]      FIG. 15C  is a state transition diagram showing the change of positions of the first and second shutter plates when single sputtering using the target T 3  in the third embodiment; 
           [0053]      FIG. 15D  is a state transition diagram showing the change of positions of the first and second shutter plates when single sputtering using the target T 4  in the third embodiment; 
           [0054]      FIG. 15E  is a state transition diagram showing the change of positions of the first and second shutter plates when single sputtering using the target T 5  in the third embodiment; 
           [0055]      FIG. 16  is a view of the arrangement of targets of a fourth embodiment of the double-layer shutter control method according to the present invention; 
           [0056]      FIGS. 17A and 17B  are views of the arrangement of holes of the first and second shutter plates of the fourth embodiment of the double-layer shutter control method; 
           [0057]      FIGS. 18A through 18E  are a state transition diagrams showing the change of positions of the first and second shutter plates at the time of the main sputtering of the fourth embodiment of the double-layer shutter control method; 
           [0058]      FIG. 19  is a view of the arrangement of targets of a fifth embodiment of the double-layer shutter control method according to the present invention; 
           [0059]      FIGS. 20A and 20B  are views view of the arrangement of holes of the first and second shutter plates of the fifth embodiment of the double-layer shutter control method; 
           [0060]      FIGS. 21A and 21B  are a state transition diagrams showing the change of positions of the first and second shutter plates at the time of the main sputtering of the fifth embodiment of the double-layer shutter control method; 
           [0061]      FIG. 22  is a view of the arrangement of targets of a sixth embodiment of the double-layer shutter control method according to the present invention; 
           [0062]      FIGS. 23A and 23B  are views view of the arrangement of holes of the first and second shutter plates of the sixth embodiment of the double-layer shutter control method; 
           [0063]      FIGS. 24A through 24E  are a state transition diagrams showing the change of positions of the first and second shutter plates at the time of the main sputtering of the sixth embodiment of the double-layer shutter control method; and 
           [0064]      FIG. 25  is a table showing relationships between a number of targets and a number of holes of the first and second shutter plates. 
       
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0065]    Below, preferred embodiments of the present invention will be described with reference to the accompanying drawings. First, an embodiment of the multi-sputtering system to which the double-layer shutter control method according to the present invention is applied will be shown by referring to  FIG. 1 . This multi-sputtering system is a system for preparing a multi-layer film by sputtering. In this example, an example of a magnetic multi-layer film is shown as the multi-layer film.  FIG. 1  is a plan view shown to an extent showing the schematic configuration of the internal mechanism of the magnetic multi-layer film-forming system. This magnetic multi-layer film-forming system  10  is a cluster type provided with a plurality of film-forming chambers. A carrier chamber  12  provided with a robot transporter  11  at the center position. The robot transporter  11  is provided with an arm  13  which is freely extended or retracted and a hand  14  for carrying the substrate. The base end of the arm  13  is rotatably attached to a center portion  12   a  of the carrier chamber  12 . 
         [0066]    The carrier chamber  12  of the magnetic multi-layer film-forming system  10  is provided with load/unload chambers  15  and  16 . The load/unload chamber  15  enables the substrate to be processed to be loaded into the magnetic multi-layer film-forming system  10  from the outside and enables the substrate finished being formed with the magnetic multi-layer film to be unloaded from the magnetic multi-layer film-forming system  10 . The load/unload chamber  16  has the same functions. The substrate loaded through the load/unload chamber  16  is unloaded from the same chamber. The reason for providing two load/unload chambers is to raise the productivity by alternately using two chambers. 
         [0067]    This magnetic multi-layer film-forming system  10  is provided with three film-forming chambers  17 A,  17 B, and  17 C, one oxide film-forming chamber  18 , and one cleaning chamber  19  around the carrier chamber  12 . A gate valve  20  which separates two chambers and can be freely opened or closed according to need is provided between each two chambers. Note that each chamber is equipped with a vacuum exhaust mechanism, a material gas introduction mechanism, a power supply mechanism, etc., but the illustration of them is omitted. 
         [0068]    Each of the film-forming chambers  17 A,  17 B, and  17 C is a chamber for continuously forming films for a plurality of magnetic films belonging to the same group in the same chamber. This embodiment is configured to divide the component films of the magnetic multi-layer film to be deposited on the substrate into for example the three groups A, B, and C from the bottom side and deposit the plurality of magnetic films for each group in one common film-forming chamber. This results in a cluster type magnetic multi-layer film-forming system. Each of the film-forming chambers  17 A,  17 B, and  17 C depositing the plurality of magnetic films divided into the groups by A, B, and C and belonging to the same group deposits the magnetic films by physical vapor deposition (PVD) utilizing sputtering. 
         [0069]    The film-forming chamber  17 A for forming the magnetic films belonging to the group A continuously deposits each of for example four types of magnetic films in a predetermined sequence. For this reason, the film-forming chamber  17 A is provided with four targets  23  to  26  corresponding to the four types of magnetic materials attached to the ceiling for a substrate  22  arranged on a substrate holder  21  at the center of the bottom portion. Note that, in  FIG. 1 , the illustration of the vacuum exhaust mechanism for making the inside of the film-forming chamber  17 A a vacuum state, the mechanism for supplying the power required for sputtering of the targets  23  to  26 , the mechanism for generating plasma, and other mechanisms is omitted. The same is also true for the other film-forming chambers. 
         [0070]    The film-forming chamber  17 B for forming the magnetic films belonging to the group B continuously deposits the different plurality of types of magnetic films in a predetermined sequence. In the same way as the above description, it is provided with the targets  29  to  32  corresponding to the various types of magnetic material attached to the ceiling for a substrate  28  arranged on a substrate holder  27  at the center of the bottom portion. 
         [0071]    The film-forming chamber  17 C for forming magnetic films belonging to the group C, in the same way as the above description, is provided with targets  35  to  38  corresponding to the various types of magnetic materials attached to the ceiling for the substrate  34  arranged on a substrate holder  33  at the center of the bottom portion. 
         [0072]    The oxide film-forming chamber  18  performs a surface chemical reaction for oxidizing a metal layer. In the oxide film-forming chamber  18 ,  39  is a substrate holder, and  40  is a substrate. 
         [0073]    The cleaning chamber  19  is provided with an ion beam etching mechanism and an RF sputtering mechanism and flattens the surface of the substrates. In the cleaning chamber  19 ,  41  is a substrate holder, and  42  is a substrate. 
         [0074]    In the magnetic multi-layer film-forming system  10  having the above configuration, a substrate  43  loaded into the system through the load/unload chamber  15  is successively introduced into each of the film-forming chambers  17 A,  17 B, and  17 C, the oxide film-forming chamber  18 , and the cleaning chamber  19  by the robot transporter  11  in a previously determined sequence in accordance with the magnetic multi-layer film device to be prepared. Predetermined treatment such as film formation and etching are carried out in the chambers. 
         [0075]    Next, the characterizing structures provided in each of the film-forming chambers  17 A to  17 C will be explained in more detail by referring to  FIGS. 2A and 2B .  FIG. 2A  is a plan view of the film-forming chamber  17 C as an example, while  FIG. 2B  is a vertical sectional view showing the characterizing structure. In  FIGS. 2A and 2B , the same notations are assigned to components substantially the same as the components explained in  FIG. 1 . 
         [0076]    A ceiling  52  of a vessel  51  of the film-forming chamber  17 C is provided with four targets  35  to  38  as explained above. These targets  35  to  38  are attached in an inclined state at the ceiling  52 . In this illustrated example, for convenience of the explanation, the targets themselves are shown as  35  to  38 , but actual targets are accommodated in target housings having openings in the surfaces facing the substrate side. 
         [0077]    The substrate holder  33  rotatably provided at the center of the bottom surface of the film-forming chamber  17 C carries a substrate  34  in a horizontal state. At the time of sputtering onto the substrate  34 , the substrate  34  is rotating. Note that a ring-like magnet  53  is disposed around the substrate  34  on the substrate holder  33 . The targets  35  to  38  provided inclined are arranged to face the upper surface of the substrate  34  horizontally arranged beneath them. A double-layer rotating shutter mechanism  54  is arranged between these targets and the substrate  34 . The double-layer rotating shutter mechanism  54  has a double-layer structure of independently rotating shutter plates. The shutter mechanism  54  is operated to select the target for sputtering among the four targets  35  to  38 . By such a configuration, oblique incidence of the sputtered target substance is realized, a high uniform film thickness distribution is achieved in the formation of the multi-layer film, and contamination between targets and contamination between magnetic films are prevented. 
         [0078]    The structure and operation of the double-layer rotating shutter mechanism  54  will be conceptually explained in more detail by referring to  FIG. 3 . This figure shows a state of four targets  35  to  38  arranged in parallel for simplifying the explanation. The double-layer rotating shutter mechanism  54  is provided so that two shutter plates  61  and  62  are arranged substantially parallel and they can be individually freely rotated around a shaft  63 . In  FIG. 2B , the targets  35  to  38  and the shutter plate of the double-layer rotating shutter mechanism  54  are arranged inclined in posture, but they are positioned parallel to each other, therefore  FIG. 3  is shown taking note of this point. 
         [0079]    In the double-layer rotating shutter mechanism  54 , the shutter plate  61  is the target side shutter plate (first shutter plate), and the shutter plate  62  is the substrate side shutter plate (second shutter plate). The shutter plate  61  is formed with two holes  61   a  and  61   b  arranged in for example the diameter direction, while the shutter plate  62  is formed with for example one hole  62   a . The numbers and positions of the holes are just one example. The present invention is not limited to these as will be explained later. 
         [0080]    In the state shown in  FIG. 3 , the positions of the hole  61   a  of the shutter plate  61  and the hole  62   a  of the shutter plate  62  are aligned with the target  38  for sputtering utilizing the target  38  so as to deposit a predetermined magnetic film on the surface of the rotating substrate  34 . At this time, the targets  36  and  37  are covered by the two shutter plates  61  and  62  to prevent deposition of the sputtered target substance. Further, the target  35  faces the hole  61   b  in the shutter plate  61 , but is covered by the shutter plate  62 , so is protected in the same way as above. As described above, according to the shutter plates  61  and  62  of the double-layer rotating shutter mechanism  54 , when seen in the direction of the target from the substrate  34 , only one target is exposed at the time of the sputtering. The targets not used for sputtering are covered by the shutter plates, so in this sense cross-contamination between targets is basically prevented. 
         [0081]    In the multi-sputtering system explained in  FIGS. 1 ,  2 A,  2 B, and  3 , the example of providing four targets in each of the film-forming chambers  17 A to  17 C was explained, but the number of targets provided in a film-forming chamber is not limited to four and may be for example five or three as well. When the number of targets is five, the numbers of the holes formed in the shutter plates  61  and  62  of the double-layer rotating shutter mechanism  54  are suitably selected in accordance with the film-forming conditions. For example, the two shutter plates  61  and  62  are formed with two holes. 
         [0082]    Further, in the multi-sputtering system, each layer of the multi-layer film deposited on the substrate  34  is formed by a single target substance by a single target, that is, single sputtering. A film may also be deposited, however, by using for example shutter plates  61  and  62  each formed with two holes and using two types of targets to deposit a mix of different target substances (also referred to as “co-sputtering”). 
         [0083]    Next, an embodiment of a double-layer shutter control method performed in a multi-sputtering system will be explained in detail. In the following explanation, the numbers and notations of the above targets will be suitably explained apart from the configuration of the multi-sputtering system explained above. 
         [0084]    This double-layer shutter control method is designed to prevent the cross-contamination occurring in the complex relationship of the pre-sputtering and main sputtering etc. in addition to the basic action for preventing cross-contamination explained above. This double-layer shutter control method moves the two shutter plates  61  and  62  of the double-layer rotating shutter mechanism  54  explained above to select the target to be used according to the film-forming sequence of the multi-layer film to be formed on the substrate  34  and, at the same time, to prevent sputtering using a certain target from contaminating the other targets due to the state of discharge of the pre-sputtering and the state of discharge of the main sputtering during movement, that is, cross-contamination. 
         [0085]    The double-layer shutter control method described above is executed by independently controlling the rotation operations of the shutter plates  61  and  62  of the double-layer rotating shutter mechanism  54  by a controller  71  as shown in  FIG. 4 . The double-layer rotating shutter mechanism  54  is provided with drive units  72  and  73  for driving two shutter plates  61  and  62 . The controller  71  individually controls the operations of the drive units  72  and  73 . Shafts  74  and  75  of the shutter plates  61  and  62  are formed by for example a co-axial structure. 
         [0086]    Here, referring to  FIG. 5 , the phenomenon of the cross-contamination to be prevented by the double-layer shutter control method according to the present invention will be explained in more detail from the viewpoint of the phenomenon of deposition of the target substances on the shutter plates  61  and  62 . In  FIG. 5 , (A) shows the time of the pre-sputtering, and (B) shows the time of the main sputtering. In  FIG. 5 ,  81  is the target used for the sputtering, while  82  is another target not used for the sputtering located at the adjacent position. At the time of the pre-sputtering, the hole  62   a  of the shutter plate  62  is aligned with the target  81 , then the target  81  is covered by the shutter plate  61 . In this state, discharge is caused for the pre-sputtering. Note that, the power is not turned on and discharge is not caused for the target not used for the sputtering. In this example, the shutter plate  61  is formed with the two holes  61   a  and  61   b , and the shutter plate  62  is formed with the two holes  62   a  and  62   b.    
         [0087]    In the operation of the double-layer rotating shutter mechanism  54  in conventional multi-sputtering, at the time of the pre-sputtering (A), since a state occurred where a substance  91  of the other target was deposited on the surface of the shutter plate  61  facing the target  81  (shutter deposit) due to for example the previous sputter operation, the target substance  91  was used for sputtering by the discharge at the time of the pre-sputtering and deposited onto the surface of the target  81 . Accordingly, at the time of the main sputtering (B), the other target substance  91  deposited on the surface of the target  81  ends up being deposited on the surface of the substrate  34 , so cross-contamination occurred. In (A), the shutter  61  is stationary since it is the time of pre-sputtering, but when shifting from (A) to (B), the same phenomenon also occurs when rotating and moving the shutter  61 . Namely, the target  81  is subjected to continuous discharge from the pre-sputtering to the main sputtering, therefore, when a substance different from that of the target  81  is passed during rotation of the shutter  62 , the same phenomenon as the above cross-contamination occurs. Further, the other target substance  91  and the substance  81  deposited on the substrate  34  are sometimes deposited on the adjacent target  82  through for example an opening portion  92 . In this way, other cross-contamination also occurs. Note that,  93  is the shutter deposit of the other target. 
         [0088]    The double-layer shutter control method according to the present invention is designed to prevent the above cross-contamination and will be explained in detail in the following embodiments. 
         [0089]    One of the basic ideas of the double-layer shutter control method of the present invention is to cover the target by a location of the shutter plate where a target substance the same as that of the above target is deposited in the pre-sputtering immediately before the main sputtering (or to prevent a location where another different target substance is deposited from arriving a facing location during the shutter rotation operation) when using a certain target (for example, the target  81 ) for sputtering. According to another idea of the invention, a deposition prevention plate may be utilized to eliminate deposition of target substances at the peripheries of the holes of the shutter plate. Due to this, even if shutter deposit forms on the surface of the shutter plate at the target side at the time of pre-sputtering or even if the target for sputtering is formed with a deposit at the time of the main sputtering, since it is a material of the same type, the film deposited on the substrate is held at a high quality. 
         [0090]    The basic configuration of the double-layer shutter control method according to the present invention will be explained next by referring to  FIG. 6  and  FIG. 7 . 
         [0091]    First, an explanation will be given of the phenomenon of deposition of the target substances on the shutter plates  61  and  62  in the double-layer shutter control method according to the present invention by referring to  FIG. 6 . In  FIG. 6 , (A) shows the time of pre-sputtering, and (B) shows the time of main sputtering. In  FIG. 6 ,  81  is the target for the sputtering. In this multi-sputtering system, a deposition prevention plate  94  is arranged in the vicinity of the target surface of the target  81 . The deposition prevention plate  94  is a member formed with a hole  94   a , shields the space around the target  81 , and exposes the target sputtering surface to the substrate side through the hole  94   a . At the time of the pre-sputtering, the hole  62   a  of the shutter plate  62  is aligned with the target  81 , and the target  81  is covered by the shutter plate  61 . The pre-sputtering is carried out in this state. Based on the method of control explained later, a substance  81 A of the target  81  is deposited on the facing surface of the shutter plate  61 . Even if the target  81  is used for pre-sputtering, the same target substance is deposited onto the facing surface, so contamination does not occur. Further, at the time of main sputtering, the hole  61   a  of the shutter plate  61  is aligned with the target  81  as shown in (B) of  FIG. 6 , so the substance  81 A of the target  81  is deposited onto the surface of the substrate  34 . In this case as well, since the surface of the target  81  was not contaminated at the time of the pre-sputtering, cross-contamination does not occur. In  FIG. 6 , since the deposition prevention plate  94  is provided, the deposition of the target deposit on the peripheral edge  61   a - 1  of the hole  61   a  can be prevented. 
         [0092]    Next, referring to  FIG. 7 , an explanation will be given of a situation the same as the situation explained in  FIG. 5  in the case of sputtering according to the present invention. In  FIG. 7 , the same notations are assigned to components substantially the same as the components explained in  FIG. 5 . The difference between the case of  FIG. 7  and the case of  FIG. 5  is that the same substances  81   a  and  82   a  are deposited at locations facing the targets  81  and  82  at the stage of the pre-sputtering when using the target  81  for sputtering to form a film of the substance of the target  81  on the substrate  34 . Further, only locations where the same substance is deposited are passed. Further, the target deposit is not deposited at the peripheral edge  61   a - 1  of the hole  61   a . Still further, the stationary position of the shutter plate  62  differs. In the case of  FIG. 5 , at the time of the pre-sputtering, the hole  62   a  is aligned with the target  81  and the hole  62   b  is aligned with the target  82 , but in the case of  FIG. 7 , at the time of the pre-sputtering, the hole  62   b  is aligned with the target  81  and the target  82  is covered. Therefore, according to the case of the sputtering of the present invention shown in  FIG. 7 , all of the cross-contamination explained in  FIG. 5  can be reliably prevented. 
         [0093]    When preventing the cross-contamination explained in  FIG. 6  and  FIG. 7  in sputtering utilizing the double-layer rotating shutter mechanism  54 , the particularly important point is that a target substance the same as that of the target  81  is deposited on the location of the surface of the shutter plate  61  or the shutter plate  62  facing the target at the time of the pre-sputtering immediately before the main sputtering in sputtering using the target  81 . When selecting a certain target among the plurality of targets for sputtering, the same substance is deposited at the location of the shutter plate  61  covering the selected target at the time of the pre-sputtering before the main sputtering. Namely, in order to create a relationship not depositing another target substance and in order to create a relationship not allowing a substance deposited by another target to pass in front of a certain target in the discharge state when shifting from pre-sputtering to main sputtering, the double-layer shutter control method explained below is used to control the rotation operations of the two shutter plates  61  and  62  of the double-layer rotating shutter mechanism  54 . 
         [0094]    Below, an explanation will be given of some typical embodiments of the method of control of the double-layer shutter mechanism in accordance with the number of the targets and the type of the sputtering (single sputtering and co-sputtering) according to the present invention. 
       First Embodiment 
       [0095]    An explanation will be given of a first embodiment of the double-layer shutter control method by referring to  FIG. 8  to  FIG. 11 . This first embodiment shows an example of four targets and single sputtering using a first shutter plate having two holes and a second shutter plate having one hole. The double-layer shutter control method according to the first embodiment is for the configuration of the system shown in  FIG. 1  to  FIG. 3 . In  FIG. 8  and  FIG. 9 , for convenience for conceptually explaining the embodiment, the four targets are indicated by the notations T 1  to T 4 , the two holes of the first shutter plate  61  facing the target are indicated by the notations H 1  and H 2 , and the single hole of the second shutter plate  62  on the substrate side is indicated by the notation H 3 . 
         [0096]    The targets T 1  to T 4  correspond to the targets  35  to  38  shown in  FIG. 3 , the holes H 1  and H 2  correspond to the holes  61   a  and  61   b , and the hole H 3  corresponds to the hole  62   a . In the first shutter plate  61 , the two holes H 1  and H 2  are formed at positions 180° apart. Further, in  FIG. 8  and  FIG. 9 , the circles  101  indicate the paths of movement of the holes H 1  to H 3  when the two shutter plates  61  and  62  rotate. 
         [0097]    (A) to (D) of  FIG. 10  show the positions of the rotation movement of the first shutter plate  61  and the second shutter plate  62  when sequentially using the four targets T 1  to T 4  for the main sputtering in the sequence of T 1 , T 2 , T 3 , and T 4 . In the following explanation, assume that the step of the pre-sputtering for a certain target is carried out before the step of the main sputtering. Further, power for the pre-sputtering and the main sputtering is supplied from the power source for every target for sputtering. The targets (T 1  to T 4 ) indicated by the hatched blocks in  FIG. 10  are supplied with power and are in the discharge state, while the other targets indicated by simple blank blocks are not supplied with power and are in the non-discharge state. The meaning of the blocks representing the targets (T 1  to T 5 ) is the same in all embodiments explained below. Note that, in the first embodiment, in actuality, there are also cases performing the main sputtering by other sequences different from the sequence of T 1 , T 2 , T 3 , and T 4 . 
         [0098]    (A) of  FIG. 10  shows a state of using the target T 1  for the main sputtering. A deposit T 1   a  deposited on the surface of the first shutter plate  61  is comprised of the substances of the target T 1  deposited at the stage of pre-sputtering before that. 
         [0099]    In  FIG. 11 , as an example, the relationship between the pre-sputtering (A) and the main sputtering (B) is shown for the target T 1 . Control is performed so that the hole H 3  of the second shutter plate  62  is aligned with the target T 1  and the first shutter plate  61  is covered at the time of the pre-sputtering. When shifting from the pre-sputtering to the main sputtering, the first shutter plate  61  rotates as indicated by an arrow  63  so that the hole H 1  is aligned with the target T 1  to expose the target T 1  with respect to the substrate  34 . In this state, at the location of the first shutter plate  61  facing the target T 1 , there is only the deposit T 1   a  formed by depositing the same substance. 
         [0100]    Accordingly, as shown in (A) of  FIG. 10 , the rotation operation of the first shutter plate  61  is controlled so that the location of the deposit T 1   a  faces the target T 1  at the time of the pre-sputtering. In the main sputtering for the target T 1 , the hole H 3  of the second shutter plate  62  is aligned with the target T 1  at the time of the pre-sputtering, then the first shutter plate  61  on which the deposit T 1   a  is deposited is rotated so that the hole H 1  thereof is aligned with the target T 1 . Due to this, the hole H 1  of the first shutter plate  61  and the hole H 3  of the second shutter plate  62  are aligned to expose the target T 1  with respect to the substrate  34  and perform the main sputtering. In the above description, only the deposit T 1   a  passes through a location frontally facing the target T 1  due to the rotation operation of the first shutter plate  61  from the pre-sputtering state to the main sputtering state while maintaining the discharge state. For this reason, cross-contamination can be prevented. Note that no other target substance passes through a location frontally facing the target T 1  due to the rotation operation of the first shutter plate  61  from the pre-sputtering state to the main sputtering state. 
         [0101]    (B) of  FIG. 10  shows the state of next using the target T 2  for the main sputtering. Deposits T 1   a  and T 2   a  deposited on the surface of the first shutter plate  61  are comprised of the substances of the targets T 1  and T 2  deposited at stages of pre-sputtering etc. before that. When using the target T 2  for the main sputtering, the hole H 3  of the second shutter plate  62  is aligned with the target T 2  at the time of the pre-sputtering, then the first shutter plate  61  on which the deposits T 1   a  and T 2   a  are deposited is rotated so that the hole H 1  is aligned with the target T 2 . Due to this, the hole H 1  of the first shutter plate  61  and the hole H 3  of the second shutter plate  62  are aligned to expose the target T 2  with respect to the substrate and perform the main sputtering. In the above description, only the deposit T 2   a  passes through a location frontally facing the target T 2  due to the rotation operation of the first shutter plate  61  from the pre-sputtering state to the main sputtering state while maintaining the discharge state. No other target substance passes through it. For this reason, cross-contamination can be prevented at the target T 2  and the other targets T 1 , T 3 , and T 4 . 
         [0102]    (C) of  FIG. 10  shows the state of next using the target T 3  for the main sputtering. Deposits T 1   a , T 2   a , and T 3   a  deposited on the surface of the first shutter plate  61  are comprised of substances of the targets T 1  to T 3  deposited at stages of pre-sputtering etc. before that. When using the target T 3  for the main sputtering, the hole H 3  of the second shutter plate  62  is aligned with the target T 3  at the time of the pre-sputtering, then the first shutter plate  61  on which the deposits T 1   a  to T 3   a  are deposited is rotated so that the hole H 2  thereof is aligned with the target T 3 . Due to this, the hole H 2  of the first shutter plate  61  and the hole H 3  of the second shutter plate  62  are aligned to expose the target T 3  with respect to the substrate and perform the main sputtering. In the above description, only the deposit T 3   a  passes through a location frontally facing the target T 3  due to the rotation operation of the first shutter plate  61  from the pre-sputtering state to the main sputtering state while maintaining the discharge state. No other target substance passes through it. For this reason, the above cross-contamination can be prevented at the target T 3  and the other targets T 1 , T 2 , and T 4 . 
         [0103]    (D) of  FIG. 10  shows the state of next using the target T 4  for the main sputtering. Deposits T 1   a , T 2   a , T 3   a , and T 4   a  deposited on the surface of the first shutter plate  61  are comprised of substances of the targets T 1  to T 4  deposited at stages of pre-sputtering etc. before that. When using the target T 4  for the main sputtering, the hole H 3  of the second shutter plate  62  is aligned with the target T 4  at the time of the pre-sputtering, then the first shutter plate  61  on which the deposits T 1   a  to T 4   a  are deposited is rotated so that the hole H 2  is aligned with the target T 4 . Due to this, the hole H 2  of the first shutter plate  61  and the hole H 3  of the second shutter plate  62  are aligned to expose the target T 4  with respect to the substrate and perform the main sputtering. In the above description, only the deposit T 4   a  passes through a location frontally facing the target T 4  due to the rotation operation of the first shutter plate  61  from the pre-sputtering state to the main sputtering state while maintaining the discharge state. No other target substance passes through it. For this reason, the above cross-contamination can be prevented at the target T 4  and the other targets T 1 , T 2 , and T 3 . 
         [0104]    Next, an explanation will be given of embodiments of a double-layer shutter control method in the case of five targets and each of the first shutter plate and the second shutter plate having two holes and able to perform “single sputtering control” and “co-sputtering control” using a common system configuration of one film-forming chamber of the multi-sputtering system. In the explanation of these embodiments, an example of the co-sputtering control will be explained as a second embodiment first, then an example of single sputtering control performed after co-sputtering control will be explained as a third embodiment. 
       Second Embodiment 
       [0105]    A second embodiment of a double-layer shutter control method will be explained by referring to  FIG. 12 ,  FIG. 13 , and  FIG. 14A  to  FIG. 14D . This second embodiment shows an example of five targets, a first shutter plate and a second shutter plate each having two holes, and co-sputtering. 
         [0106]    In  FIG. 12  and  FIG. 13 , the five targets are indicated by the notations T 1  to T 5 , the two holes of the first shutter plate  61  facing the target are indicated by the notations H 11  and H 12 , and the two holes of the second shutter plate  62  on the substrate side are indicated by the notations H 13  and H 14 . The holes H 11  and H 12  in the first shutter plate  61  are formed at positions 144° apart in the clockwise direction, while the holes H 13  and H 14  in the second shutter plate  62  are formed at positions 144° apart in the clockwise direction. Further, in  FIG. 12  and  FIG. 13 , the circles  101  indicate the paths of movement of the holes H 11  to H 14  when the shutter plates  61  and  62  rotate. 
         [0107]      FIG. 14A  to  FIG. 14D  show the positions of rotation movement of the first shutter plate  61  and the second shutter plate  62  when sequentially performing the co-sputtering of the targets T 1  and T 3 , the co-sputtering of the targets T 2  and T 4 , the co-sputtering of the targets T 1  and T 4 , and the co-sputtering of the targets T 2  and T 5  based on the five targets T 1  to T 5 . In each of  FIG. 14A  to  FIG. 14D , the upper part (A) shows the state in the pre-sputtering, and the lower part (B) shows the state in the main sputtering. By the movement of the first shutter plate  61  or the second shutter plate  62  from the positions in the pre-sputtering, the system is shifted to the state for the main sputtering. 
         [0108]    Note that, in the co-sputtering for the five targets T 1  to T 5 , with the present system configuration, co-sputtering between adjacent targets is not possible due to the connection of the sputter power and the limitations of the shutter holes. Based on this rule, the four sets of co-sputtering of the targets T 1  and T 3 , the targets T 2  and T 4 , the targets T 1  and T 4 , and the targets T 2  and T 5  are carried out as described above. 
         [0109]      FIG. 14A  shows a state of using the two targets T 1  and T 3  for co-sputtering first. In an initial state, no film is deposited on either of the first shutter plate  61  or the second shutter plate  62 . For co-sputtering using the targets T 1  and T 3 , power is supplied to each of the targets T 1  and T 3  from the power source to create a discharge state only for the targets T 1  and T 3 . 
         [0110]    In  FIG. 14A , the targets T 1  and T 3  indicated by the hatched blocks are in the discharge state, while the targets T 2 , T 4 , and T 5  indicated by the blank blocks are in the non-discharge state. Based on the discharge state in the pre-sputtering, deposits T 1   a  and T 3   a  are deposited on the surface of the first shutter plate  61 . The deposits T 1   a  and T 3   a  are comprised of the substances of targets T 1  and T 3  deposited at the locations facing the targets T 1  and T 3  in the discharge state during the pre-sputtering. 
         [0111]    As shown in  FIG. 14A , at the time of the pre-sputtering, the rotation operation of the first shutter plate  61  is controlled so as to align the hole H 11  with a position between the targets T 1  and T 2  and align the hole H 12  with the targets T 3  and T 4 . Further, at the time of the pre-sputtering, the rotation operation of the second shutter plate  62  is controlled so as to align the hole H 13  with the target T 1  and align the hole H 14  with the target T 3 . There is no deposit on the surface of the second shutter plate  61 . 
         [0112]    Next, when using the targets T 1  and T 3  for sputtering, the first shutter plate  61  on which the deposits T 1   a  and T 3   a  are deposited is rotated so that the holes H 11  and H 12  are aligned with the targets T 1  and T 3 . Due to this, the hole H 11  of the first shutter plate  61  and the hole H 13  of the second shutter plate  62  are aligned, the hole H 12  of the first shutter plate  61  and the hole H 14  of the second shutter plate  62  are aligned, and the target T 1  and the target T 3  are exposed with respect to the substrate to perform the main sputtering. 
         [0113]    In the above description, when the first shutter plate  61  is rotated from the pre-sputtering state to the main sputtering state while maintaining the discharge, only the deposits T 1   a  and T 3   a  pass through locations frontally facing the targets T 1  and T 3 . For this reason, the cross-contamination explained above can be prevented. 
         [0114]      FIG. 14B  shows the state of the case of next using the targets T 2  and T 4  for co-sputtering after the end of the main sputtering shown in  FIG. 14A . In this case, the targets T 2  and T 4  are in the discharge state, and the targets T 1 , T 3 , and T 5  are in the non-discharge state. Further, in this case, at the time of the pre-sputtering, the rotation operation of the first shutter plate  61  is controlled again so as to align the hole H 11  with a position between the targets T 1  and T 2  and align the hole H 12  with a position between the targets T 3  and T 4 , and the rotation operation of the second shutter plate  62  is controlled so as to align the hole H 13  with the target T 2  and align the hole H 14  with the target T 4 . There is no deposit on the surface of the second shutter plate  62 . 
         [0115]    On the surface of the first shutter plate  61 , deposits T 2   a  and T 4   a  are newly deposited by the pre-sputtering. The deposits T 1   a  to T 4   a  are comprised of substances of the targets T 1  to T 4  deposited at the previous stage of the co-sputtering and the current pre-sputtering. When using the targets T 2  and T 4  for the main sputtering, the first shutter plate  61  on which the deposits T 1   a  to T 4   a  were deposited in the state where the holes H 13  and H 14  of the second shutter plate  62  were aligned with the targets T 2  and T 4  at the time of the pre-sputtering is rotated so that the holes H 11  and H 12  are aligned with the targets T 2  and T 4 . Due to this, the holes H 11  and H 12  of the first shutter plate  61  and the holes H 13  and H 14  of the second shutter plate  62  are aligned to expose the targets T 2  and T 4  with respect to the substrate and perform the main sputtering. 
         [0116]    In the above description, when rotating the first shutter plate  61  from the pre-sputtering state to the main sputtering state while maintaining the discharge, only the deposits T 2   a  and T 4   a  pass through locations frontally facing the targets T 2  and T 4 . For this reason, the cross-contamination explained above can be prevented at the targets T 2  and T 4 . 
         [0117]      FIG. 14C  shows a state of a case of next using the targets T 1  and T 4  for co-sputtering after the end of the main sputtering shown in  FIG. 14B . In this case, the targets T 1  and T 4  are in the discharge state, while the targets T 2 , T 3 , and T 5  are in the non-discharge state. Further, in this case, at the time of the pre-sputtering, the rotation operation of the first shutter plate  61  is controlled so as to align the hole H 12  with the target T 1  and align the hole H 11  with the target T 4 , while the rotation operation of the second shutter plate  62  is controlled so as to align the hole H 14  with a position between the targets T 1  and T 2  and align the hole H 13  with a position between the targets T 4  and T 5 . Deposits T 1   a  to T 4   a  deposited on the surface of the first shutter plate  61  are comprised of the substances of the targets T 1  to T 4  deposited at the stages of the pre-sputtering etc. before that. Further, the deposits T 1   a  and T 4   a  are formed on the surface of the second shutter plate  62  by the current pre-sputtering. 
         [0118]    When using the targets T 1  and T 4  for the main sputtering, next the second shutter plate  62  on which the deposits T 1   a  and T 4   a  are deposited is rotated so that the holes H 14  and H 13  thereof are aligned with the targets T 1  and T 4 . Due to this, the holes H 12  and H 11  of the first shutter plate  61  and the holes H 14  and H 13  of the second shutter plate  62  are aligned to expose the targets T 1  and T 4  with respect to the substrate and perform the main sputtering. 
         [0119]    In the above description, when rotating the first shutter plate  61  from the pre-sputtering state to the main sputtering state while maintaining the discharge, only the deposits T 1   a  and T 4   a  pass through locations frontally facing the targets T 1  and T 4 . For this reason, the cross-contamination explained above can be prevented at the targets T 1  and T 4 . 
         [0120]      FIG. 14D  shows a state of a case of next using the targets T 2  and T 5  for co-sputtering after the end of the main sputtering shown in  FIG. 14C . In this case, the targets T 2  and T 5  are in the discharge state, while the targets T 1 , T 3 , and T 4  are in the non-discharge state. Further, in this case, at the time of the pre-sputtering, the rotation operation of the first shutter plate  61  is controlled so as to align the hole H 12  with the target T 2  and align the hole H 11  with the target T 5 , while the rotation operation of the second shutter plate  62  is controlled so as to align the hole H 14  with a position between the targets T 1  and T 2  and align the hole H 13  with a position between the targets T 4  and T 5 . Deposits T 1   a  to T 4   a  deposited on the surface of the first shutter plate  61  are comprised of substances of the targets T 1  to T 4  deposited at stages of the pre-sputtering etc. before that. Further, deposits T 2   a  and T 5   a  are formed on the surface of the second shutter plate  62  by the current pre-sputtering in addition to the deposits T 1   a  and T 4   a.    
         [0121]    When using the targets T 2  and T 5  for the main sputtering, next the second shutter plate  62  on which the deposits T 1   a , T 2   a , T 4   a , and T 5   a  are deposited is rotated so that the holes H 14  and H 13  thereof are aligned with the targets T 2  and T 5 . Due to this, the holes H 12  and H 11  of the first shutter plate  61  and the holes H 14  and H 13  of the second shutter plate  62  are aligned to expose the targets T 2  and T 5  with respect to the substrate and perform the main sputtering. 
         [0122]    In the above description, when rotating the first shutter plate  61  from the pre-sputtering state to the main sputtering state while maintaining the discharge, only the deposits T 2   a  and T 5   a  pass through locations frontally facing the targets T 2  and T 5 . For this reason, the cross-contamination explained above can be prevented at the targets T 2  and T 5 . 
       Third Embodiment 
       [0123]    Next, a third embodiment of the double-layer shutter control method will be explained by referring to  FIG. 15A  to  FIG. 15E . This third embodiment is a method of a single sputtering control using the same system configuration as that of the second embodiment explained by  FIG. 12  and  FIG. 13  which performs the single sputtering after the co-sputtering of the second embodiment. Accordingly, the double-layer shutter control method of the third embodiment shows an example of five targets, first and second shutter plates each having two holes, and single sputtering. Further, in the single sputtering according to the third embodiment, the pre-sputtering is performed utilizing the position where the film is finally deposited at the time when the final main sputtering in the second embodiment ends (the film deposition position at the time of the main sputtering of  FIG. 14D ). 
         [0124]    In  FIG. 15A  to  FIG. 15E , the five targets T 1  to T 5 , the two holes H 11  and H 12  of the first shutter plate  61  facing the targets, and the two holes H 13  and H 14  of the shutter plate  62  on the substrate side are the same as those of the case of the second embodiment. 
         [0125]      FIG. 15A  to  FIG. 15E  show the positions of rotation movement of the first shutter plate  61  and the second shutter plate  62  when sequentially perform single sputtering for the five targets T 1  to T 5  in the sequence of T 1 , T 2 , T 3 , T 4 , and T 5 . In each of  FIG. 15A  to  FIG. 15E , the upper part (A) shows the state in the pre-sputtering, and the lower part (B) shows the state in the main sputtering. 
         [0126]      FIG. 15A  shows a state of using the target T 1  for single sputtering after the end of the main sputtering shown in  FIG. 14D . In this case, the target T 1  is in the discharge state, while the targets T 2  to T 5  are in the non-discharge state. Further, in this case, at the time of pre-sputtering, the rotation operation of the first shutter plate  61  is controlled so as to align the hole H 11  with a position between the targets T 1  and T 2  and align the hole H 12  with a position between the targets T 3  and T 4 , while the rotation operation of the second shutter plate  62  is controlled so as to align the hole H 14  with the target T 1  and align the hole H 13  with the target T 4 . 
         [0127]    The deposits T 1   a , T 2   a , T 3   a , and T 4   a  deposited on the surface of the first shutter plate  61  are comprised of the substances of the targets T 1  to T 4  deposited at locations facing the targets T 1  to T 4  in the discharge state at the stage of pre-sputtering etc. as previously explained. Further, the deposits T 1   a , T 2   a , T 4   a , and T 5   a  deposited on the surface of the second shutter plate  62  are comprised of substances of the targets T 1 , T 2 , T 4 , and T 5  deposited at locations facing the targets T 1 , T 2 , T 4 , and T 5  in the discharge state at the previous stages of discharge. 
         [0128]    As shown in  FIG. 15A , at the time of the pre-sputtering, the rotation operation of the first shutter plate  61  is controlled so as to make the locations of the deposits T 1   a  to T 4   a  face the targets T 1  to T 4 . Further, at the time of the pre-sputtering, the rotation operation of the second shutter plate  62  is controlled so as to align the hole H 14  with the target T 1  and align the hole H 13  with the target T 4 . 
         [0129]    Next, when using the target T 1  for the main sputtering, next the first shutter plate  61  on which the deposits T 1   a  to T 4   a  are deposited is rotated to align the hole H 11  with the target T 1 . Due this, the hole H 11  of the first shutter plate  61  and the hole H 14  of the second shutter plate  62  are aligned to expose the target T 1  with respect to the substrate and perform the main sputtering. 
         [0130]    In the above description, when the first shutter plate  61  rotates from the pre-sputtering state to the main sputtering state while maintaining the discharge, only the deposit T 1   a  passes through a location frontally facing the target T 1 . No other target substance passes through it. For this reason, the cross-contamination explained above can be prevented. 
         [0131]      FIG. 15B  shows a state of next using the target T 2  for single sputtering after the end of the main sputtering shown in  FIG. 15A . In this case, the target T 2  is in the discharge state, while the targets T 1 , and T 3  to T 5  are in the non-discharge state. Further, in this case, at the time of the pre-sputtering, the rotation operation of the first shutter plate  61  is controlled so as to align the hole H 11  with a position between the targets T 1  and T 2  and align the hole H 12  with a position between the targets T 3  and T 4 , while the rotation operation of the second shutter plate  62  is controlled so as to align the hole H 14  with the target T 2  and align the hole H 13  with the target T 5 . 
         [0132]    The deposits T 1   a , T 2   a , T 3   a , and T 4   a  deposited on the surface of the first shutter plate  61  are comprised of the substances of the targets T 1  to T 4  deposited at stages of the pre-sputtering etc. as previously explained. When using the target T 2  for the main sputtering, the first shutter plate  61  on which the deposits T 1   a  to T 4   a  are deposited is rotated so that the hole H 11  thereof is aligned with the target T 2 . Due to this, the hole H 11  of the first shutter plate  61  and the hole H 14  of the second shutter plate  62  are aligned to expose the target T 2  with respect to the substrate and perform the main sputtering. 
         [0133]    In the above description, when the first shutter plate  61  rotates from the pre-sputtering state to the main sputtering state while maintaining the discharge, only the deposit T 2   a  passes through a location frontally facing the target T 2 . For this reason, the cross-contamination explained above can be prevented at the target T 2 . 
         [0134]      FIG. 15C  shows a state of next using the target T 3  for single sputtering after the end of the main sputtering shown in  FIG. 15B . In this case, the target T 3  is in the discharge state, while the targets T 1 , T 2 , T 4 , and T 5  are in the non-discharge state. Further, in this case, at the time of the pre-sputtering, the rotation operation of the first shutter plate  61  is controlled so as to align the hole H 11  with a position between the targets T 1  and T 2  and align the hole H 12  with a position between the targets T 3  and T 4 , while the rotation operation of the second shutter plate  62  is controlled so as to align the hole H 13  with the target T 3  and align the hole H 14  with the target T 5 . 
         [0135]    The deposits T 1   a , T 2   a , T 3   a , and T 4   a  deposited on the surface of the first shutter plate  61  are comprised of the substances of the targets T 1  to T 4  deposited at stages of the pre-sputtering etc. before that. When using the target T 3  for the main sputtering, the first shutter plate  61  on which the deposits T 1   a  to T 4   a  are deposited is rotated so that the hole H 12  thereof is aligned with the target T 3 . Due to this, the hole H 12  of the first shutter plate  61  and the hole H 13  of the second shutter plate  62  are aligned to expose the target T 3  with respect to the substrate and perform the main sputtering. 
         [0136]    In the above description, when the first shutter plate  61  rotates from the pre-sputtering state to the main sputtering state while maintaining the discharge, only the deposit T 3   a  passes through a location frontally facing the target T 3 . For this reason, the cross-contamination explained above can be prevented at the target T 3 . 
         [0137]      FIG. 15D  shows a state of next using the target T 4  for single sputtering after the end of the main sputtering shown in  FIG. 15C . In this case, the target T 4  is in the discharge state, while the targets T 1  to T 3  and T 5  are in the non-discharge state. Further, in this case, at the time of the pre-sputtering, the rotation operation of the first shutter plate  61  is controlled so as to align the hole H 11  with a position between the targets T 1  and T 2  and align the hole H 12  with a position between the targets T 3  and T 4 , while the rotation operation of the second shutter plate  62  is controlled so as to align the hole H 13  with the target T 3  and align the hole H 14  with the target T 1 . 
         [0138]    The deposits T 1   a , T 2   a , T 3   a , and T 4   a  deposited on the surface of the first shutter plate  61  are comprised of the substances of the targets T 1  to T 4  deposited at stages of the pre-sputtering etc. before that. When using the target T 4  for the main sputtering, the first shutter plate  61  on which the deposits T 1   a  to T 4   a  are deposited is rotated so that the hole H 12  thereof is aligned with the target T 4 . Due to this, the hole H 12  of the first shutter plate  61  and the hole H 13  of the second shutter plate  62  are aligned to expose the target T 4  with respect to the substrate and perform the main sputtering. 
         [0139]    In the above description, when the first shutter plate  61  rotates from the pre-sputtering state to the main sputtering state while maintaining the discharge, only the deposit T 4   a  passes through a location frontally facing the target T 4 . For this reason, the cross-contamination explained above can be prevented at the target T 4 . 
         [0140]      FIG. 15E  shows a state of next using the target T 5  for single sputtering after the end of the main sputtering shown in  FIG. 15D . In this case, the target T 5  is in the discharge state, while the targets T 1  to T 4  are in the non-discharge state. Further, in this case, at the time of the pre-sputtering, the rotation operation of the first shutter plate  61  is controlled so as to align the hole H 11  with the target T 3  and align the hole H 12  with the target T 5 , while the rotation operation of the second shutter plate  62  is controlled so as to align the hole H 13  with a position between the targets T 4  and T 5  and align the hole H 14  with a position between the targets T 1  and T 2 . 
         [0141]    The deposits T 1   a , T 2   a , T 3   a , and T 4   a  deposited on the surface of the first shutter plate  61  are comprised of the substances of the targets T 1  to T 4  deposited at the stages of the pre-sputtering etc. before that. When using the target T 5  for the main sputtering, the second shutter plate  62  is rotated so that the hole H 13  thereof is aligned with the target T 5 . Due to this, the hole H 12  of the first shutter plate  61  and the hole H 13  of the second shutter plate  62  are aligned to expose the target T 5  with respect to the substrate and perform the main sputtering. 
         [0142]    In the above description, when the second shutter plate  62  rotates from the pre-sputtering state to the main sputtering state while maintaining the discharge, only the deposit T 5   a  passes through a location frontally facing the target T 5 . For this reason, the cross-contamination explained above can be prevented at the target T 5 . 
       Fourth Embodiment 
       [0143]    Next, a fourth embodiment of the double-layer shutter control method will be explained by referring to  FIG. 16  to  FIG. 18 . In this embodiment, another example of the single sputtering for five targets will be explained. In  FIG. 16  and  FIG. 17 , the five targets are indicated by T 1  to T 5 , the holes of the first shutter plate  61  facing the targets are indicated by H 21 , H 22 , and H 23 , and the hole of the shutter plate  62  on the substrate side is indicated by H 24 . The holes H 21 , H 22 , and H 23  in the first shutter plate  61  are formed at positions 144° and 216° apart in the clockwise direction from H 21 . Further, in  FIG. 16  and  FIG. 17 , the circles  101  indicate the paths of movement of the holes H 21  to H 24  when the two shutter plates  61  and  62  rotate. 
         [0144]    (A) to (E) of  FIG. 18  show the positions of rotation movement of the first shutter plate  61  and the second shutter plate  62  in each case when sequentially using five targets T 1  to T 5  for the main sputtering in the sequence of T 1 , T 2 , T 3 , T 4 , and T 5 . In the following explanation, assume that the step of the pre-sputtering is carried out before the step of the main sputtering for a certain target. 
         [0145]    (A) of  FIG. 18  shows the state of using the target T 1  for the main sputtering. Deposits T 1   a , T 2   a , T 3   a , T 4   a , and T 5   a  deposited on the surface of the first shutter plate  61  are comprised of the substances of the targets T 1  to T 5  deposited at stages of the pre-sputtering before that. 
         [0146]    As shown in (A) of  FIG. 18 , at the time of the pre-sputtering, the rotation operation of the first shutter plate  61  is controlled so that locations of the deposits T 1   a  to T 5   a  face the targets T 1  to T 5 . 
         [0147]    When using the target T 1  for the main sputtering, at the time of the pre-sputtering, the second shutter plate  62  is rotated so as to align the hole H 24  of the second shutter plate  62  with the target T 1 , then the first shutter plate  61  on which the deposits T 1   a  to T 5   a  are deposited is rotated so that the hole H 21  is aligned with the target T 1 . Due to this, the hole H 21  of the first shutter plate  61  and the hole H 24  of the second shutter plate  62  are aligned to expose the target T 1  with respect to the substrate and perform the main sputtering. In the above description, only the deposit T 1   a  passes through a location frontally facing the target T 1  due to the rotation operation of the first shutter plate  61  from the pre-sputtering state to the main sputtering state. For this reason, the cross-contamination explained above can be prevented. Note that no other target substances will pass through locations frontally facing the other targets T 1 , T 3 , T 4 , and T 5  due to the rotation operation of the first shutter plate  61  from the pre-sputtering state to the main sputtering state. 
         [0148]    (B) of  FIG. 18  shows the state of next using the target T 2  for the main sputtering. Deposits T 1   a  to T 5   a  deposited on the surface of the first shutter plate  61  are comprised of the substances of the targets T 1  to T 5  deposited at stages of the pre-sputtering before that. When using the target T 2  for the main sputtering, at the time of the pre-sputtering, the second shutter plate  62  is rotated so as to align the hole H 24  thereof with the target T 2 , then the first shutter plate  61  on which the deposits T 1   a  to T 5   a  are deposited is rotated so that the hole H 21  thereof is aligned with the target T 2 . Due to this, the hole H 21  of the first shutter plate  61  and the hole H 24  of the second shutter plate  62  are aligned to expose the target T 2  with respect to the substrate and perform the main sputtering. In the above description, only the deposit T 2   a  passes through a location frontally facing the target T 2  due to the rotation operation of the first shutter plate  61  from the pre-sputtering state to the main sputtering state. For this reason, the cross-contamination explained above can be prevented at the target T 2 . 
         [0149]    (C) of  FIG. 18  shows the state of next using the target T 3  for the main sputtering. Deposits T 1   a  to T 5   a  deposited on the surface of the first shutter plate  61  are comprised of the substances of the targets T 1  to T 5  deposited at stages of the pre-sputtering before that. When using the target T 3  for the main sputtering, at the time of the pre-sputtering, the second shutter plate  62  is rotated so as to align the hole H 24  thereof with the target T 3 , then the first shutter plate  61  on which the deposits T 1   a  to T 5   a  are deposited is rotated so that the hole H 22  thereof is aligned with the target T 3 . Due to this, the hole H 22  of the first shutter plate  61  and the hole H 24  of the second shutter plate  62  are aligned to expose the target T 2  with respect to the substrate and perform the main sputtering. In the above description, only the deposit T 3   a  passes through a location frontally facing the target T 3  due to the rotation operation of the first shutter plate  61  from the pre-sputtering state to the main sputtering state. For this reason, the cross-contamination explained above can be prevented at the target T 3 . 
         [0150]    (D) of  FIG. 18  shows the state of next using the target T 4  for the main sputtering. Deposits T 1   a  to T 5   a  deposited on the surface of the first shutter plate  61  are comprised of the substances of the targets T 1  to T 5  deposited at stages of the pre-sputtering before that. When using the target T 4  for the main sputtering, at the time of the pre-sputtering, the second shutter plate  62  is rotated so as to align the hole H 24  thereof with the target T 4 , then the first shutter plate  61  on which the deposits T 1   a  to T 5   a  are deposited is rotated so that the hole H 22  thereof is aligned with the target T 4 . Due to this, the hole H 22  of the first shutter plate  61  and the hole H 24  of the second shutter plate  62  are aligned to expose the target T 4  with respect to the substrate and perform the main sputtering. In the above description, only the deposit T 4   a  passes through a location frontally facing the target T 4  due to the rotation operation of the first shutter plate  61  from the pre-sputtering state to the main sputtering state. For this reason, the cross-contamination explained above can be prevented at the target T 4 . 
         [0151]    (E) of  FIG. 18  shows the state of next using the target T 5  for the main sputtering. Deposits T 1   a  to T 5   a  deposited on the surface of the first shutter plate  61  are comprised of the substances of the targets T 1  to T 5  deposited at stages of the pre-sputtering before that. When using the target T 5  for the main sputtering, at the time of the pre-sputtering, the second shutter plate  62  is rotated so as to align the hole H 24  thereof with the target T 5 , then the first shutter plate  61  on which the deposits T 1   a  to T 5   a  are deposited is rotated so that the hole H 23  thereof is aligned with the target T 5 . Due to this, the hole H 23  of the first shutter plate  61  and the hole H 24  of the second shutter plate  62  are aligned to expose the target T 5  with respect to the substrate and perform the main sputtering. In the above description, only the deposit T 5   a  passes a location frontally facing the target T 5  due to the rotation operation of the first shutter plate  61  from the pre-sputtering state to the main sputtering state. For this reason, the cross-contamination explained above can be prevented at the target T 5 . 
       Fifth Embodiment 
       [0152]    Next, a fifth embodiment of the double-layer shutter control method will be explained by referring to  FIG. 19  to FIG.  21 . In this embodiment, an example of four targets and co-sputtering will be explained.  FIG. 19  corresponds to the above  FIG. 8 , while  FIG. 20  corresponds to the above  FIG. 9 . In  FIG. 19  to  FIG. 21 , the same notations are assigned to the same components as the components explained in  FIG. 8  etc. The four targets are indicated by T 1  to T 4 , the holes of the first shutter plate  61  facing the targets are indicated by H 31  and H 32 , and the holes of the second shutter plate  62  on the substrate side are indicated by H 33  and H 34 . In the first shutter plate  61 , two holes H 31  and H 32  are formed at positions 180° apart, while in the second shutter plate  62 , two holes H 33  and H 34  are formed at positions 180° apart. 
         [0153]    (A) and (B) of  FIG. 21  show the positions of rotation movement of the first shutter plate  61  and the second shutter plate  62  in the cases of sequentially using the four targets T 1  to T 4  for the main sputtering in the sequences of the combinations of the targets T 1  and T 3  and the targets T 2  and T 4 . The step of the pre-sputtering is carried out before the step of the main sputtering for a certain target. 
         [0154]    (A) of  FIG. 21  shows a state of next using the targets T 1  and T 3  for the main sputtering. Deposits T 1   a , T 2   a , T 3   a , and T 4   a  deposited on the surface of the first shutter plate  61  are comprised of the substances of the targets T 1  to T 4  deposited at stages of the pre-sputtering before that. 
         [0155]    As shown in (A) of  FIG. 21 , the rotation operation of the first shutter plate  61  is controlled so that the locations of the deposits T 1   a  to T 4   a  face to the targets T 1  to T 4  at the time of the pre-sputtering. When using the targets T 1  and T 3  for the main sputtering, at the time of pre-sputtering, the holes H 33  and H 34  of the second shutter plate  62  are aligned with the targets T 1  and T 3 , then the first shutter plate  61  on which the deposits T 1   a  to T 4   a  are deposited is rotated so that the holes H 31  and H 32  thereof are aligned with the targets T 1  and T 3 . Due to this, the holes H 31  and H 32  of the first shutter plate  61  and the holes H 33  and H 34  of the second shutter plate  62  are aligned to expose the targets T 1  and T 3  with respect to the substrate and perform the main sputtering. In the above description, only the deposits T 1   a  and T 3   a  pass through locations frontally facing the targets T 1  and T 3  due to the rotation operation of the first shutter plate  61  from the pre-sputtering state to the main sputtering state. For this reason, the cross-contamination explained above can be prevented. 
         [0156]    (B) of  FIG. 21  shows a state of next using the targets T 2  and T 4  for the main sputtering. The deposits T 1   a  to T 4   a  deposited on the surface of the first shutter plate  61  are comprised of the substances of the targets T 1  to T 4  deposited at stages of the pre-sputtering before that. When using the targets T 2  and T 4  for the main sputtering, at the time of pre-sputtering, the holes H 33  and H 34  of the second shutter plate  62  are aligned with the targets T 2  and T 4 , then the first shutter plate  61  on which the deposits T 1   a  to T 4   a  are deposited is rotated so that the holes H 31  and H 32  thereof are aligned with the targets T 2  and T 4 . Due to this, the holes H 31  and H 32  of the first shutter plate  61  and the holes H 33  and H 34  of the second shutter plate  62  are aligned to expose the targets T 2  and T 4  with respect to the substrate and perform the main sputtering. In the above description, only the deposits T 2   a  and T 4   a  pass through locations frontally facing the targets T 2  and T 4  due to the rotation operation of the first shutter plate  61  from the pre-sputtering state to the main sputtering state. For this reason, the cross-contamination explained above can be prevented at the targets T 2  and T 4 . 
       Sixth Embodiment 
       [0157]    Next, a sixth embodiment of the double-layer shutter control method will be explained by referring to  FIG. 22  to  FIG. 24 . This embodiment is an example of five targets and co-sputtering. In  FIG. 22  to  FIG. 24 , the same notations are assigned to the same components as the components explained in the previous embodiments. The five targets are indicated by T 1  to T 5 , the holes of the first shutter plate  61  facing the targets are indicated by H 51 , H 52 , and H 53 , and the holes of the second shutter plate  62  on the substrate side are indicated by H 54  and H 55 . In the first shutter plate  61 , three holes H 51 , H 52 , and H 53  are formed at positions 144° and 72° apart in the clockwise direction, while in the second shutter plate  62 , two holes H 54  and H 55  are formed at positions 144° apart in the clockwise direction. 
         [0158]    As shown in  FIG. 24 , in the case of the present embodiment as well, the main sputtering is sequentially carried out for the five targets T 1  to T 5  in the sequence of the combinations of the targets T 1  and T 3 , the targets T 2  and T 4 , the targets T 1  and T 4 , and the targets T 2  and T 5 .  FIG. 24  shows the positions of rotation movement of the first shutter plate  61  and the second shutter plate  62  in the case of the main sputtering. The step of the pre-sputtering is carried out before the step of the main sputtering for a certain target. 
         [0159]    (A) of  FIG. 24  shows a state of using the two targets T 1  and T 3  for the main sputtering. Deposits T 1   a , T 2   a , T 3   a , T 4   a , and T 5   a  deposited on the surface of the first shutter plate  61  are comprised of the substances of the targets T 1  to T 5  deposited at stages of the pre-sputtering before that. 
         [0160]    As shown in (A) of  FIG. 24 , the rotation operation of the first shutter plate  61  is controlled so that the locations of the deposits T 1   a  to T 5   a  face the targets T 1  to T 5  at the time of the pre-sputtering. When using the targets T 1  and T 3  for the main sputtering, at the time of pre-sputtering, the holes H 54  and H 55  of the second shutter plate  62  are aligned with the targets T 1  and T 3 , then the first shutter plate  61  on which the deposits T 1   a  to T 5   a  are deposited is rotated so that the holes H 51  and H 52  thereof are aligned with the targets T 1  and T 3 . Due to this, the holes H 51  and H 52  of the first shutter plate  61  and the holes H 54  and H 55  of the second shutter plate  62  are aligned to expose the targets T 1  and T 3  with respect to the substrate and perform the main sputtering. In the above description, only the deposits T 1   a  and T 3   a  pass through locations frontally facing the targets T 1  and T 3  due to the rotation operation of the first shutter plate  61  from the pre-sputtering state to the main sputtering state. For this reason, the cross-contamination explained above can be prevented. 
         [0161]    (B) of  FIG. 24  shows a state of next using the targets T 2  and T 4  for the main sputtering. The deposits T 1   a  to T 5   a  deposited on the surface of the first shutter plate  61  are comprised of the substances of the targets T 1  to T 5  deposited at stages of the pre-sputtering before that. When using the targets T 2  and T 4  for the main sputtering, at the time of pre-sputtering, the holes H 54  and H 55  of the second shutter plate  62  are aligned with the targets T 2  and T 4 , then the first shutter plate  61  on which the deposits T 1   a  to T 5   a  are deposited is rotated so that the holes H 51  and H 52  thereof are aligned with the targets T 2  and T 4 . Due to this, the holes H 51  and H 52  of the first shutter plate  61  and the holes H 54  and H 55  of the second shutter plate  62  are aligned to expose the targets T 2  and T 4  with respect to the substrate and perform the main sputtering. In the above description, only the deposits T 2   a  and T 4   a  pass through locations frontally facing the targets T 2  and T 4  due to the rotation operation of the first shutter plate  61  from the pre-sputtering state to the main sputtering state. For this reason, the cross-contamination explained above can be prevented at the targets T 2  and T 4 . 
         [0162]    (C) of  FIG. 24  shows a state of next using the targets T 1  and T 4  for the main sputtering. The deposits T 1   a  to T 5   a  deposited on the surface of the first shutter plate  61  are comprised of the substances of the targets T 1  to T 5  deposited at the stages of the pre-sputtering before that. When using the targets T 1  and T 4  for the main sputtering, at the time of pre-sputtering, the holes H 51  and H 53  of the first shutter plate  61  are aligned with the targets T 1  and T 4 , then the second shutter plate  62  on which the deposits T 1   a , T 3   a , T 4   a , and T 5   a  are deposited is rotated so that the holes H 54  and H 55  thereof are aligned with the targets T 1  and T 4 . Due to this, the holes H 51  and H 53  of the first shutter plate  61  and the holes H 54  and H 55  of the second shutter plate  62  are aligned to expose the targets T 1  and T 4  with respect to the substrate and perform the main sputtering. In the above description, only the deposits T 1   a  and T 4   a  pass through locations frontally facing the targets T 1  and T 4  due to the rotation operation of the first shutter plate  61  from the pre-sputtering state to the main sputtering state. For this reason, the cross-contamination explained above can be prevented at the targets T 1  and T 4 . 
         [0163]    (D) of  FIG. 24  shows a state of next using the targets T 2  and T 5  for the main sputtering. The deposits T 1   a  to T 5   a  deposited on the surface of the first shutter plate  61  are comprised of the substances of the targets T 1  to T 5  deposited at the stages of the pre-sputtering before that. When using the targets T 2  and T 5  for the main sputtering, at the time of pre-sputtering, the holes H 54  and H 55  of the second shutter plate  62  are aligned with the targets T 2  and T 5 , then the first shutter plate  61  on which the deposits T 1   a  to T 5   a  are deposited is rotated so that the holes H 51  and H 53  thereof are aligned with the targets T 2  and T 5 . Due to this, the holes H 51  and H 53  of the first shutter plate  61  and the holes H 54  and H 55  of the second shutter plate  62  are aligned to expose the targets T 2  and T 5  with respect to the substrate and perform the main sputtering. In the above description, only the deposits T 2   a  and T 5   a  pass through locations frontally facing the targets T 2  and T 5  due to the rotation operation of the first shutter plate  61  from the pre-sputtering state to the main sputtering state. For this reason, the cross-contamination explained above can be prevented at the targets T 2  and T 5 . 
         [0164]    (E) of  FIG. 24  shows a state of next using the targets T 3  and T 5  for the main sputtering next. Deposits T 1   a  to T 5   a  deposited on the surface of the first shutter plate  61  are comprised of the substances of the targets T 1  to T 5  deposited at the stages of the pre-sputtering before that. When using the targets T 3  and T 5  for the main sputtering, at the time of pre-sputtering, the holes H 51  and H 53  of the first shutter plate  61  are aligned with the targets T 3  and T 5 , then the second shutter plate  62  on which the deposits T 1   a , T 3   a , T 4   a , and T 5   a  are deposited is rotated so that the holes H 54  and H 55  thereof are aligned with the targets T 3  and T 5 . Due to this, only the deposits T 3   a  and T 3   a  pass through locations frontally facing the targets T 3  and T 5 . For this reason, the cross-contamination explained above can be prevented at the targets T 3  and T 5 . 
         [0165]    In the above double-layer shutter control method, the number of holes formed in each shutter plate for different numbers (n) of targets and the shutters used for the pre-sputtering can be classified as in the table shown in  FIG. 25 . 
         [0166]    The configurations, shapes, sizes, and relative arrangements explained in the above embodiments are only generally shown to an extent enabling the present invention to be understood and worked. The numerical values and compositions (materials) of the configurations are only examples. Accordingly, the present invention is not limited to the explained embodiments. The present invention can be changed in a variety of ways so far as it is not out of the range of the technical ideas shown in the claims. 
         [0167]    The present disclosure relates to subject matter contained in Japanese Patent Application No. 2004-70929, filed on Mar. 12, 2004, the disclosure of which is expressly incorporated herein by reference in its entirety.