Magnetic Head and Magnetic Recording Device

Abstract

The present disclosure provides a magnetic head and a magnetic recording apparatus capable of achieving an increase in recording density. According to an embodiment, the magnetic head includes a first magnetic pole, a second magnetic pole, and a laminate provided between the first magnetic pole and the second magnetic pole. A third magnetic layer included in the laminate contains (Fe 100‑x Co x ), 100‑y E y , a second element E includes at least one selected from Cr, V, Mn, Ti, and Sc, where 10 atm% ≤ x ≤ 50 atm% and 10 atm% ≤ y ≤ 90 atm%.

Description

[0001] This application is based on Japanese Patent Application No. 2021-125149 (filing date: July 30, 2021), and claims priority therefrom. This application incorporates the entire content of that application by reference thereto. Technical Field

[0002] Embodiments of the present invention relate to a magnetic head and a magnetic recording device. Background Art

[0003] A magnetic head is used to record information on a magnetic recording medium such as an HDD (Hard Disk Drive). In magnetic heads and magnetic recording devices, an increase in recording density is desired. Summary of the Invention

[0004] Embodiments of the present invention provide a magnetic head and a magnetic recording device capable of achieving an increase in recording density.

[0005] Technical Solution for Solving the Problem

[0006] According to an embodiment of the present invention, a magnetic head includes a first magnetic pole, a second magnetic pole, and a laminate disposed between the first magnetic pole and the second magnetic pole. The laminate includes a first magnetic layer, a second magnetic layer disposed between the first magnetic layer and the second magnetic pole, a third magnetic layer disposed between the second magnetic layer and the second magnetic pole, a first non-magnetic layer disposed between the first magnetic layer and the second magnetic layer, a second non-magnetic layer disposed between the second magnetic layer and the third magnetic layer, a third non-magnetic layer disposed between the first magnetic pole and the first magnetic layer, and a fourth non-magnetic layer disposed between the third magnetic layer and the second magnetic pole. The fourth non-magnetic layer contains at least one selected from Cu, Au, Cr, Al, V, and Ag. The third magnetic layer contains (Fe 100-x Co x ) 100-y E y (10 atm% ≤ x ≤ 50 atm%, 10 atm% ≤ y ≤ 90 atm%). The second element E contains at least one selected from Cr, V, Mn, Ti, and Sc. The first magnetic pole length of the first magnetic pole along the second direction is shorter than the second magnetic pole length of the second magnetic pole along the second direction. The second direction is perpendicular to the first direction from the first magnetic layer to the second magnetic layer and along the medium facing surface of the first magnetic pole. The first magnetic layer length of the first magnetic layer along the third direction is longer than the second magnetic layer length of the second magnetic layer along the third direction. The third direction is perpendicular to the first direction.

[0007] A magnetic head according to the above structure can provide a magnetic head and a magnetic recording device capable of achieving an increase in recording density. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 (a) of Figure 1 and (b) of are schematic views illustrating the magnetic head of the first embodiment.

[0009] Figure 2 is a schematic cross-sectional view illustrating the magnetic recording device of the first embodiment.

[0010] Figure 3 (a) of Figure 3 and (b) of are schematic views illustrating the magnetic head of the first embodiment.

[0011] Figure 4 (a) of Figure 4 and (b) of are schematic views illustrating the magnetic head of the first embodiment.

[0012] Figure 5 is a schematic cross-sectional view illustrating the magnetic head of the first embodiment.

[0013] Figure 6 is a schematic cross-sectional view illustrating the magnetic head of the first embodiment.

[0014] Figure 7 is a schematic plan view illustrating the magnetic head of the first embodiment.

[0015] Figure 8 is a schematic plan view illustrating the magnetic head of the first embodiment.

[0016] Figure 9 (a) of Figure 9 and (b) of are schematic views illustrating the magnetic head of the second embodiment.

[0017] Figure 10 (a) of Figure 10 and (b) of are schematic views illustrating the magnetic head of the second embodiment.

[0018] Figure 11 is a schematic cross-sectional view illustrating the magnetic head of the second embodiment.

[0019] Figure 12 is a schematic cross-sectional view illustrating the magnetic head of the second embodiment.

[0020] Figure 13 is a schematic plan view illustrating the magnetic head of the second embodiment.

[0021] Figure 14 is a schematic plan view illustrating the magnetic head of the second embodiment.

[0022] Figure 15 (a) of Figure 15 and (b) of Figure 15 are graphs showing the characteristics of the magnetic layer included in the magnetic head.

[0023] Figure 16 are graphs showing the characteristics of the magnetic layer included in the magnetic head.

[0024] Figure 17 are graphs showing the characteristics of the magnetic layer included in the magnetic head.

[0025] Figure 18 is a schematic perspective view illustrating the magnetic recording apparatus of the embodiment.

[0026] Figure 19 is a schematic perspective view illustrating a part of the magnetic recording apparatus of the embodiment.

[0027] Figure 20 is a schematic perspective view illustrating the magnetic recording apparatus of the embodiment.

[0028] Figure 21 (a) of Figure 21 and (b) of Figure 21 are schematic perspective views illustrating a part of the magnetic recording apparatus of the embodiment.

[0029] Description of Reference Numerals

[0030] 20... laminate, 20D... circuit, 21 - 23... first - third magnetic layers, 21M, 22M... magnetization, 25a - 25c... magnetic layers, 30D... recording circuit, 30F... medium opposing surface, 30c... coil, 30i... insulating part, 31, 32... first, second magnetic poles, 31M, 32M... magnetic fields, 33... shield, 41 - 44... first - fourth non - magnetic layers, 45a - 45d... non - magnetic layers, 60... recording part, 70... reproducing part, 71... magnetic reproducing element, 72a, 72b... first, second reproducing magnetic shields, 80... magnetic recording medium, 81... magnetic recording layer, 82... medium substrate, 83... magnetization, 85... medium moving direction, θ1... angle, 110 - 115, 118, 120 - 125... magnetic heads, 150... magnetic recording device, 154... suspension, 155... arm, 156... voice coil motor, 157... bearing part, 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 part, 210... magnetic recording device, AR, AR1... arrows, Bm1... saturation magnetic flux density, D1 - D3... first - third directions, Iw... recording current, L21, L22... lengths of the first, second magnetic layers, OS... oscillation intensity, Ps1... spin polarization, SNR... SNR ratio, T1, T2... first, second terminals, W1, W2... first, second wirings, ic... current, je... electron flow, t21 - t23... thicknesses of the first - third magnetic layers, t41 - t44... thicknesses of the first - fourth non - magnetic layers, w1, w2... lengths of the first, second magnetic poles Detailed Description of the Embodiment

[0031] (First Embodiment)

[0032] Figure 1 of (a) and Figure 1 of (b) are schematic views illustrating the magnetic head of the first embodiment.

[0033] Figure 1 of (a) is a cross - sectional view. Figure 1 of (b) is a plan view when viewed from the arrow AR1 Figure 1 of (a).

[0034] Figure 2 is a schematic cross - sectional view illustrating the magnetic recording device of the first embodiment.

[0035] As Figure 2As shown, the magnetic recording device 210 of the embodiment includes a magnetic head 110 and a circuit 20D. The magnetic recording device 210 may also include a magnetic recording medium 80. In the magnetic recording device 210, at least a recording operation is performed. In the recording operation, information is recorded on the magnetic recording medium 80 using the magnetic head 110.

[0036] The magnetic head 110 includes a recording section 60. As described later, the magnetic head 110 may also include a reproducing section. The recording section 60 includes a first magnetic pole 31, a second magnetic pole 32, and a laminate 20. The laminate 20 is disposed between the first magnetic pole 31 and the second magnetic pole 32.

[0037] For example, the first magnetic pole 31 and the second magnetic pole 32 form a magnetic circuit. The first magnetic pole 31 is, for example, a main magnetic pole. The second magnetic pole 32 is, for example, a trailing shield.

[0038] The direction from the magnetic recording medium 80 to the magnetic head 110 is defined as the Z-axis direction. One direction perpendicular to the Z-axis direction is defined as the X-axis direction. The direction perpendicular to the Z-axis direction and the X-axis direction is defined as the Y-axis direction. The Z-axis direction corresponds, for example, to the height direction. The X-axis direction corresponds, for example, to the along-track direction. The Y-axis direction corresponds, for example, to the cross-track direction. The magnetic recording medium 80 and the magnetic head 110 move relative to each other along the along-track direction. A magnetic field (recording magnetic field) generated from the magnetic head 110 is applied to a desired position of the magnetic recording medium 80. The magnetization of the desired position of the magnetic recording medium 80 is controlled to a direction corresponding to the recording magnetic field. Thereby, information is recorded on the magnetic recording medium 80.

[0039] The direction from the first magnetic pole 31 to the second magnetic pole 32 is defined as the first direction D1. The first direction D1 substantially follows the X-axis direction. In the embodiment, the first direction D1 may be inclined at a small angle with respect to the X-axis direction.

[0040] As Figure 2 shown, a coil 30c is provided. In this example, a part of the coil 30c is between the first magnetic pole 31 and the second magnetic pole 32. In this example, a shield 33 is provided. In the X-axis direction, the first magnetic pole 31 is between the shield 33 and the second magnetic pole 32. Another part of the coil 30c is between the shield 33 and the first magnetic pole 31. An insulating portion 30i is provided between these multiple elements. The shield 33 is, for example, a guide shield. The magnetic head 110 may also include side shields (not shown).

[0041] As Figure 2 shown, a recording current Iw is supplied from the recording circuit 30D to the coil 30c. A recording magnetic field corresponding to the recording current Iw is applied from the first magnetic pole 31 to the magnetic recording medium 80.

[0042] AsFigure 2 As shown, the first magnetic pole 31 includes a medium facing surface 30F. The medium facing surface 30F is, for example, an ABS (Air Bearing Surface). The medium facing surface 30F faces the magnetic recording medium 80, for example. The medium facing surface 30F is along the X-Y plane, for example.

[0043] As Figure 2 shown, the circuit 20D is electrically connected to the laminate 20. In this example, the laminate 20 is electrically connected to the first magnetic pole 31 and the second magnetic pole 32. The first terminal T1 and the second terminal T2 are provided on the magnetic head 110. The first terminal T1 is electrically connected to the laminate 20 via the first wiring W1 and the first magnetic pole 31. The second terminal T2 is electrically connected to the laminate 20 via the second wiring W2 and the second magnetic pole 32. A current (for example, a direct current) is supplied from the circuit 20D to the laminate 20, for example.

[0044] As Figure 1 shown in (a) of Figure 1 and (b) of Figure 1 shown in (a) of Figure 1 and (b) of

[0045] The second magnetic layer 22 is provided between the first magnetic layer 21 and the second magnetic pole 32. The third magnetic layer 23 is provided between the second magnetic layer 22 and the second magnetic pole 32. The first non-magnetic layer 41 is provided between the first magnetic layer 21 and the second magnetic layer 22. The second non-magnetic layer 42 is provided between the second magnetic layer 22 and the third magnetic layer 23. The third non-magnetic layer 43 is provided between the first magnetic pole 31 and the first magnetic layer 21. The fourth non-magnetic layer 44 is provided between the third magnetic layer 23 and the second magnetic pole 32.

[0046] The first non-magnetic layer 41 can be in contact with the first magnetic layer 21 and the second magnetic layer 22, for example. The second non-magnetic layer 42 can be in contact with the second magnetic layer 22 and the third magnetic layer 23, for example. The third non-magnetic layer 43 can be in contact with the first magnetic pole 31 and the first magnetic layer 21, for example. The fourth non-magnetic layer 44 can be in contact with the third magnetic layer 23 and the second magnetic pole 32, for example.

[0047] As Figure 1 shown in (a) of

[0048] The direction perpendicular to the first direction D1 and along the medium opposing surface 30F of the first magnetic pole 31 is defined as the second direction D2. The second direction D2 is, for example, the Y-axis direction (track crossing direction).

[0049] As Figure 1 shown in (b) of , the length of the first magnetic pole 31 along the second direction D2 is defined as the first magnetic pole length w1. The length of the second magnetic pole 32 along the second direction D2 is defined as the second magnetic pole length w2. These lengths can also be widths. The first magnetic pole length w1 is shorter than the second magnetic pole length w2.

[0050] The first magnetic pole length w1 can be, in practical terms, the length of the first magnetic pole 31 along the second direction D2 (Y-axis direction) at the center position of the first magnetic pole 31 in the X-axis direction. The second magnetic pole length w2 can be, in practical terms, the length of the second magnetic pole 32 along the second direction D2 (Y-axis direction) at the center position of the second magnetic pole 32 in the X-axis direction.

[0051] Since the first magnetic pole length w1 is shorter than the second magnetic pole length w2, the magnetic field from the first magnetic pole 31 can easily enter the second magnetic pole 32, and the second magnetic pole 32 can easily function as a trailing shield.

[0052] As Figure 1 shown in (a) of , one direction perpendicular to the first direction D1 is defined as the third direction D3. In this example, the third direction D3 intersects the second direction D2. The third direction D3 is, for example, perpendicular to the second direction D2. In this example, since the first direction D1 is inclined with respect to the medium opposing surface 30F, the third direction D3 is inclined with respect to the medium opposing surface 30F.

[0053] The length of the first magnetic layer 21 along the third direction D3 is defined as the first magnetic layer length L21. The length of the second magnetic layer 22 along the third direction D3 is defined as the second magnetic layer length L22. The first magnetic layer length L21 is longer than the second magnetic layer length L22. As will be described later, due to such a length relationship, stable oscillation can be easily obtained in the laminate 20.

[0054] As Figure 1 shown in (b) of , a current ic is supplied to such a laminate 20. The current ic is supplied, for example, from the above-described circuit 20D. As Figure 1 shown in (b) of , the current ic has a direction from the first magnetic layer 21 toward the second magnetic layer 22. As Figure 1 shown in (a) of and Figure 1 shown in (b) of , the electron flow je accompanying the current ic has a direction from the second magnetic layer 22 toward the first magnetic layer 21.

[0055] For example, a current ic above a threshold value flows through the laminate 20, causing magnetization oscillation in the laminate 20. The laminate 20 functions as an STO (Spin-Torque Oscillator), for example. Along with the oscillation, an alternating magnetic field (e.g., a high-frequency magnetic field) is generated from the laminate 20. The alternating magnetic field generated in the laminate 20 is applied to the magnetic recording medium 80, assisting the writing to the magnetic recording medium 80. For example, MAMR (Microwave Assisted Magnetic Recording) can be implemented.

[0056] In the magnetic head 110, the first magnetic layer 21 and the second magnetic layer 22 function as oscillation layers, for example. The third magnetic layer 23 functions as a spin injection layer. The magnetization of the third magnetic layer 23 is not fixed in a specific direction. During operation, the orientation of the magnetization of the third magnetic layer 23 can change.

[0057] For example, the spin torque reflected at the first magnetic pole 31 acts on the first magnetic layer 21. For example, the transmitted spin torque from the third magnetic layer 23 is injected into the second magnetic layer 22. In the first magnetic layer 21 and the second magnetic layer 22, magnetizations in opposite directions are generated, and it is considered that these magnetizations are likely to oscillate stably.

[0058] In the magnetic head 110, the fourth non-magnetic layer 44 contains at least one selected from Cu, Au, Cr, Al, V, and Ag, for example. The third magnetic layer 23 contains (Fe 100-x Co x ) 100-y E y (10 atm% ≤ x ≤ 50 atm%, 10 atm% ≤ y ≤ 90 atm%), and the second element E contains at least one selected from Cr, V, Mn, Ti, and Sc.

[0059] The first magnetic layer 21 and the second magnetic layer 22 do not contain the above-mentioned second element. Alternatively, the concentration of the second element in the first magnetic layer 21 and the second magnetic layer 22 is lower than the concentration of the second element in the third magnetic layer 23. The first magnetic layer 21 contains at least one of Fe, Co, and Ni. The second magnetic layer 22 contains at least one of Fe, Co, and Ni.

[0060] For example, the first magnetic layer 21 and the second magnetic layer 22 have a positive spin polarization. The third magnetic layer 23 has a negative spin polarization. In such a laminate 20, high-efficiency oscillation can be obtained.

[0061] For example, the transmitted self-rotation torque from the second magnetic pole 32 is injected into the third magnetic layer 23. In the third magnetic layer 23, magnetization parallel to the magnetization of the second magnetic pole 32 is generated, and it can be considered that the transmitted self-rotation torque from the third magnetic layer 23 to the second magnetic layer 22 is stable. It can be considered that the magnetizations of the first magnetic layer 21 and the second magnetic layer 22 are easily oscillated.

[0062] Figure 3 (a) of Figure 3 and (b) of

[0063] Figure 3 are schematic cross-sectional views illustrating a magnetic head. Figure 1 (a) of Figure 1 corresponds to the magnetic head 110 of the embodiment. In the magnetic head 110, the size of the first magnetic layer 21 (the first magnetic layer length L21, refer to Figure 3 is larger than the size of the second magnetic layer 22 (the second magnetic layer length L22, refer to Figure 3 (a) of Figure 3 ).

[0064] As Figure 3 shown in (b) of

[0065] , the magnetic field 31M based on the influence of the first magnetic layer 21 is generated at the first magnetic pole 31. The magnetic field 32M based on the influence of the second magnetic layer 22 is generated at the second magnetic pole 32. In the magnetic head 118 of the reference example, since the size of the first magnetic layer 21 is the same as the size of the second magnetic layer 22, the magnetic field 31M is substantially the same as the magnetic field 32M. Figure 3 In contrast, as shown in (a) of

[0066] , in the case of the magnetic head 110 in which the size of the first magnetic layer 21 is larger than the size of the second magnetic layer 22, the magnetic field 31M based on the influence of the first magnetic layer 21 becomes larger, and the magnetic field 32M based on the influence of the second magnetic layer 22 is small or substantially not generated.

[0067] In an embodiment, stable oscillation is easily obtained in the laminate 20. Thus, stable MAMR can be implemented. According to the embodiment, a magnetic head capable of achieving an increase in recording density can be provided.

[0068] In an embodiment, the first nonmagnetic layer 41 contains, for example, at least one first element selected from Ru, Ir, Ta, and W. The thickness of the first nonmagnetic layer 41 along the first direction D1 is defined as the first nonmagnetic layer thickness t41 (refer to Figure 1 (b)). In an embodiment, the first nonmagnetic layer thickness t41 is, for example, 0.2 nm or more and 3 nm or less. With such a structure, the first magnetic layer 21 and the second magnetic layer 22 are easily antiferromagnetically coupled.

[0069] When the first magnetic layer 21 and the second magnetic layer 22 are antiferromagnetically coupled, for example, the perpendicular component (the component along the Z-axis direction) of the alternating magnetic field generated from the laminate 20 is suppressed. On the other hand, the in-plane component (the component along the X-Y plane) of the alternating magnetic field is enhanced. In an embodiment, when the perpendicular component (the component along the Z-axis direction) of the alternating magnetic field generated from the laminate 20 is suppressed, for example, the SNR is improved.

[0070] In an embodiment, the magnetic thickness of the first magnetic layer 21 may be substantially the same as the magnetic thickness of the second magnetic layer 22. For example, the thickness of the first magnetic layer 21 along the first direction D1 (the first magnetic layer thickness t21) and the first product of the saturation magnetization of the first magnetic layer 21 may be substantially the same as the thickness of the second magnetic layer 22 along the first direction D1 (the second magnetic layer thickness t22) and the second product of the saturation magnetization of the second magnetic layer 22. For example, the first product may be 0.8 times or more and 1.25 times or less of the second product.

[0071] For example, the second magnetic layer thickness t22 may be 0.8 times or more and 1.25 times or less of the first magnetic layer thickness t21.

[0072] In an embodiment, the first magnetic layer thickness t21 is, for example, 5 nm or more and 15 nm or less. In one example, the first magnetic layer thickness t21 is, for example, 8 nm or more and 10 nm or less. The second magnetic layer thickness t22 is, for example, 5 nm or more and 15 nm or less. In one example, the second magnetic layer thickness t22 is, for example, 8 nm or more and 10 nm or less.

[0073] The thickness of the third magnetic layer 23 along the first direction D1 is defined as the third magnetic layer thickness t23 (refer to Figure 1(b)). The thickness t23 of the third magnetic layer is, for example, thinner than the thickness t21 of the first magnetic layer and thinner than the thickness t22 of the second magnetic layer. The thickness t23 of the third magnetic layer is, for example, 0.7 times or less of the thickness t21 of the first magnetic layer and 0.7 times or less of the thickness t22 of the second magnetic layer. The thickness t23 of the third magnetic layer is, for example, 0.5 nm or more and 6 nm or less. The thickness t23 of the third magnetic layer may also be, for example, 1 nm or more and 5 nm or less.

[0074] The thickness of the second non-magnetic layer 42 along the first direction D1 is defined as the second non-magnetic layer thickness t42 (see Figure 1 (b)). The second non-magnetic layer thickness t42 is, for example, 1 nm or more and 5 nm or less. The thickness of the third non-magnetic layer 43 along the first direction D1 is defined as the third non-magnetic layer thickness t43 (see Figure 1 (b)). The third non-magnetic layer thickness t43 is, for example, 1 nm or more and 5 nm or less. The thickness of the fourth non-magnetic layer 44 along the first direction D1 is defined as the fourth non-magnetic layer thickness t44 (see Figure 1 (b)). The fourth non-magnetic layer thickness t44 is, for example, 1 nm or more and 5 nm or less. With such thicknesses, for example, spin conduction between layers becomes easier. For example, stable oscillation is easily obtained.

[0075] In the embodiment, the second non-magnetic layer 42 and the third non-magnetic layer 43 contain, for example, at least one selected from Cu, Au, Cr, Al, V, and Ag. In the second non-magnetic layer 42 and the third non-magnetic layer 43, for example, a high spin transmittance can be obtained. For example, stable oscillation is easily obtained.

[0076] In the magnetic head 110, the angle θ1 between the first direction D1 and the medium facing surface 30F (see Figure 1 (a)) can be, for example, 10 degrees or more and 30 degrees or less.

[0077] Figure 4 (a) and Figure 4 (b) are schematic views illustrating the magnetic head of the first embodiment.

[0078] Figure 4 (a) is a cross-sectional view. Figure 4 (b) is a plan view when viewed from the arrow AR1 in Figure 4 (a).

[0079] As shown in Figure 4 (a), the recording portion 60 of the magnetic head 111 also includes a first magnetic pole 31, a second magnetic pole 32, and a laminate 20 disposed between the first magnetic pole 31 and the second magnetic pole 32. As shown in Figure 4 (a) and (a) and Figure 4As shown in FIG. (b), the laminate 20 includes first to third magnetic layers 21 to 23 and first to third non-magnetic layers 41 to 43. The second magnetic layer 22 is disposed between the first magnetic layer 21 and the second magnetic pole 32. The third magnetic layer 23 is disposed between the second magnetic layer 22 and the second magnetic pole 32. The first non-magnetic layer 41 is disposed between the first magnetic layer 21 and the second magnetic layer 22. The second non-magnetic layer 42 is disposed between the second magnetic layer 22 and the third magnetic layer 23. The third non-magnetic layer 43 is disposed between the first magnetic pole 31 and the first magnetic layer 21. For example, the third magnetic layer 23 may be in contact with the second magnetic pole 32. For example, the magnetization of the third magnetic layer 23 and the magnetization of the second magnetic pole 32 are coupled, and it can be considered that the spin torque transmitted from the third magnetic layer 23 to the second magnetic layer 22 is stable. It can be considered that the magnetizations of the first magnetic layer 21 and the second magnetic layer 22 are easily oscillated.

[0080] In the magnetic head 111, the first magnetic layer 21 contains at least one of Fe, Co, and Ni. The second magnetic layer 22 contains at least one of Fe, Co, and Ni. The third magnetic layer 23 contains, for example, (Fe 100-x Co x ) 100-y E y (10 atm% ≤ x ≤ 50 atm%, 10 atm% ≤ y ≤ 90 atm%), and the second element E contains at least one selected from Cr, V, Mn, Ti, and Sc.

[0081] The first magnetic layer 21 and the second magnetic layer 22 do not contain the above-mentioned second element. Alternatively, the concentration of the second element in the first magnetic layer 21 and the second magnetic layer 22 is lower than the concentration of the second element in the third magnetic layer 23. The first magnetic layer 21 contains at least one of Fe, Co, and Ni. The second magnetic layer 22 contains at least one of Fe, Co, and Ni.

[0082] For example, the first magnetic layer 21 and the second magnetic layer 22 have positive spin polarizations. The third magnetic layer 23 has a negative spin polarization.

[0083] As the structure other than the above in the magnetic head 111, the structure described with respect to the magnetic head 110 can be applied. For example, the length L21 of the first magnetic layer is longer than the length L22 of the second magnetic layer. In the magnetic head 111, stable oscillation can also be obtained.

[0084] For example, as Figure 4 shown in FIG. (b), a current ic is supplied to the laminate 20. The current ic is supplied from a circuit 20D (see Figure 2 ). The current ic has a direction from the first magnetic layer 21 to the second magnetic layer 22. The electron flow je accompanying the current ic has a direction from the second magnetic layer 22 to the first magnetic layer 21.

[0085] Figure 5 It is a schematic cross-sectional view illustrating the magnetic head of the first embodiment.

[0086] As Figure 5 shown, in the magnetic head 112 of the embodiment, the first direction D1 (lamination direction) is along the medium facing surface 30F. In the magnetic head 112, for example, the length L21 of the first magnetic layer is also longer than the length L22 of the second magnetic layer. Other structures in the magnetic head 112 may be the same as those of the magnetic head 110.

[0087] Figure 6 It is a schematic cross-sectional view illustrating the magnetic head of the first embodiment.

[0088] As Figure 6 shown, in the magnetic head 113 of the embodiment, the first direction D1 (lamination direction) is along the medium facing surface 30F. In the magnetic head 113, for example, the length L21 of the first magnetic layer is also longer than the length L22 of the second magnetic layer. Other structures in the magnetic head 113 may be the same as those of the magnetic head 111.

[0089] Figure 7 It is a schematic plan view illustrating the magnetic head of the first embodiment.

[0090] Figure 7 Corresponding to the plan view when viewed from the arrow AR1 of (a) in Figure 1 . As Figure 7 shown, in the magnetic head 114 of the embodiment, the laminate 20 includes first to third magnetic layers 21 to 23 and first to fourth non-magnetic layers 41 to 44. As Figure 7 shown, the third direction D3 is along the second direction D2 (Y-axis direction, track crossing direction). The length L21 of the first magnetic layer 21 along the third direction D3 is longer than the length L22 of the second magnetic layer 22 along the third direction D3. Other structures in the magnetic head 114 may be the same as those of the magnetic head 110.

[0091] Figure 8 It is a schematic plan view illustrating the magnetic head of the first embodiment.

[0092] Figure 8 Corresponding to the plan view when viewed from the arrow AR1 of (a) in Figure 4 . As Figure 8 shown, in the magnetic head 115 of the embodiment, the laminate 20 includes first to third magnetic layers 21 to 23 and first to third non-magnetic layers 41 to 43. As Figure 8As shown, the third direction D3 is along the second direction D2 (Y-axis direction, cross-track direction). The first magnetic layer length L21 of the first magnetic layer 21 along the third direction D3 is longer than the second magnetic layer length L22 of the second magnetic layer 22 along the third direction D3. Other structures in the magnetic head 115 may be the same as those in the magnetic head 111.

[0093] In the magnetic heads 112 to 115, stable oscillation can also be obtained.

[0094] (Second Embodiment)

[0095] Figure 9 of (a) and Figure 9 of (b) are schematic views illustrating the magnetic head of the second embodiment.

[0096] Figure 9 of (a) is a cross-sectional view. Figure 9 of (b) is a plan view when viewed from the arrow AR1 of Figure 9 of (a).

[0097] As Figure 9 shown in (a) of, the magnetic head 120 of the embodiment also includes a first magnetic pole 31, a second magnetic pole 32, and a laminate 20 provided between the first magnetic pole 31 and the second magnetic pole 32. In the magnetic head 120, the order of the plurality of layers included in the laminate 20 is different from the order of the plurality of layers in the magnetic head 110. Other structures in the magnetic head 120 may be the same as those of the magnetic head 110.

[0098] As Figure 9 shown in (a) of and Figure 9 shown in (b) of, in the magnetic head 120, the laminate 20 includes first to third magnetic layers 21 to 23 and first to fourth non-magnetic layers 41 to 44. The second magnetic layer 22 is provided between the first magnetic pole 31 and the first magnetic layer 21. The third magnetic layer 23 is provided between the first magnetic pole 31 and the second magnetic layer 22. The first non-magnetic layer 41 is provided between the second magnetic layer 22 and the first magnetic layer 21. The second non-magnetic layer 42 is provided between the third magnetic layer 23 and the second magnetic layer 22. The third non-magnetic layer 43 is provided between the first magnetic layer 21 and the second magnetic pole 32. The fourth non-magnetic layer 44 is provided between the first magnetic pole 31 and the third magnetic layer 23.

[0099] As Figure 9 shown in (b) of, a current ic is supplied to the laminate 20. The current ic is supplied from a circuit 20D (see Figure 2 ). The current ic has an orientation from the first magnetic layer 21 to the second magnetic layer 22. The electron flow je accompanying the current ic has an orientation from the second magnetic layer 22 to the first magnetic layer 21.

[0100] For example, the self-rotation torque reflected by the second magnetic pole 32 acts on the first magnetic layer 21. For example, the transmitted self-rotation torque from the third magnetic layer 23 is injected into the second magnetic layer 22. In the first magnetic layer 21 and the second magnetic layer 22, magnetizations in opposite directions are generated, and it is considered that these magnetizations are likely to oscillate stably. The first magnetic layer 21 and the second magnetic layer 22 function as oscillation layers, for example. The third magnetic layer 23 functions as a spin injection layer. The magnetization of the third magnetic layer 23 is not fixed in a specific direction. In the magnetic head 120, MAMR can be implemented.

[0101] The direction from the second magnetic layer 22 to the first magnetic layer 21 is defined as the first direction D1. The direction perpendicular to the first direction D1 and along the medium facing surface 30F of the first magnetic pole 31 is defined as the second direction D2. The second direction D2 is, for example, the Y-axis direction (track cross direction). As Figure 9 shown in (b) of, the first magnetic pole length w1 of the first magnetic pole 31 along the second direction D2 is shorter than the second magnetic pole length w2 of the second magnetic pole 32 along the second direction D2.

[0102] As Figure 9 shown in (a) of, one direction perpendicular to the first direction D1 is defined as the third direction D3. In this example, the third direction D3 intersects the second direction D2. In this example, the first direction D1 is inclined with respect to the medium facing surface 30F. The third direction D3 is inclined with respect to the medium facing surface 30F. The second magnetic layer length L22 of the second magnetic layer 22 along the third direction D3 is longer than the first magnetic layer length L21 of the first magnetic layer 21 along the third direction D3.

[0103] With such a structure, the magnetic field 31M in the first magnetic pole 31 can be increased. And the magnetic field 32M in the second magnetic pole 32 can be suppressed. Thereby, the interaction between the first magnetic pole 31 and the laminate 20 can be increased. The noise generated at the second magnetic pole 32 can be suppressed.

[0104] In the embodiment, stable oscillation is easily obtained in the laminate 20. Thereby, stable MAMR can be implemented. According to the embodiment, a magnetic head capable of achieving an increase in recording density can be provided.

[0105] In the magnetic head 120, the fourth non-magnetic layer 44 contains, for example, at least one selected from Cu, Au, Cr, Al, V, and Ag. The third magnetic layer 23 contains, for example, (Fe 100-x Co x ) 100-y E y (10 atm% ≤ x ≤ 50 atm%, 10 atm% ≤ y ≤ 90 atm%), and the second element E contains at least one selected from Cr, V, Mn, Ti, and Sc.

[0106] The first magnetic layer 21 and the second magnetic layer 22 do not contain the above-mentioned second element. Alternatively, the concentration of the second element in the first magnetic layer 21 and the second magnetic layer 22 is lower than the concentration of the second element in the third magnetic layer 23. The first magnetic layer 21 contains at least one of Fe, Co, and Ni. The second magnetic layer 22 contains at least one of Fe, Co, and Ni.

[0107] For example, the first magnetic layer 21 and the second magnetic layer 22 have positive spin polarization. The third magnetic layer 23 has negative spin polarization. In such a laminate 20, high-efficiency oscillation can be obtained.

[0108] For example, the transmitted spin torque from the first magnetic pole 31 is injected into the third magnetic layer 23. In the third magnetic layer 23, magnetization parallel to the magnetization of the first magnetic pole 31 is generated, and it is considered that the transmitted spin torque from the third magnetic layer 23 to the second magnetic layer 22 is stable. It is considered that the magnetization of the first magnetic layer 21 and the second magnetic layer 22 is easily oscillated.

[0109] In the magnetic head 120, the structure described for the magnetic head 110 can be applied. For example, in the magnetic head 120, the first non-magnetic layer 41 contains at least one first element selected from Ru, Ir, Ta, and W. The first non-magnetic layer thickness t41 of the first non-magnetic layer 41 along the first direction D1 (refer to Figure 9 of (b)) is, for example, 0.2 nm or more and 3 nm or less. By antiferromagnetically coupling the first magnetic layer 21 and the second magnetic layer 22, for example, the magnetic field based on the magnetization of the first magnetic layer 21 and the magnetic field based on the magnetization of the second magnetic layer 22 are substantially canceled. As a result, the vertical component (the component along the Z-axis direction) of the alternating magnetic field generated from the laminate 20 is suppressed. On the other hand, the in-plane component (the component along the X-Y plane) of the alternating magnetic field is enhanced. In the embodiment, for example, the SNR is improved by suppressing the vertical component (the component along the Z-axis direction) of the alternating magnetic field generated from the laminate 20.

[0110] Figure 10 of (a) and Figure 10 of (b) are schematic views illustrating the magnetic head of the second embodiment.

[0111] Figure 10 of (a) is a cross-sectional view. Figure 10 of (b) is a plan view when viewed from the arrow AR1 of Figure 10 of (a).

[0112] As Figure 10 shown in (a) of, the recording section 60 of the magnetic head 121 also includes the first magnetic pole 31, the second magnetic pole 32, and the laminate 20 provided between the first magnetic pole 31 and the second magnetic pole 32. As Figure 10 of (a) andFigure 10 As shown in FIG. (b), the laminate 20 includes first to third magnetic layers 21 to 23 and first to third non-magnetic layers 41 to 43. The second magnetic layer 22 is disposed between the first magnetic layer 21 and the second magnetic pole 32. The third magnetic layer 23 is disposed between the second magnetic layer 22 and the second magnetic pole 32. The first non-magnetic layer 41 is disposed between the first magnetic layer 21 and the second magnetic layer 22. The second non-magnetic layer 42 is disposed between the second magnetic layer 22 and the third magnetic layer 23. The third non-magnetic layer 43 is disposed between the first magnetic pole 31 and the first magnetic layer 21. For example, the third magnetic layer 23 may be in contact with the second magnetic pole 32.

[0113] In the magnetic head 121, the first magnetic layer 21 contains at least one of Fe, Co, and Ni. The second magnetic layer 22 contains at least one of Fe, Co, and Ni. The third magnetic layer 23 contains, for example, (Fe 100-x Co x ) 100-y E y (10 atm% ≤ x ≤ 50 atm%, 10 atm% ≤ y ≤ 90 atm%), and the second element E contains at least one selected from Cr, V, Mn, Ti, and Sc.

[0114] The first magnetic layer 21 and the second magnetic layer 22 do not contain the above-described second element. Alternatively, the concentration of the second element in the first magnetic layer 21 and the second magnetic layer 22 is lower than the concentration of the second element in the third magnetic layer 23. The first magnetic layer 21 contains at least one of Fe, Co, and Ni. The second magnetic layer 22 contains at least one of Fe, Co, and Ni.

[0115] For example, the first magnetic layer 21 and the second magnetic layer 22 have a positive spin polarization. The third magnetic layer 23 has a negative spin polarization.

[0116] As the structure other than the above in the magnetic head 121, the structure described with respect to the magnetic head 120 can be applied. For example, the length L21 of the first magnetic layer is longer than the length L22 of the second magnetic layer. In the magnetic head 121, stable oscillation can also be obtained.

[0117] For example, as Figure 10 shown in FIG. (b), a current ic is supplied to the laminate 20. The current ic is supplied from the circuit 20D (see Figure 2 ). The current ic has a direction from the first magnetic layer 21 to the second magnetic layer 22. The electron flow je accompanying the current ic has a direction from the second magnetic layer 22 to the first magnetic layer 21.

[0118] Figure 11 is a schematic cross-sectional view illustrating the magnetic head of the second embodiment.

[0119] AsFigure 11 As shown, in the magnetic head 122 of the embodiment, the first direction D1 (stacking direction) is along the medium facing surface 30F. In the magnetic head 122, for example, the first magnetic layer length L21 is also longer than the second magnetic layer length L22. Other structures in the magnetic head 122 may be the same as those of the magnetic head 120.

[0120] Figure 12 It is a schematic cross-sectional view illustrating the magnetic head of the second embodiment.

[0121] As Figure 12 As shown, in the magnetic head 123 of the embodiment, the first direction D1 (stacking direction) is along the medium facing surface 30F. In the magnetic head 123, for example, the first magnetic layer length L21 is also longer than the second magnetic layer length L22. Other structures in the magnetic head 123 may be the same as those of the magnetic head 121.

[0122] Figure 13 It is a schematic plan view illustrating the magnetic head of the second embodiment.

[0123] Figure 13 Corresponding to the plan view when observed from the arrow AR1 in (a) of Figure 9 As Figure 13 As shown, in the magnetic head 124 of the embodiment, the stack 20 includes first to third magnetic layers 21 to 23 and first to fourth non-magnetic layers 41 to 44. As Figure 13 As shown, the third direction D3 is along the second direction D2 (Y-axis direction, track crossing direction). The first magnetic layer length L21 of the first magnetic layer 21 along the third direction D3 is longer than the second magnetic layer length L22 of the second magnetic layer 22 along the third direction D3. Other structures in the magnetic head 124 may be the same as those of the magnetic head 120.

[0124] Figure 14 It is a schematic plan view illustrating the magnetic head of the second embodiment.

[0125] Figure 14 Corresponding to the plan view when observed from the arrow AR1 in (a) of Figure 10 As Figure 14 As shown, in the magnetic head 125 of the embodiment, the stack 20 includes first to third magnetic layers 21 to 23 and first to third non-magnetic layers 41 to 43. As Figure 14 As shown, the third direction D3 is along the second direction D2 (Y-axis direction, track crossing direction). The first magnetic layer length L21 of the first magnetic layer 21 along the third direction D3 is longer than the second magnetic layer length L22 of the second magnetic layer 22 along the third direction D3. Other structures in the magnetic head 125 may be the same as those of the magnetic head 121.

[0126] In the magnetic heads 122 to 125, stable oscillation can also be obtained.

[0127] In the magnetic heads 111 to 115 and 120 to 125, the structures described for the magnetic head 110 can also be applied to the first to third magnetic layers 21 to 23 and the first to third non-magnetic layers 41 to 43.

[0128] For example, in the magnetic heads 111 to 115 and 120 to 125, the magnetic thickness of the first magnetic layer 21 can be 0.8 times or more and 1.25 times or less the magnetic thickness of the second magnetic layer 22. For example, the thickness t22 of the second magnetic layer can be 0.8 times or more and 1.25 times or less the thickness t21 of the first magnetic layer. The thickness t21 of the first magnetic layer is, for example, 5 nm or more and 15 nm or less. The thickness t22 of the second magnetic layer is, for example, 5 nm or more and 15 nm or less.

[0129] The thickness t23 of the third magnetic layer is, for example, thinner than the thickness t21 of the first magnetic layer and thinner than the thickness t22 of the second magnetic layer. The thickness t23 of the third magnetic layer is, for example, 0.7 times or less the thickness t21 of the first magnetic layer and 0.7 times or less the thickness t22 of the second magnetic layer. The first to third magnetic layers 21 to 23 contain at least one of Fe, Co, and Ni.

[0130] In the magnetic heads 111 to 115 and 120 to 125, the second non-magnetic layer 42 and the third non-magnetic layer 43 contain, for example, at least one selected from Cu, Au, Cr, Al, V, and Ag. The thickness t42 of the second non-magnetic layer is, for example, 1 nm or more and 5 nm or less. The thickness t43 of the third non-magnetic layer is, for example, 1 nm or more and 5 nm or less.

[0131] The magnetic heads 111 to 115 and 120 to 125 of the embodiment can also be used together with the circuit 20D (see Figure 2 ). The magnetic heads and the circuit 20D of the embodiment are included in the magnetic recording device 210 of the embodiment (see Figure 2 ). The magnetic recording device 210 may also include a magnetic recording medium 80.

[0132] Hereinafter, examples of the characteristics of the material of the third magnetic layer 23 will be described.

[0133] In the first embodiment and the second embodiment, the third magnetic layer 23 contains (Fe 100-x Co x ) 100-y E y(10 atm% ≤ x ≤ 50 atm%, 10 atm% ≤ y ≤ 90 atm%). The second element E includes at least one selected from Cr, V, Mn, Ti, and Sc. The composition ratios x and y are atomic percentages (atm%). The first magnetic layer 21 and the second magnetic layer 22 do not contain the second element E. Alternatively, the concentration of the second element E in the first magnetic layer 21 and the second magnetic layer 22 is lower than the concentration of the second element E in the third magnetic layer 23. With such materials, in the third magnetic layer 23, for example, it is easy to obtain a high saturation magnetic flux density and a negative and large absolute value of spin polarization.

[0134] Figure 15 of (a) and Figure 15 of (b) are graphs illustrating the characteristics of the magnetic layers included in the magnetic head.

[0135] Figure 15 of (a) illustrates the characteristics when the magnetic layer does not contain the second element. In this example, the magnetic layer contains Fe 100- x Co x . Figure 15 The horizontal axis of of (a) is the composition ratio x (concentration of Co). The vertical axis is the saturation magnetic flux density Bm1. As Figure 15 shown in of (a), when the composition ratio x is 10 atm% or more and 50 atm% or less, a high saturation magnetic flux density Bm1 can be obtained. When the composition ratio x is 75 atm% or less, the magnetic layer has a BCC structure. If the composition ratio x exceeds 75 atm%, the magnetic layer has an fcc structure.

[0136] Figure 15 of (b) illustrates the characteristics when the composition ratio of the second element in the magnetic layer is changed. Figure 15 The horizontal axis of of (b) is the composition ratio y. In this example, the second element E is Cr. The vertical axis is the saturation magnetic flux density Bm1. As Figure 15 shown in of (b), if the composition ratio y is high, a saturation magnetic flux density Bm1 can be obtained. When the magnetic layer contains Fe 50 Co 50 or Fe 90 Co 10 , substantially the same characteristics can be obtained. When the magnetic layer contains Fe 70 Co 30 , a higher saturation magnetic flux density Bm1 can be obtained at the same composition ratio y compared to other compositions. When the magnetic layer contains the second element, the composition ratio x is preferably 10 atm% or more and 50 atm% or less.

[0137] Figure 16 is a graph illustrating the characteristics of the magnetic layers included in the magnetic head.

[0138] Figure 16 Illustrates the change in the spin polarization of the magnetic layer when the composition ratio y is changed while the composition ratio of Co relative to Fe is fixed. Figure 16 The horizontal axis is the composition ratio y of the second element E. The vertical axis is the spin polarization Ps1 (the value of the spin polarization). As Figure 16 shown, when the composition ratio y of the second element E is 3 atm% or more, a negative spin polarization Ps1 can be obtained. If the composition ratio y is high, the absolute value of the negative spin polarization Ps1 becomes larger. When the composition ratio y is 10 atm% or more, a negative spin polarization Ps1 with a large absolute value can be obtained. For example, the composition ratio y can also be 10 atm% or more and 30 atm% or less.

[0139] From Figure 15 of (b) and Figure 16 it can be seen that in the embodiment, preferably, the composition ratio x of Co is 10 atm% or more and 50 atm% or less, and the composition ratio y of the second element E is 10 atm% or more. The composition ratio y of the second element E is preferably 90 atm% or less. Thereby, a high saturation magnetic flux density Bm1 can be obtained. In the embodiment, the composition ratio y of the second element E can also be 10 atm% or more and 50 atm% or less.

[0140] Figure 17 is a graph showing the characteristics of the magnetic layer included in the magnetic head.

[0141] Figure 17 Illustrates the oscillation strength OS when the composition of the third magnetic layer 23 is changed. In this example, the composition ratio y is 20 atm%, and the composition ratio x of Co is changed. The second element E is Cr. Figure 17 The horizontal axis of is the composition ratio x. The vertical axis is the oscillation strength OS. From Figure 17 it can be seen that when the composition ratio x is 10 atm% or more and 50 atm% or less, a high oscillation strength OS can be obtained. Under this condition, for example, it is easy to increase the recording density based on MAMR. The composition ratio x is more preferably 25 atm% or more and 35 atm% or less. It is easy to stably obtain a high oscillation strength OS.

[0142] Thus, the third magnetic layer 23 (for example, a magnetic layer having a negative spin polarization) preferably has the above composition. Thereby, for example, it is easy to obtain a high saturation magnetic flux density Bm1 and a negative spin polarization Ps1 with a large absolute value. For example, it is easy to obtain stable oscillation.

[0143] In an embodiment, the thickness t23 of the third magnetic layer 23 of the third magnetic layer is preferably, for example, 5 nm or more and 15 nm or less. The thickness t41 of the first non-magnetic layer 41 of the first non-magnetic layer and the thickness t42 of the second non-magnetic layer 42 of the second non-magnetic layer are each preferably, for example, 0.5 nm or more and 6 nm or less.

[0144] Figure 18 FIG. 4 is a schematic perspective view illustrating a magnetic recording apparatus according to an embodiment.

[0145] As Figure 18 shown, a magnetic head (for example, magnetic head 110) according to an embodiment is used together with a magnetic recording medium 80. In this example, the magnetic head 110 includes a recording section 60 and a reproducing section 70. Information is recorded on the magnetic recording medium 80 by the recording section 60 of the magnetic head 110. The information recorded on the magnetic recording medium 80 is reproduced by the reproducing section 70.

[0146] 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 section 60.

[0147] The reproducing section 70 includes, for example, a first reproducing magnetic shield 72a, a second reproducing magnetic shield 72b, and a magnetic reproducing element 71. The magnetic reproducing element 71 is provided between the first reproducing magnetic shield 72a and the second reproducing magnetic shield 72b. The magnetic reproducing element 71 can output a signal corresponding to the magnetization 83 of the magnetic recording layer 81.

[0148] As Figure 18 shown, the magnetic recording medium 80 moves relative to the magnetic head 110 in the direction of the medium movement direction 85. Information corresponding to the magnetization 83 of the magnetic recording layer 81 is controlled by the magnetic head 110 at an arbitrary position. Information corresponding to the magnetization 83 of the magnetic recording layer 81 is reproduced by the magnetic head 110 at an arbitrary position.

[0149] Figure 19 FIG. 24 is a schematic perspective view illustrating a part of a magnetic recording apparatus according to an embodiment.

[0150] Figure 19 A head slider is illustrated.

[0151] The magnetic head 110 is provided on the head slider 159. The head slider 159 includes, for example, Al2O3 / TiC or the like. The head slider 159 moves relative to the magnetic recording medium while floating or contacting the magnetic recording medium.

[0152] The head slider 159 has, for example, an air inflow side 159A and an air outflow side 159B. The magnetic head 110 is disposed on a side surface of the air outflow side 159B of the head slider 159 or the like. Accordingly, the magnetic head 110 moves relative to the magnetic recording medium while floating or contacting the magnetic recording medium.

[0153] Figure 20 is a schematic perspective view of a magnetic recording device according to an exemplary embodiment.

[0154] Figure 21 of (a) and Figure 21 of (b) are schematic perspective views of a part of a magnetic recording device according to an exemplary embodiment.

[0155] As Figure 20 shown, in the magnetic recording device 150 of the embodiment, a rotary actuator is used. The recording medium disk 180 is assembled to 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 device 150 of the present embodiment may also include a plurality of recording medium disks 180. The magnetic recording device 150 may also include a recording medium 181. The recording medium 181 is, for example, an SSD (Solid State Drive). For the recording medium 181, a non-volatile memory such as a flash memory is used, for example. For example, the magnetic recording device 150 may also be a hybrid HDD (Hard Disk Drive).

[0156] The head slider 159 records and reproduces information recorded on the recording medium disk 180. The head slider 159 is provided at the front end of the thin film-like suspension 154. A magnetic head according to the embodiment is provided near the front end of the head slider 159.

[0157] When the recording medium disk 180 rotates, the pressing pressure of 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 the embodiment, the head slider 159 may also contact the recording medium disk 180. For example, a contact start-stop type may be applied.

[0158] The suspension 154 is connected to one end of the 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 type 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 a relative yoke. The drive coil is provided between the permanent magnet and the relative 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.

[0159] The arm 155 is held by ball bearings. The ball bearings are provided at the upper and lower positions of the bearing portion 157. The arm 155 can rotate and slide by the voice coil motor 156. The magnetic head can move to any position on the recording medium disk 180.

[0160] Figure 21 Example (a) illustrates the structure of a part of the magnetic recording device and is an enlarged perspective view of the head stack assembly 160.

[0161] Figure 21 Example (b) is a perspective view illustrating the magnetic head assembly (head gimbal assembly: HGA) 158 which is a part of the head stack assembly 160.

[0162] As Figure 21 As shown in example (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.

[0163] As Figure 21 As shown in example (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.

[0164] A head slider 159 is provided at the front end of the suspension 154. The magnetic head of the embodiment is provided on the head slider 159.

[0165] The magnetic head assembly (head gimbal assembly) 158 of the embodiment includes the magnetic head of the embodiment, the head slider 159 provided with the magnetic head, the suspension 154, and the 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.

[0166] The suspension 154 has, for example, leads (not shown) for recording and reproducing signals. The suspension 154 may also have, for example, leads (not shown) for heaters for floating amount adjustment. The suspension 154 may also have, for example, leads (not shown) for spin transfer torque oscillators and the like. These leads are electrically connected to a plurality of electrodes provided on the magnetic head.

[0167] In the magnetic recording device 150, a signal processing unit 190 is provided. The signal processing unit 190 uses the magnetic head to record and reproduce signals on the magnetic recording medium. For the signal processing unit 190, 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.

[0168] The magnetic recording device 150 of the embodiment includes a magnetic recording medium, the magnetic head of the embodiment, a movable part, a position control part, and a signal processing part. The movable part enables the magnetic recording medium and the magnetic head to move relative to each other in a separated or contacting state. The position control part aligns the magnetic head to a predetermined recording position on the magnetic recording medium. The signal processing part performs recording and reproduction of signals using the magnetic head on the magnetic recording medium.

[0169] For example, as the above magnetic recording medium, a recording medium disk 180 is used. The above movable part includes, for example, a head slider 159. The above position control part includes, for example, a head gimbal assembly 158.

[0170] The embodiment may also include the following technical solutions.

[0171] (Technical solution 1)

[0172] A magnetic head includes:

[0173] A first magnetic pole;

[0174] A second magnetic pole; and

[0175] A laminate provided between the first magnetic pole and the second magnetic pole,

[0176] The laminate includes:

[0177] A first magnetic layer;

[0178] A second magnetic layer provided between the first magnetic layer and the second magnetic pole;

[0179] A third magnetic layer provided between the second magnetic layer and the second magnetic pole;

[0180] A first non-magnetic layer provided between the first magnetic layer and the second magnetic layer;

[0181] A second non-magnetic layer provided between the second magnetic layer and the third magnetic layer;

[0182] A third non-magnetic layer provided between the first magnetic pole and the first magnetic layer; and

[0183] A fourth non-magnetic layer provided between the third magnetic layer and the second magnetic pole,

[0184] The fourth non-magnetic layer contains at least one selected from Cu, Au, Cr, Al, V, and Ag,

[0185] The third magnetic layer contains (Fe 100-x Co x ) 100-y E y(10 atm% ≤ x ≤ 50 atm%, 10 atm% ≤ y ≤ 90 atm%), the second element E includes at least one selected from Cr, V, Mn, Ti, and Sc,

[0186] The first magnetic pole length of the first magnetic pole along the second direction is shorter than the second magnetic pole length of the second magnetic pole along the second direction. The second direction is perpendicular to the first direction from the first magnetic layer to the second magnetic layer and along the medium opposite surface of the first magnetic pole.

[0187] The first magnetic layer length of the first magnetic layer along the third direction is longer than the second magnetic layer length of the second magnetic layer along the third direction. The third direction is perpendicular to the first direction.

[0188] (Technical solution 2)

[0189] A magnetic head includes:

[0190] A first magnetic pole;

[0191] A second magnetic pole; and

[0192] A laminate disposed between the first magnetic pole and the second magnetic pole,

[0193] The laminate includes:

[0194] A first magnetic layer;

[0195] A second magnetic layer disposed between the first magnetic layer and the second magnetic pole;

[0196] A third magnetic layer disposed between the second magnetic layer and the second magnetic pole;

[0197] A first non-magnetic layer disposed between the first magnetic layer and the second magnetic layer;

[0198] A second non-magnetic layer disposed between the second magnetic layer and the third magnetic layer; and

[0199] A third non-magnetic layer disposed between the first magnetic pole and the first magnetic layer,

[0200] The third magnetic layer contains (Fe 100-x Co x ) 100-y E y (10 atm% ≤ x ≤ 50 atm%, 10 atm% ≤ y ≤ 90 atm%), the second element E includes at least one selected from Cr, V, Mn, Ti, and Sc,

[0201] The third magnetic layer is in contact with the second magnetic pole,

[0202] The first magnetic pole length of the first magnetic pole along the second direction is shorter than the second magnetic pole length of the second magnetic pole along the second direction. The second direction is perpendicular to the first direction from the first magnetic layer to the second magnetic layer and along the medium facing surface of the first magnetic pole.

[0203] The first magnetic layer length of the first magnetic layer along the third direction is longer than the second magnetic layer length of the second magnetic layer along the third direction. The third direction is perpendicular to the first direction.

[0204] (Technical solution 3)

[0205] The magnetic head according to technical solution 1 or 2.

[0206] The first magnetic layer contains at least one of Fe, Co, and Ni.

[0207] The second magnetic layer contains at least one of Fe, Co, and Ni.

[0208] (Technical solution 4)

[0209] The magnetic head according to any one of technical solutions 1 to 3.

[0210] The third direction intersects the second direction.

[0211] (Technical solution 5)

[0212] The magnetic head according to technical solution 4.

[0213] The first direction is inclined with respect to the medium facing surface.

[0214] (Technical solution 6)

[0215] The magnetic head according to any one of technical solutions 1 to 3.

[0216] The third direction is along the second direction.

[0217] (Technical solution 7)

[0218] A magnetic head includes:

[0219] A first magnetic pole;

[0220] A second magnetic pole; and

[0221] A laminate disposed between the first magnetic pole and the second magnetic pole.

[0222] The laminate includes:

[0223] A first magnetic layer;

[0224] A second magnetic layer, disposed between the first magnetic pole and the first magnetic layer;

[0225] A third magnetic layer, disposed between the first magnetic pole and the second magnetic layer;

[0226] A first non-magnetic layer, disposed between the second magnetic layer and the first magnetic layer;

[0227] A second non-magnetic layer, disposed between the third magnetic layer and the second magnetic layer;

[0228] A third non-magnetic layer, disposed between the first magnetic layer and the second magnetic pole; and

[0229] A fourth non-magnetic layer, disposed between the third magnetic layer and the second magnetic pole,

[0230] The fourth non-magnetic layer includes at least one selected from Cu, Au, Cr, Al, V, and Ag,

[0231] The third magnetic layer includes (Fe 100-x Co x ) 100-y E y (10 atm% ≤ x ≤ 50 atm%, 10 atm% ≤ y ≤ 90 atm%), the second element E includes at least one selected from Cr, V, Mn, Ti, and Sc,

[0232] The first magnetic pole length of the first magnetic pole along the second direction is shorter than the second magnetic pole length of the second magnetic pole along the second direction, the second direction is perpendicular to the first direction from the second magnetic layer to the first magnetic layer and along the medium opposite surface of the first magnetic pole,

[0233] The second magnetic layer length of the second magnetic layer along the third direction is longer than the first magnetic layer length of the first magnetic layer along the third direction, the third direction is perpendicular to the first direction.

[0234] (Technical solution 8)

[0235] A magnetic head, comprising:

[0236] A first magnetic pole;

[0237] A second magnetic pole; and

[0238] A laminate, disposed between the first magnetic pole and the second magnetic pole,

[0239] The laminate includes:

[0240] A first magnetic layer;

[0241] The second magnetic layer is disposed between the first magnetic pole and the first magnetic layer;

[0242] The third magnetic layer is disposed between the first magnetic pole and the second magnetic layer;

[0243] The first non-magnetic layer is disposed between the second magnetic layer and the first magnetic layer;

[0244] The second non-magnetic layer is disposed between the third magnetic layer and the second magnetic layer; and

[0245] The third non-magnetic layer is disposed between the first magnetic layer and the second magnetic pole,

[0246] The third magnetic layer contains (Fe 100-x Co x ) 100-y E y (10 atm% ≤ x ≤ 50 atm%, 10 atm% ≤ y ≤ 90 atm%), the second element E contains at least one selected from Cr, V, Mn, Ti, and Sc,

[0247] The third magnetic layer is in contact with the first magnetic pole,

[0248] The first magnetic pole length of the first magnetic pole along the second direction is shorter than the second magnetic pole length of the second magnetic pole along the second direction, and the second direction is perpendicular to the first direction from the second magnetic layer to the first magnetic layer and along the medium opposite surface of the first magnetic pole,

[0249] The second magnetic layer length of the second magnetic layer along the third direction is longer than the first magnetic layer length of the first magnetic layer along the third direction, and the third direction is perpendicular to the first direction.

[0250] (Technical solution 9)

[0251] The magnetic head according to technical solution 7 or 8,

[0252] The first magnetic layer contains at least one of Fe, Co, and Ni,

[0253] The second magnetic layer contains at least one of Fe, Co, and Ni.

[0254] (Technical solution 10)

[0255] The magnetic head according to any one of technical solutions 7 to 9,

[0256] The third direction intersects the second direction.

[0257] (Technical solution 11)

[0258] The magnetic head according to Technical Solution 10

[0259] The first direction is inclined with respect to the medium opposite surface.

[0260] (Technical Solution 12)

[0261] The magnetic head according to any one of Technical Solutions 7 to 9

[0262] The third direction is along the second direction.

[0263] (Technical Solution 13)

[0264] The magnetic head according to any one of Technical Solutions 1 to 12

[0265] The composition ratio x is 25 atm% or more and 35 atm% or less.

[0266] (Technical Solution 14)

[0267] The magnetic head according to Technical Solution 13

[0268] The composition ratio y is 10 atm% or more and 30 atm% or less.

[0269] (Technical Solution 15)

[0270] The magnetic head according to any one of Technical Solutions 1 to 14

[0271] The first non-magnetic layer contains at least one first element selected from Ru, Ir, Ta, and W

[0272] The thickness of the first non-magnetic layer along the first direction is 0.2 nm or more and 3 nm or less.

[0273] (Technical Solution 16)

[0274] The magnetic head according to any one of Technical Solutions 1 to 15

[0275] The first product of the first magnetic layer thickness of the first magnetic layer and the saturation magnetization of the first magnetic layer along the first direction is 0.8 times or more and 1.25 times or less of the second product of the second magnetic layer thickness of the second magnetic layer and the saturation magnetization of the second magnetic layer along the first direction.

[0276] (Technical Solution 17)

[0277] The magnetic head according to any one of Technical Solutions 1 to 15

[0278] The thickness of the third magnetic layer along the first direction is 0.7 times or less of the thickness of the first magnetic layer along the first direction and 0.7 times or less of the thickness of the second magnetic layer along the first direction.

[0279] (Technical solution 18)

[0280] The magnetic head according to Technical solution 17,

[0281] The thickness of the second magnetic layer is 0.8 times or more and 1.25 times or less of the thickness of the first magnetic layer.

[0282] (Technical solution 19)

[0283] The magnetic head according to any one of Technical solutions 1 to 17,

[0284] The second non-magnetic layer and the third non-magnetic layer contain at least one selected from Cu, Au, Cr, Al, V, and Ag.

[0285] (Technical solution 20)

[0286] A magnetic recording device includes:

[0287] The magnetic head according to any one of Technical solutions 1 to 19; and

[0288] A circuit,

[0289] The circuit can supply current to the laminate,

[0290] The current has a direction from the first magnetic layer to the second magnetic layer.

[0291] According to the embodiment, a magnetic head and a magnetic recording device capable of achieving an increase in recording density can be provided.

[0292] In the specification of this application, "vertical" and "parallel" are not only strictly vertical and strictly parallel. For example, including deviations in the manufacturing process, etc., as long as they are substantially vertical and substantially parallel.

[0293] As above, the embodiments of the present invention have been described with reference to specific examples. However, the present invention is not limited to these specific examples. For example, regarding the specific structures of each element such as magnetic poles, laminates, magnetic layers, non-magnetic layers, and wirings included in the magnetic head, as long as those skilled in the art can appropriately select from the known range and can implement the present invention in the same way and obtain the same effects, they are included in the scope of the present invention.

[0294] Technologies formed by combining any two or more elements of each specific example within the technically possible range are also included in the scope of the present invention as long as they include the gist of the present invention.

[0295] In addition, all the magnetic heads and magnetic recording devices that those skilled in the art can appropriately design and modify based on the magnetic heads and magnetic recording devices described above as embodiments of the present invention also belong to the scope of the present invention as long as they include the gist of the present invention.

[0296] 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 should be understood that these modification examples and correction examples also belong to the scope of the present invention.

[0297] Although some embodiments of the present invention have been described, 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 ways, and various omissions, substitutions, 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 included in the invention described in the claims and its equivalent scope.

Claims

1. A magnetic head, comprising: A first magnetic pole; A second magnetic pole; and A laminate disposed between the first magnetic pole and the second magnetic pole, The laminate includes: The first magnetic layer; The second magnetic layer, disposed between the first magnetic layer and the second magnetic pole; The third magnetic layer, disposed between the second magnetic layer and the second magnetic pole; The first non-magnetic layer, disposed between the first magnetic layer and the second magnetic layer; The second non-magnetic layer, disposed between the second magnetic layer and the third magnetic layer; The third non-magnetic layer, disposed between the first magnetic pole and the first magnetic layer; and The fourth non-magnetic layer, disposed between the third magnetic layer and the second magnetic pole, The fourth non-magnetic layer contains at least one selected from Cu, Au, Cr, Al, V, and Ag, The third magnetic layer contains (Fe 100-x Co x ), 100-y E y , the second element E includes at least one selected from Cr, V, Mn, Ti, and Sc, where 10 atm% ≤ x ≤ 50 atm%, 10 atm% ≤ y ≤ 90 atm%, the first magnetic layer and the second magnetic layer do not contain the second element E, or the concentration of the second element E in the first magnetic layer and the second magnetic layer is lower than the concentration of the second element E in the third magnetic layer. The first magnetic pole length of the first magnetic pole along the second direction is shorter than the second magnetic pole length of the second magnetic pole along the second direction, and the second direction is perpendicular to the first direction which is the direction from the first magnetic layer to the second magnetic layer and along the medium opposite surface of the first magnetic pole, The first magnetic layer length of the first magnetic layer along the third direction is longer than the second magnetic layer length of the second magnetic layer along the third direction, and the third direction is perpendicular to the first direction.

2. A magnetic head, comprising: A first magnetic pole; A second magnetic pole; and A laminate disposed between the first magnetic pole and the second magnetic pole, The laminate includes: The first magnetic layer; The second magnetic layer, disposed between the first magnetic layer and the second magnetic pole; The third magnetic layer, disposed between the second magnetic layer and the second magnetic pole; The first non-magnetic layer, disposed between the first magnetic layer and the second magnetic layer; The second non-magnetic layer, disposed between the second magnetic layer and the third magnetic layer; and The third non-magnetic layer, disposed between the first magnetic pole and the first magnetic layer, The third magnetic layer contains (Fe 100-x Co x ), 100-y E y , the second element E includes at least one selected from Cr, V, Mn, Ti, and Sc, where 10 atm% ≤ x ≤ 50 atm%, 10 atm% ≤ y ≤ 90 atm%, the first magnetic layer and the second magnetic layer do not contain the second element E, or the concentration of the second element E in the first magnetic layer and the second magnetic layer is lower than the concentration of the second element E in the third magnetic layer. The third magnetic layer is in contact with the second magnetic pole, The first magnetic pole length of the first magnetic pole along the second direction is shorter than the second magnetic pole length of the second magnetic pole along the second direction, and the second direction is perpendicular to the first direction which is the direction from the first magnetic layer to the second magnetic layer and along the medium opposite surface of the first magnetic pole, The first magnetic layer length of the first magnetic layer along the third direction is longer than the second magnetic layer length of the second magnetic layer along the third direction, and the third direction is perpendicular to the first direction.

3. The magnetic head according to claim 1, The third direction intersects the second direction.

4. The magnetic head according to claim 1, The third direction is along the second direction.

5. A magnetic head, comprising: A first magnetic pole; A second magnetic pole; and A laminate disposed between the first magnetic pole and the second magnetic pole, The laminate includes: The first magnetic layer; The second magnetic layer, disposed between the first magnetic pole and the first magnetic layer; The third magnetic layer, disposed between the first magnetic pole and the second magnetic layer; The first non-magnetic layer, disposed between the second magnetic layer and the first magnetic layer; The second non-magnetic layer, disposed between the third magnetic layer and the second magnetic layer; The third non-magnetic layer, disposed between the first magnetic layer and the second magnetic pole; And The fourth non-magnetic layer, disposed between the third magnetic layer and the first magnetic pole, The fourth non-magnetic layer contains at least one selected from Cu, Au, Cr, Al, V, and Ag, The third magnetic layer contains (Fe 100-x Co x ), 100-y E y , the second element E includes at least one selected from Cr, V, Mn, Ti, and Sc, where 10 atm% ≤ x ≤ 50 atm%, 10 atm% ≤ y ≤ 90 atm%, the first magnetic layer and the second magnetic layer do not contain the second element E, or the concentration of the second element E in the first magnetic layer and the second magnetic layer is lower than the concentration of the second element E in the third magnetic layer. The first magnetic pole length of the first magnetic pole along the second direction is shorter than the second magnetic pole length of the second magnetic pole along the second direction, and the second direction is perpendicular to the first direction which is the direction from the second magnetic layer to the first magnetic layer and along the medium opposite surface of the first magnetic pole, The second magnetic layer length of the second magnetic layer along the third direction is longer than the first magnetic layer length of the first magnetic layer along the third direction, and the third direction is perpendicular to the first direction.

6. A magnetic head, comprising: A first magnetic pole; A second magnetic pole; and A laminate disposed between the first magnetic pole and the second magnetic pole, The laminate includes: The first magnetic layer; The second magnetic layer, disposed between the first magnetic pole and the first magnetic layer; The third magnetic layer, disposed between the first magnetic pole and the second magnetic layer; The first non-magnetic layer, disposed between the second magnetic layer and the first magnetic layer; The second non-magnetic layer, disposed between the third magnetic layer and the second magnetic layer; and The third non-magnetic layer, disposed between the first magnetic layer and the second magnetic pole, The third magnetic layer contains (Fe 100-x Co x ), 100-y E y , the second element E includes at least one selected from Cr, V, Mn, Ti, and Sc, where 10 atm% ≤ x ≤ 50 atm%, 10 atm% ≤ y ≤ 90 atm%, the first magnetic layer and the second magnetic layer do not contain the second element E, or the concentration of the second element E in the first magnetic layer and the second magnetic layer is lower than the concentration of the second element E in the third magnetic layer. The third magnetic layer is in contact with the first magnetic pole, The first magnetic pole length of the first magnetic pole along the second direction is shorter than the second magnetic pole length of the second magnetic pole along the second direction, and the second direction is perpendicular to the first direction which is the direction from the second magnetic layer to the first magnetic layer and along the medium opposite surface of the first magnetic pole, The second magnetic layer length of the second magnetic layer along the third direction is longer than the first magnetic layer length of the first magnetic layer along the third direction, and the third direction is perpendicular to the first direction.

7. The magnetic head according to claim 6, The third direction intersects the second direction.

8. The magnetic head according to claim 6, The third direction is along the second direction.

9. The magnetic head according to claim 1, 25 atm% ≤ x ≤ 35 atm%.

10. A magnetic recording device, comprising: The magnetic head according to claim 1; and A circuit, The circuit is capable of supplying current to the laminate, The current has a direction from the first magnetic layer to the second magnetic layer.

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