Magnetic head and magnetic recording device

Abstract

To provide a magnetic head and a magnetic recording device capable of obtaining stable characteristics.SOLUTION: According to an embodiment, a magnetic head includes a reproducing unit. The reproducing unit includes first to fourth shields, a first magnetic member, first to fourth terminals, and a third shield conductive member. The direction from the first shield toward the second shield is aligned with a first direction, and a second direction from the third shield toward the fourth shield crosses the first direction. The first magnetic member is provided between the first shield and the second shield and between the third shield and the fourth shield. The third shield conductive member is connected to the third shield and includes at least one selected from the group consisting of Cu, Al, Au, and Ag.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] Embodiments of the present invention relate to a magnetic head and a magnetic recording device.

Background Art

[0002] Information is recorded on a magnetic recording medium such as an HDD (Hard Disk Drive) using a magnetic head including a magnetic sensor. Stable characteristics are desired in the magnetic head.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Embodiments of the present invention provide a magnetic head and a magnetic recording device capable of obtaining stable characteristics.

Means for Solving the Problems

[0005] According to an embodiment, the magnetic head includes a reproducing section. The reproducing section includes a first shield, a second shield, a third shield, a fourth shield, a first magnetic member, a first terminal, a second terminal, a third terminal, a fourth terminal, and a third shield conductive member. The direction from the first shield to the second shield is along a first direction. A second direction from the third shield to the fourth shield intersects the first direction. The first magnetic member is provided between the first shield and the second shield and between the third shield and the fourth shield. The first terminal is electrically connected to the first shield. The second terminal is electrically connected to the second shield. The third terminal is electrically connected to the third shield. The fourth terminal is electrically connected to the fourth shield. The third shield conductive member is connected to the third shield and includes at least one selected from the group consisting of Cu, Au, and Ag.

Brief Description of the Drawings

[0006]

Figure 1

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DETAILED DESCRIPTION OF THE INVENTION

[0007] Hereinafter, each embodiment of the present invention will be described with reference to the drawings. The drawings are schematic or conceptual, and the relationship between the thickness and width of each part, the ratio of the sizes between parts, etc. are not necessarily the same as the actual ones. Even when representing the same part, the dimensions and ratios may be represented differently in the drawings. In the present specification and each figure, the same elements as those described above with respect to the previously shown figures are denoted by the same reference numerals, and detailed descriptions thereof are omitted as appropriate.

[0008] (First Embodiment) FIGS. 1(a) to 1(c) are schematic cross-sectional views illustrating a magnetic head according to the first embodiment. FIG. 1(b) is a cross-sectional view taken along the line Y1 - Y2 of FIG. 1(a). FIG. 1(c) is a cross-sectional view taken along the line X1 - X2 of FIG. 1(a). As shown in these figures, the magnetic head 110 according to the embodiment includes a reproducing section 70.

[0009] The reproducing section 70 includes a first shield 41, a second shield 42, a third shield 43, a fourth shield 44, a first terminal 41T, a second terminal 42T, a third terminal 43T, a fourth terminal 44T, and a third shield conductive member 43C. In this example, the reproducing section 70 further includes a fourth shield conductive member 44C.

[0010] The direction from the first shield 41 to the second shield 42 is along a first direction D1. The first direction D1 is the X-axis direction. One direction perpendicular to the X-axis direction is the Y-axis direction. The direction perpendicular to the X-axis direction and the Y-axis direction is the Z-axis direction. The X-axis direction is, for example, the down-track direction. The Y-axis direction is, for example, the cross-track direction. The Z-axis direction is, for example, the height direction.

[0011] A second direction D2 from the third shield 43 to the fourth shield 44 intersects the first direction D1. The second direction D2 may be, for example, the Y-axis direction.

[0012] In this example, the third shield 43 and the fourth shield 44 are provided between the first shield 41 and the second shield 42 in the first direction D1. The third shield 43 and the fourth shield 44 are, for example, side shields.

[0013] The first magnetic member 11 is provided between the first shield 41 and the second shield 42 in the first direction D1 and between the third shield 43 and the fourth shield 44 in the second direction D2. The position of the first magnetic member 11 in the first direction D1 is between the position of the first shield 41 in the first direction D1 and the position of the second shield 42 in the first direction D1. The position of the first magnetic member 11 in the second direction D2 is between the position of the third shield 43 in the second direction D2 and the position of the fourth shield 44 in the second direction D2.

[0014] The first terminal 41T is electrically connected to the first shield 41. The second terminal 42T is electrically connected to the second shield 42. The third terminal 43T is electrically connected to the third shield 43. The fourth terminal 44T is electrically connected to the fourth shield 44.

[0015] The third shield conductive member 43C is connected to the third shield 43. The third shield conductive member 43C includes at least one selected from the group consisting of Cu, Al, Au, and Ag. The third shield conductive member 43C is non-magnetic.

[0016] The fourth shield conductive member 44C is connected to the fourth shield 44. The fourth shield conductive member 44C includes at least one selected from the group consisting of Cu, Al, Au, and Ag. The fourth shield conductive member 44C is non-magnetic.

[0017] At least one of the third shield conductive member 43C and the fourth shield conductive member 44C functions as a heat sink. As will be described later, a current is supplied to the first magnetic member 11. The temperature of the first magnetic member 11 rises due to the current. The heat of the first magnetic member 11 is efficiently dissipated by the third shield conductive member 43C and the fourth shield conductive member 44C. For example, deterioration of the characteristics of the first magnetic member 11 due to heat can be suppressed. For example, the temperature distribution around the first magnetic member 11 can be made uniform. According to the embodiment, a magnetic head capable of obtaining stable characteristics can be provided.

[0018] The first shield 41, the second shield 42, the third shield 43, and the fourth shield 44 include a magnetic material. These shields include, for example, at least one selected from the group consisting of Fe, Ni, and Co. These shields include, for example, a soft magnetic material. In these shields, the thermal conductivity is low.

[0019] For example, the thermal conductivity of the third shield conductive member 43C is higher than the thermal conductivity of the third shield 43. The thermal conductivity of the fourth shield conductive member 44C is higher than the thermal conductivity of the fourth shield 44. Effective heat dissipation can be obtained.

[0020] As shown in FIG. 1(a), the first circuit 51 and the second circuit 52 may be electrically connected to the reproducing unit 70. The first circuit 51 is configured to supply a current between the third terminal 43T and the fourth terminal 44T. The second circuit 52 is configured to detect the voltage between the first terminal 41T and the second terminal 42T. The voltage changes according to the magnetization state recorded on the magnetic recording medium by the reproducing unit 70 (magnetic head 110).

[0021] This voltage change may be based on, for example, the anomalous Hall effect (AHE). For example, the first magnetic member 11 may have the anomalous Hall effect. For example, the first magnetic member 11 may include at least one selected from the group consisting of CoMnGa, CoMnAl, and FePt. In such materials, a large anomalous Hall effect is easily obtained. For example, a large detection output is easily obtained. CoMnGa and CoMnAl are, for example, Heusler alloy materials.

[0022] In an embodiment, the volume of the third shield conductive member 43C may be larger than the volume of the third shield 43. For example, the volume of the fourth shield conductive member 44C may be larger than the volume of the fourth shield 44. More efficient heat dissipation can be obtained.

[0023] In this example, at least a part of the third shield 43 is provided between the third shield conductive member 43C and the first magnetic member 11 in the second direction D2. At least a part of the fourth shield 44 is provided between the first magnetic member 11 and the fourth shield conductive member 44C in the second direction D2. As will be described later, the arrangement of the shields and the shield conductive members can be variously deformed.

[0024] As shown in Fig. 1(a), in this example, the reproducing unit 70 includes a first conductive layer 31, a second conductive layer 32, a third conductive layer 33, and a fourth conductive layer 34. The first conductive layer 31 is provided between the first shield 41 and the first magnetic member 11. The second conductive layer 32 is provided between the second shield 42 and the first magnetic member 11. The third conductive layer 33 is provided between the third shield 43 and the first magnetic member 11. The fourth conductive layer 34 is provided between the fourth shield 44 and the first magnetic member 11. At least any one of the first conductive layer 31, the second conductive layer 32, the third conductive layer 33, and the fourth conductive layer 34 includes at least one selected from the group consisting of Ta, Ti, W, Cu, Al, and Ru. Due to an appropriate electrical resistance, the shield and the first magnetic member 11 are electrically connected. Due to an appropriate electrical resistance, the terminal and the first magnetic member 11 are connected.

[0025] As shown in Fig. 1(a), the reproducing unit 70 may further include an insulating member 30i. A part of the insulating member 30i is provided between the first shield 41 and the third shield 43. A part of the insulating member 30i is provided between the first shield 41 and the fourth shield 44. A part of the insulating member 30i is provided between the second shield 42 and the third shield 43. A part of the insulating member 30i is provided between the second shield 42 and the fourth shield 44. The insulating member 30i includes at least one selected from the group consisting of Si and Al, and at least one selected from the group consisting of oxygen and nitrogen.

[0026] In an embodiment, the length of the first magnetic member 11 along the first direction D1 may be, for example, 3 nm or more and 25 nm or less. The length of the first magnetic member 11 along the second direction D2 may be, for example, 3 nm or more and 25 nm or less. The length of the first magnetic member 11 along the third direction D3 may be, for example, 3 nm or more and 25 nm or less. The third direction D3 intersects the plane including the first direction D1 and the second direction D2. The third direction D3 may be, for example, the Z-axis direction.

[0027] In one example, the current density applied to the first magnetic member 11 is 5×10 8 A / m 2In this case, by providing the third shield conductive member 43C and the fourth shield conductive member 44C, the temperature of the first magnetic member 11 can be lowered by 50 degrees or more compared to the reference example in which these shield conductive members are not provided.

[0028] FIG. 2 is a schematic cross-sectional view illustrating a magnetic head according to the first embodiment. As shown in FIG. 2, in the magnetic head 111 according to the embodiment, the shape of the reproducing portion 70 is different from the shape of the reproducing portion 70 in the magnetic head 110. The configuration of the magnetic head 111 except for this may be the same as the configuration of the magnetic head 110.

[0029] In the magnetic head 111, the length along the third direction D3 of the third shield 43 is longer than the length along the third direction D3 of the first magnetic member 11. The length along the third direction D3 of the fourth shield 44 is longer than the length along the third direction D3 of the first magnetic member 11. The length along the third direction D3 of the third shield conductive member 43C is longer than the length along the third direction D3 of the first magnetic member 11. The length along the third direction D3 of the fourth shield conductive member 44C is longer than the length along the third direction D3 of the first magnetic member 11. More efficient heat dissipation can be obtained.

[0030] FIG. 3 is a schematic cross-sectional view illustrating a magnetic head according to the first embodiment. As shown in FIG. 3, in the magnetic head 112 according to the embodiment, the shape of the reproducing portion 70 is different from the shape of the reproducing portion 70 in the magnetic head 110. The configuration of the magnetic head 112 except for this may be the same as the configuration of the magnetic head 110.

[0031] In the magnetic head 112, the third shield 43 includes a third facing surface 43a and a third opposite surface 43b. The third facing surface 43a faces the first magnetic member 11. The third opposite surface 43b faces the third shield conductive member 43C. The length of the third opposite surface 43b along the third direction D3 is longer than the length of the third facing surface 43a along the third direction D3. More efficient heat dissipation can be obtained. The length of the third facing surface 43a along the third direction D3 may be the same as, longer than, or shorter than the length of the first magnetic member 11 along the third direction D3.

[0032] The fourth shield 44 includes a fourth facing surface 44a and a fourth opposite surface 44b. The fourth facing surface 44a faces the first magnetic member 11. The fourth opposite surface 44b faces the fourth shield conductive member 44C. The length of the fourth opposite surface 44b along the third direction D3 is longer than the length of the fourth facing surface 44a along the third direction D3. More efficient heat dissipation can be obtained. The length of the fourth facing surface 44a along the third direction D3 may be the same as, longer than, or shorter than the length of the first magnetic member 11 along the third direction D3.

[0033] FIG. 4 is a schematic cross-sectional view illustrating the magnetic head according to the first embodiment. As shown in FIG. 4, in the magnetic head 113 according to the embodiment, the shape of the reproducing section 70 is different from the shape of the reproducing section 70 in the magnetic head 110. The configuration of the magnetic head 113 except this may be the same as the configuration of the magnetic head 110.

[0034] In the magnetic head 113, the third direction D3 from the third shield 43 to the third shield conductive member 43C intersects the plane including the first direction D1 and the second direction D2. The third direction D3 from the fourth shield 44 to the fourth shield conductive member 44C intersects the plane including the first direction D1 and the second direction D2.

[0035] FIGS. 5(a) to 5(d) are schematic cross-sectional views illustrating the magnetic head according to the first embodiment. The magnetic head 120 according to the embodiment also includes a reproducing section 70. The reproducing section 70 includes a first shield 41, a second shield 42, a third shield 43, a fourth shield 44, a first terminal 41T, a second terminal 42T, a third terminal 43T, a fourth terminal 44T, and a first shield conductive member 41C. Except for the first shield conductive member 41C, the configuration of the magnetic head 120 may be the same as that of the magnetic head 110.

[0036] FIG. 5(a) is a cross-sectional view in a plane including the second shield 42. FIG. 5(b) is a cross-sectional view in a plane including the first magnetic member 11. FIG. 5(c) is a cross-sectional view in a plane including the first shield 41. FIG. 5(d) is a cross-sectional view corresponding to the X1-X2 line in FIG. 1(a).

[0037] The first shield conductive member 41C is connected to the first shield 41. The third direction D3 from at least a part of the first shield 41 to the first shield conductive member 41C intersects the plane including the first direction D1 and the second direction D2. The first shield conductive member 41C includes at least one selected from the group consisting of Cu, Al, Au, and Ag.

[0038] The first shield conductive member 41C functions as, for example, a heat sink. Efficient heat dissipation can be obtained. A magnetic head capable of obtaining stable characteristics can be provided.

[0039] In the embodiment, the first shield 41 and the second shield 42 can be interchanged with each other. The first shield conductive member 41C described with respect to the magnetic head 120 may be connected to the second shield 42.

[0040] FIG. 6 is a schematic cross-sectional view illustrating the magnetic head according to the first embodiment. As shown in FIG. 6, in the magnetic head 121 according to the embodiment, the reproducing section 70 further includes a second shield conductive member 42C. Except for this, the configuration of the magnetic head 121 may be the same as that of the magnetic head 120. FIG. 6 is a cross-sectional view corresponding to the X1-X2 line in FIG. 1(a).

[0041] The second shield conductive member 42C is connected to the second shield 42. The direction from at least a part of the second shield 42 to the second shield conductive member 42C is along the third direction D3. The second shield conductive member 42C includes at least one selected from the group consisting of Cu, Al, Au, and Ag. The second shield conductive member 42C functions as, for example, a heat sink. Efficient heat dissipation is obtained.

[0042] FIGS. 7(a) and 7(b) are schematic cross-sectional views illustrating the magnetic head according to the first embodiment. The magnetic head 130 according to the embodiment also includes a reproducing section 70. The reproducing section 70 includes a first shield 41, a second shield 42, a third shield 43, a fourth shield 44, a first terminal 41T, a second terminal 42T, a third terminal 43T, a fourth terminal 44T, a first conductive member 40C, and a first insulating layer 40i. Except for the first conductive member 40C and the first insulating layer 40i, the configuration of the magnetic head 130 may be the same as the configuration of the magnetic head 110.

[0043] The first conductive member 40C includes at least one selected from the group consisting of Cu, Al, Au, and Ag. At least a part of the first insulating layer 40i is provided between the first conductive member 40C and the first magnetic member 11. The heat of the first magnetic member 11 is transmitted to the first conductive member 40C through the first insulating layer 40i. The first conductive member 40C functions as, for example, a heat sink. Efficient heat dissipation is obtained.

[0044] In this example, the third direction D3 from the first magnetic member 11 to the first conductive member 40C intersects the plane including the first direction D1 and the second direction D2. The thickness of the first insulating layer 40i along the third direction D3 may be, for example, 1 nm or more and 20 nm or less. Good insulation and good heat conduction are easily obtained.

[0045] The first insulating layer 40i includes, for example, at least one selected from the group consisting of Si and Al, and at least one selected from the group consisting of oxygen and nitrogen.

[0046] FIG. 8 is a schematic cross-sectional view illustrating the magnetic head according to the first embodiment. In the magnetic head 131 according to the embodiment, the shape of the reproducing section 70 is different from the shape of the reproducing section 70 in the magnetic head 130. The configuration of the magnetic head 131 other than this may be the same as the configuration of the magnetic head 130.

[0047] In the magnetic head 131, at least a part of the first conductive member 40C is provided between the third shield 43 and the fourth shield 44 in the second direction D2. A part of the first insulating layer 40i is provided between the first conductive member 40C and the third shield 43 and between the first conductive member 40C and the fourth shield 44. Efficient heat dissipation can be obtained.

[0048] FIG. 9 is a schematic cross-sectional view illustrating the magnetic head according to the first embodiment. In the magnetic head 132 according to the embodiment, the shape of the reproducing section 70 is different from the shape of the reproducing section 70 in the magnetic head 131. The configuration of the magnetic head 132 other than this may be the same as the configuration of the magnetic head 131.

[0049] In the magnetic head 132, the surface of the first conductive member 40C facing the third shield 43 is inclined with respect to the third direction D3. The surface of the first conductive member 40C facing the fourth shield 44 is inclined with respect to the third direction D3. Also in the magnetic head 132, efficient heat dissipation can be obtained.

[0050] FIG. 10 is a schematic cross-sectional view illustrating the magnetic head according to the first embodiment. In the magnetic head 133 according to the embodiment, the reproducing section 70 includes a third shield conductive member 43C and a fourth shield conductive member 44C. The configuration of the magnetic head 133 other than this may be the same as the configuration of the magnetic head 131.

[0051] The third shield conductive member 43C is connected to the third shield 43. The fourth shield conductive member 44C is connected to the fourth shield 44. The third shield conductive member 43C and the fourth shield conductive member 44C include at least one selected from the group consisting of Cu, Al, Au, and Ag. By providing the third shield conductive member 43C and the fourth shield conductive member 44C in addition to the first conductive member 40C, higher heat dissipation can be obtained.

[0052] In this example, at least a part of the third shield 43 is provided between the third shield conductive member 43C and the first magnetic member 11 in the second direction D2. At least a part of the fourth shield 44 is provided between the first magnetic member 11 and the fourth shield conductive member 44C in the second direction D2.

[0053] FIG. 11 is a schematic cross-sectional view illustrating a magnetic head according to the first embodiment. In the magnetic head 134 according to the embodiment, the shape of the reproducing section 70 is different from the shape of the reproducing section 70 in the magnetic head 133. The configuration of the magnetic head 133 except for this may be the same as the configuration of the magnetic head 131.

[0054] In the magnetic head 134, the third shield 43 includes a third facing surface 43a and a third facing other surface 43b. The third facing surface 43a faces the first magnetic member 11. The third facing other surface 43b faces the third shield conductive member 43C. The length of the third facing other surface 43b along the third direction D3 is longer than the length of the third facing surface 43a along the third direction D3. More efficient heat dissipation can be obtained.

[0055] In the magnetic head 134, the fourth shield 44 includes a fourth facing surface 44a and a fourth facing other surface 44b. The fourth facing surface 44a faces the first magnetic member 11. The fourth facing other surface 44b faces the fourth shield conductive member 44C. The length of the fourth facing other surface 44b along the third direction D3 is longer than the length of the fourth facing surface 44a along the third direction D3. More efficient heat dissipation can be obtained.

[0056] FIG. 12 is a schematic perspective view illustrating a magnetic head and a magnetic recording apparatus according to the first embodiment. As shown in FIG. 12, a magnetic head 110 is depicted as the magnetic head according to the first embodiment. The magnetic recording apparatus 150 according to the embodiment includes the magnetic head 110 and the magnetic recording medium 80.

[0057] As shown in FIG. 12, the magnetic head 110 according to the embodiment may further include a recording unit 90. Information is recorded on the magnetic recording medium 80 by the recording unit 90 of the magnetic head 110. Information recorded on the magnetic recording medium 80 is reproduced by the reproducing unit 70.

[0058] The magnetic recording medium 80 includes, for example, a medium substrate 82 and a magnetic recording layer 81 provided on the medium substrate 82. The magnetization 83 of the magnetic recording layer 81 is controlled by the recording unit 90. The recording unit 90 includes, for example, a first magnetic pole 91 and a second magnetic pole 92. The first magnetic pole 91 is, for example, a main magnetic pole. The second magnetic pole 92 is, for example, a trailing shield. The recording unit 90 may include a recording element 93. The recording element 93 may include a magnetic field control element, a heating element, or a high-frequency oscillation element, etc. The recording element 93 may be omitted.

[0059] The reproducing unit 70 includes, for example, a first shield 41, a second shield 42, and a first magnetic member 11. The first magnetic member 11 can output a signal corresponding to the magnetization 83 of the magnetic recording layer 81. In FIG. 12, the third shield 43 and the fourth shield 44 are omitted. In FIG. 12, the above-described shield conductive members are omitted.

[0060] As shown in FIG. 12, the magnetic recording medium 80 moves relative to the magnetic head 110 in the direction of the medium moving direction 85. By the magnetic head 110, information corresponding to the magnetization 83 of the magnetic recording layer 81 is controlled at an arbitrary position. By the magnetic head 110, information corresponding to the magnetization 83 of the magnetic recording layer 81 is reproduced at an arbitrary position.

[0061] FIG. 13 is a schematic plan view illustrating a magnetic head and a magnetic recording apparatus according to the first embodiment. The magnetic head 110 may further include a recording section 90 including a first pole 91. The recording section 90 includes the first pole 91. For example, the third shield 43 overlaps a part of the first pole 91 in the first direction D1. At least a part of the third shield conductive member 43C does not overlap the first pole 91 in the first direction D1. For example, the fourth shield 44 overlaps another part of the first pole 91 in the first direction D1. At least a part of the fourth shield conductive member 44C does not overlap the first pole 91 in the first direction D1. The first magnetic member 11 may overlap the recording element 93 in the first direction D1.

[0062] (Second Embodiment) The second embodiment relates to a magnetic recording apparatus 150. The magnetic recording apparatus 150 includes a magnetic head (for example, the magnetic head 110) according to the first embodiment and a magnetic recording medium 80 (see FIG. 12). The magnetic recording apparatus 150 includes the first circuit 51 and the second circuit 52 described with reference to FIG. 1(a). The magnetic recording medium 80 faces the magnetic head 110. The first circuit 51 is configured to supply a current between the third terminal 43T and the fourth terminal 44T. The second circuit 52 is configured to detect a voltage between the first terminal 41T and the second terminal 42T. The voltage changes according to the magnetization state recorded on the magnetic recording medium 80.

[0063] FIG. 14 is a schematic perspective view illustrating a part of a magnetic recording apparatus according to an embodiment. FIG. 14 illustrates a head slider. The magnetic head 110 is provided on a head slider 159. The head slider 159 includes, for example, Al 2 O 3 / TiC or the like. The head slider 159 moves relative to the magnetic recording medium while floating or contacting on the magnetic recording medium.

[0064] The head slider 159 has, for example, an air inflow side 159A and an air outflow side 159B. The magnetic head 110 is disposed, for example, on the side surface of the air outflow side 159B of the head slider 159. Thereby, the magnetic head 110 moves relative to the magnetic recording medium while floating or contacting on the magnetic recording medium.

[0065] FIG. 15 is a schematic perspective view illustrating a magnetic recording apparatus according to an embodiment. FIGS. 16(a) and 16(b) are schematic perspective views illustrating a part of the magnetic recording apparatus according to the embodiment. The magnetic recording apparatus may be a magnetic recording and reproducing apparatus. As shown in FIG. 15, in the magnetic recording apparatus 150 according to the embodiment, a rotary actuator is used. The recording medium disk 180 is mounted on the spindle motor 180M. The recording medium disk 180 rotates in the direction of arrow AR by the spindle motor 180M. The spindle motor 180M responds to a control signal from the drive device control unit. The magnetic recording apparatus 150 according to the present embodiment may include a plurality of recording medium disks 180. The magnetic recording apparatus 150 may include a recording medium 181. The recording medium 181 is, for example, an SSD (Solid State Drive). A non-volatile memory such as a flash memory is used for the recording medium 181. For example, the magnetic recording apparatus 150 may be a hybrid HDD (Hard Disk Drive).

[0066] The head slider 159 records and reproduces information to be recorded on the recording medium disk 180. The head slider 159 is provided at the tip of the thin film suspension 154. A magnetic head according to the embodiment is provided near the tip of the head slider 159.

[0067] When the recording medium disk 180 rotates, the pressing pressure by the suspension 154 and the pressure generated on the medium-facing surface (ABS) of the head slider 159 are balanced. The distance between the medium-facing surface of the head slider 159 and the surface of the recording medium disk 180 becomes a predetermined floating amount. In an embodiment, the head slider 159 may be in contact with the recording medium disk 180. For example, a contact running type may be applied.

[0068] The suspension 154 is connected to one end of an arm 155 (for example, an actuator arm). The arm 155 has, for example, a bobbin portion or the like. The bobbin portion holds a drive coil. A voice coil motor 156 is provided at the other end of the arm 155. The voice coil motor 156 is a kind of linear motor. The voice coil motor 156 includes, for example, a drive coil and a magnetic circuit. The drive coil is wound around the bobbin portion of the arm 155. The magnetic circuit includes a permanent magnet and an opposing yoke. The drive coil is provided between the permanent magnet and the opposing yoke. The suspension 154 has one end and the other end. The magnetic head is provided at one end of the suspension 154. The arm 155 is connected to the other end of the suspension 154.

[0069] The arm 155 is held by ball bearings. The ball bearings are provided at two locations above and below the bearing portion 157. The arm 155 can be rotated and slid by the voice coil motor 156. The magnetic head can be moved to any position on the recording medium disk 180.

[0070] FIG. 16(a) illustrates a partial configuration of a magnetic recording device and is an enlarged perspective view of a head stack assembly 160. FIG. 16(b) is a perspective view illustrating a magnetic head assembly (head gimbal assembly: HGA) 158 that is part of the head stack assembly 160.

[0071] As shown in FIG. 16(a), the head stack assembly 160 includes a bearing portion 157, a head gimbal assembly 158, and a support frame 161. The head gimbal assembly 158 extends from the bearing portion 157. The support frame 161 extends from the bearing portion 157. The extending direction of the support frame 161 is opposite to the extending direction of the head gimbal assembly 158. The support frame 161 supports the coil 162 of the voice coil motor 156.

[0072] As shown in FIG. 16(b), the head gimbal assembly 158 has an arm 155 extending from the bearing portion 157 and a suspension 154 extending from the arm 155.

[0073] A head slider 159 is provided at the tip of the suspension 154. A magnetic head according to the embodiment is provided on the head slider 159.

[0074] The magnetic head assembly (head gimbal assembly) 158 according to the embodiment includes the magnetic head according to the embodiment, a head slider 159 provided with the magnetic head, a suspension 154, and an arm 155. The head slider 159 is provided at one end of the suspension 154. The arm 155 is connected to the other end of the suspension 154.

[0075] The suspension 154 has, for example, a lead wire (not shown) for signal recording and reproduction. The suspension 154 may have, for example, a lead wire (not shown) for a heater for floating height adjustment. The suspension 154 may have a lead wire (not shown) for an oscillation element or the like. These lead wires are electrically connected to a plurality of electrodes provided on the magnetic head.

[0076] In the magnetic recording device 150, a signal processing unit 190 is provided. The signal processing unit 190 records and reproduces signals on a magnetic recording medium using a magnetic head. The input / output lines of the signal processing unit 190 are connected to, for example, the electrode pads of the head gimbal assembly 158 and are electrically connected to the magnetic head.

[0077] The magnetic recording device 150 according to the embodiment includes a magnetic recording medium, a magnetic head according to the embodiment, a movable part, a position control part, and a signal processing part. The movable part enables relative movement in a state where the magnetic recording medium and the magnetic head are separated or in contact with each other. The position control part aligns the magnetic head with a predetermined recording position on the magnetic recording medium. The signal processing part records and reproduces signals on the magnetic recording medium using the magnetic head.

[0078] For example, as the magnetic recording medium described above, a recording medium disk 180 is used. The movable part described above includes, for example, a head slider 159. The position control part described above includes, for example, a head gimbal assembly 158.

[0079] The embodiment may include the following technical solutions. (Technical solution 1) Equipped with a reproduction part, The reproduction part is a first shield, a second shield, wherein the direction from the first shield to the second shield follows a first direction, the second shield, a third shield, a fourth shield, wherein the second direction from the third shield to the fourth shield intersects the first direction, the fourth shield, a first magnetic member provided between the first shield and the second shield and between the third shield and the fourth shield, a first terminal electrically connected to the first shield, a second terminal electrically connected to the second shield, a third terminal electrically connected to the third shield, A fourth terminal electrically connected to the fourth shield, A third shield conductive member connected to the third shield and including at least one selected from the group consisting of Cu, Al, Au, and Ag, A magnetic head including the above.

[0080] (Technical solution 2) The magnetic head according to Technical solution 1, wherein the volume of the third shield conductive member is larger than the volume of the third shield.

[0081] (Technical solution 3) The reproducing unit further includes a fourth shield conductive member, The magnetic head according to Technical solution 1 or 2, wherein the fourth shield conductive member is connected to the fourth shield and includes at least one selected from the group consisting of Cu, Al, Au, and Ag.

[0082] (Technical solution 4) The magnetic head according to Technical solution 3, wherein the volume of the fourth shield conductive member is larger than the volume of the fourth shield.

[0083] (Technical solution 5) The magnetic head according to Technical solution 3 or 4, wherein at least a part of the fourth shield is provided between the first magnetic member and the fourth shield conductive member in the second direction.

[0084] (Technical solution 6) The fourth shield includes a fourth opposing surface and a fourth opposing other surface, The fourth opposing surface faces the first magnetic member, The fourth opposing other surface faces the fourth shield conductive member, The length of the fourth opposing other surface along the third direction is longer than the length of the fourth opposing surface along the third direction, The magnetic head according to any one of Technical solutions 3 to 5, wherein the third direction intersects a plane including the first direction and the second direction.

[0085] (Technical solution 7) The third shield includes a third facing surface and a third opposite surface, The third facing surface faces the first magnetic member, The third opposite surface faces the third shield conductive member, The length of the third opposite surface along the third direction is longer than the length of the third facing surface along the third direction, The third direction intersects with the plane including the first direction and the second direction. The magnetic head according to any one of Technical Solutions 1 to 5.

[0086] (Technical Solution 8) At least a part of the third shield is provided between the third shield conductive member and the first magnetic member in the second direction. The magnetic head according to any one of Technical Solutions 1 to 5.

[0087] (Technical Solution 9) The third direction from the third shield to the third shield conductive member intersects with the plane including the first direction and the second direction. The magnetic head according to any one of Technical Solutions 1 to 5.

[0088] (Technical Solution 10) The third direction from the fourth shield to the fourth shield conductive member intersects with the plane including the first direction and the second direction. The magnetic head according to any one of Technical Solutions 3 to 5.

[0089] (Technical Solution 11) The third shield and the fourth shield are provided between the first shield and the second shield. The magnetic head according to any one of Technical Solutions 1 to 10.

[0090] (Technical Solution 12) It includes a reproducing section, The reproducing section is, The first shield, The second shield, wherein the direction from the first shield to the second shield is along the first direction. The second shield, The third shield, A fourth shield, the fourth shield in which the second direction from the third shield to the fourth shield intersects the first direction, and a first magnetic member provided between the first shield and the second shield and between the third shield and the fourth shield, a first terminal electrically connected to the first shield, a second terminal electrically connected to the second shield, a third terminal electrically connected to the third shield, a fourth terminal electrically connected to the fourth shield, a first shield conductive member connected to the first shield, wherein a third direction from at least a part of the first shield to the first shield conductive member intersects a plane including the first direction and the second direction, and the first shield conductive member includes at least one selected from the group consisting of Cu, Al, Au, and Ag, the first shield conductive member; A magnetic head including.

[0091] (Technical Proposal 13) The reproducing unit further includes a second shield conductive member, The second shield conductive member is connected to the second shield, A direction from at least a part of the second shield to the second shield conductive member is along the third direction, The second shield conductive member includes at least one selected from the group consisting of Cu, Al, Au, and Ag, the magnetic head according to Technical Proposal 12.

[0092] (Technical Proposal 14) Comprising a reproducing unit, The reproducing unit is a first shield, a second shield, wherein a direction from the first shield to the second shield is along a first direction, the second shield, a third shield, a fourth shield, wherein a second direction from the third shield to the fourth shield intersects the first direction, the fourth shield, A first magnetic member provided between the first shield and the second shield and between the third shield and the fourth shield; A first terminal electrically connected to the first shield; A second terminal electrically connected to the second shield; A third terminal electrically connected to the third shield; A fourth terminal electrically connected to the fourth shield; A first conductive member including at least one selected from the group consisting of Cu, Al, Au, and Ag; A first insulating layer, at least a part of which is provided between the first conductive member and the first magnetic member; A magnetic head including the above.

[0093] (Technical solution 15) The magnetic head according to Technical solution 14, wherein a third direction from the first magnetic member to the first conductive member intersects a plane including the first direction and the second direction.

[0094] (Technical solution 16) At least a part of the first conductive member is provided between the third shield and the fourth shield in the second direction, The magnetic head according to Technical solution 14 or 15, wherein a part of the first insulating layer is provided between the first conductive member and the third shield and between the first conductive member and the fourth shield.

[0095] (Technical solution 17) The reproducing unit further includes a third shield conductive member and a fourth shield conductive member, The third shield conductive member is connected to the third shield, The fourth shield conductive member is connected to the fourth shield, The magnetic head according to any one of Technical solutions 14 to 16, wherein the third shield conductive member and the fourth shield conductive member include at least one selected from the group consisting of Cu, Al, Au, and Ag.

[0096] (Technical Solution 18) At least a part of the third shield is provided between the third shield conductive member and the first magnetic member in the second direction, The magnetic head according to Technical Solution 17, wherein at least a part of the fourth shield is provided between the first magnetic member and the fourth shield conductive member in the second direction.

[0097] (Technical Solution 19) Further comprising a recording portion including a first magnetic pole, The third shield overlaps a part of the first magnetic pole in the first direction, The magnetic head according to any one of Technical Solutions 1 to 11, wherein at least a part of the third shield conductive member does not overlap the first magnetic pole in the first direction.

[0098] (Technical Solution 20) The magnetic head according to any one of Technical Solutions 1 to 19, A magnetic recording medium facing the magnetic head, A first circuit, A second circuit, Comprising: The first circuit is configured to supply a current between the third terminal and the fourth terminal, The second circuit is configured to detect a voltage between the first terminal and the second terminal, The magnetic recording device, wherein the voltage is configured to change according to a magnetization state recorded on the magnetic recording medium.

[0099] According to the embodiment, a magnetic head and a magnetic recording device capable of obtaining stable characteristics can be provided.

[0100] In this specification, "vertical" and "parallel" include not only strict vertical and strict parallel, but also, for example, variations in the manufacturing process, and it is sufficient that they are substantially vertical and substantially parallel.

[0101] The embodiments of the present invention have been described above with reference to specific examples. However, the present invention is not limited to these specific examples. For example, regarding the specific configurations of each element such as a shield, a magnetic member, a conductive member, an insulating layer, an insulating member, and a terminal included in a magnetic head and a magnetic recording device, those skilled in the art can appropriately select from the known range to similarly implement the present invention and obtain similar effects as long as they are included in the scope of the present invention.

[0102] Combinations of any two or more elements of each specific example within a technically possible range are also included in the scope of the present invention as long as they include the gist of the present invention.

[0103] In addition, based on the magnetic head and the magnetic recording device described above as embodiments of the present invention, all magnetic heads and magnetic recording devices that can be appropriately designed and modified by those skilled in the art also belong to the scope of the present invention as long as they include the gist of the present invention.

[0104] In addition, within the scope of the idea of the present invention, those skilled in the art can conceive of various modification examples and correction examples, and it is understood that these modification examples and correction examples also belong to the scope of the present invention.

[0105] Some embodiments of the present invention have been described, but these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and its equivalent scope.

Explanation of Reference Numerals

[0106] 11: First magnetic member, 30i: Insulating member, 31 - 34: First to fourth conductive layers, 40C: First conductive member, 40i: First insulating layer, 41 - 44: First to fourth shields, 41C - 44C: First to fourth shield conductive members, 41T - 44T: First to fourth terminals, 43a: Third opposing surface, 43b: Third opposing other surface, 44a: Fourth opposing surface, 44b: Fourth opposing other surface, 51, 52: First, second circuits, 70: Reproduction unit, 80: Magnetic recording medium, 81: Magnetic recording layer, 82: Medium substrate, 83: Magnetization, 85: Medium moving direction, 90: Recording unit, 91, 92: First, second magnetic poles, 93: Recording unit element, 110 - 113, 120 - 121, 130 - 134: Magnetic heads, 150: Magnetic recording device, 154: Suspension, 155: Arm, 156: Voice coil motor, 157: Bearing portion, 158: Head gimbal assembly, 159: Head slider, 159A: Air inflow side, 159B: Air outflow side, 160: Head stack assembly, 161: Support frame, 162: Coil, 180: Recording medium disk, 180M: Spindle motor, 181: Recording medium, 190: Signal processing unit, AR: Arrow, D1 - D3: First to third directions

Claims

1. comprising a reproducing section, wherein the reproducing section includes a first shield, a second shield, wherein the direction from the first shield to the second shield is along a first direction, a third shield, a fourth shield, wherein a second direction from the third shield to the fourth shield intersects the first direction, a first magnetic member provided between the first shield and the second shield and between the third shield and the fourth shield, a first terminal electrically connected to the first shield, a second terminal electrically connected to the second shield, a third terminal electrically connected to the third shield, a fourth terminal electrically connected to the fourth shield, a third shield conductive member connected to the third shield and including at least one selected from the group consisting of Cu, Al, Au, and Ag, a magnetic head.

2. wherein the reproducing section further includes a fourth shield conductive member, wherein the fourth shield conductive member is connected to the fourth shield and includes at least one selected from the group consisting of Cu, Al, Au, and Ag, the magnetic head according to claim 1.

3. wherein the third shield includes a third facing surface and a third opposite surface, wherein the third facing surface faces the first magnetic member, wherein the third opposite surface faces the third shield conductive member, wherein a length of the third opposite surface along a third direction is longer than a length of the third facing surface along the third direction, wherein the third direction intersects a plane including the first direction and the second direction, the magnetic head according to claim 1 or 2.

4. wherein at least a part of the third shield is provided between the third shield conductive member and the first magnetic member in the second direction, the magnetic head according to claim 1 or 2.

5. wherein a third direction from the third shield to the third shield conductive member intersects a plane including the first direction and the second direction, the magnetic head according to claim 1 or 2.

6. comprising a reproducing section, wherein the reproducing section includes a first shield, a second shield, wherein the direction from the first shield to the second shield is along a first direction, a third shield, a fourth shield, wherein a second direction from the third shield to the fourth shield intersects the first direction, A first magnetic member provided between the first shield and the second shield and between the third shield and the fourth shield; A first terminal electrically connected to the first shield; A second terminal electrically connected to the second shield; A third terminal electrically connected to the third shield; A fourth terminal electrically connected to the fourth shield; A first shield conductive member connected to the first shield, wherein a third direction from at least a part of the first shield to the first shield conductive member intersects a plane including the first direction and the second direction, and the first shield conductive member includes at least one selected from the group consisting of Cu, Al, Au, and Ag; the first shield conductive member; A magnetic head including the above. **Claim 7** Comprising a reproducing section, The reproducing section is, A first shield, A second shield, wherein a direction from the first shield to the second shield is along a first direction; the second shield, A third shield, A fourth shield, wherein a second direction from the third shield to the fourth shield intersects the first direction; the fourth shield, A first magnetic member provided between the first shield and the second shield and between the third shield and the fourth shield; A first terminal electrically connected to the first shield; A second terminal electrically connected to the second shield; A third terminal electrically connected to the third shield; A fourth terminal electrically connected to the fourth shield; A first conductive member including at least one selected from the group consisting of Cu, Al, Au, and Ag; A first insulating layer, wherein at least a part of the first insulating layer is provided between the first conductive member and the first magnetic member; the first insulating layer; A magnetic head including the above. **Claim 8** The magnetic head according to claim 7, wherein a third direction from the first magnetic member to the first conductive member intersects a plane including the first direction and the second direction. **Claim 9** Further comprising a recording section including a first magnetic pole, The third shield overlaps a part of the first magnetic pole in the first direction, The magnetic head according to claim 1 or 2, wherein at least a part of the third shield conductive member does not overlap the first magnetic pole in the first direction. **Claim 10** The magnetic head according to claim 1, A magnetic recording medium facing the magnetic head, A first circuit, A second circuit, Comprising the above. The first circuit is configured to supply a current between the third terminal and the fourth terminal. The second circuit is configured to detect a voltage between the first terminal and the second terminal. The voltage is configured to change according to a magnetization state recorded on the magnetic recording medium, and is a magnetic recording device.

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