Magnetic device, magnetic head, and magnetic recording device

Abstract

To provide a magnetic device, a magnetic head, and a magnetic recording device capable of improving characteristics.SOLUTION: According to the embodiment, a magnetic device includes a magnetic element including a first magnetic layer and a second magnetic layer, and a magnetic field generating unit. The magnetic field generating unit can perform a first transition operation and a second transition operation. In the first transition operation, a first state in which a first magnetic field is generated transits to a second state in which a second magnetic field is generated. In the second transition operation, the second state transits to the first state. The first magnetic field includes a first component in a first direction from the first magnetic layer to the second magnetic layer. The second magnetic field includes a second component in a second direction from the second magnetic layer to the first magnetic layer.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] FIELD Embodiments of the present invention relate to a magnetic device, a magnetic head, and a magnetic recording apparatus. [Background technology]

[0002] 2. Description of the Related Art By using a magnetic head including a magnetic device, information is recorded on a magnetic recording medium such as an HDD (Hard Disk Drive). Improvements in the characteristics of magnetic devices, magnetic heads, and magnetic recording apparatuses are desired. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2022-129730 A Summary of the Invention [Problem to be solved by the invention]

[0004] SUMMARY OF THE PREFERRED EMBODIMENTS An embodiment of the present invention provides a magnetic device, a magnetic head, and a magnetic recording apparatus capable of improving characteristics. [Means for solving the problem]

[0005] According to an embodiment, a magnetic device includes a magnetic element including a first magnetic layer and a second magnetic layer, and a magnetic field generating unit. The magnetic field generating unit is capable of performing a first transition operation and a second transition operation. In the first transition operation, a transition is made from a first state in which a first magnetic field is generated to a second state in which a second magnetic field is generated. In the second transition operation, a transition is made from the second state to the first state. The first magnetic field includes a first component in a first direction from the first magnetic layer to the second magnetic layer. The second magnetic field includes a second component in a second direction from the second magnetic layer to the first magnetic layer. [Brief description of the drawings]

[0006] [Figure 1]FIG. 1 is a schematic cross-sectional view illustrating the magnetic device according to the first embodiment. [Diagram 2] 2(a) to 2(c) are schematic views illustrating the operation of the magnetic device according to the first embodiment. [Diagram 3] FIG. 3 is a schematic perspective view illustrating the magnetic recording device according to the second embodiment. [Figure 4] FIG. 4 is a schematic perspective view illustrating a part of the magnetic recording device according to the second embodiment. [Diagram 5] FIG. 5 is a schematic perspective view illustrating the magnetic recording device according to the embodiment. [Figure 6] 6A and 6B are schematic perspective views illustrating a part of the magnetic recording device according to the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0007] (First embodiment) FIG. 1 is a schematic cross-sectional view illustrating the magnetic device according to the first embodiment. As shown in FIG. 1, a magnetic device 101 according to the embodiment includes a magnetic element 20 and a magnetic field generating unit 30.

[0008] The magnetic element 20 includes a first magnetic layer 21 and a second magnetic layer 22. In this example, the magnetic element 20 further includes a first intermediate layer 41. The first intermediate layer 41 is provided between the first magnetic layer 21 and the second magnetic layer 22. The first intermediate layer 41 is, for example, conductive. The first intermediate layer 41 is non-magnetic. An element current ic can flow through the magnetic element 20. The element current ic flows along the stacking direction in the magnetic element 20.

[0009] A first direction D1 from the first magnetic layer 21 to the second magnetic layer 22 is defined as the X-axis direction. A direction perpendicular to the X-axis direction is defined as the Z-axis direction. A direction perpendicular to the X-axis direction and the Z-axis direction is defined as the Y-axis direction. The stacking direction is along the first direction D1.

[0010] The magnetic field generating unit 30 can perform a first transition operation and a second transition operation, which will be described later. In these operations, a magnetic field Hx is generated from the magnetic field generating unit 30. In one example, the magnetic field generating unit 30 may include an electromagnet. For example, the magnetic field generating unit 30 includes a first magnetic pole 31 and a coil 30c. For example, a recording current Iw flows through the coil 30c. A magnetic field Hx corresponding to the recording current Iw is generated from the first magnetic pole 31. The magnetic field Hx is applied to the magnetic element 20.

[0011] 2(a) to 2(c) are schematic views illustrating the operation of the magnetic device according to the first embodiment. The horizontal axis in these figures represents time tm. The vertical axis in Fig. 2(a) corresponds to the magnetic field Hx generated by the magnetic field generating unit 30. The vertical axis in Fig. 2(b) corresponds to the direction of the first magnetization M1 of the first magnetic layer 21. The vertical axis in Fig. 2(c) corresponds to the direction of the second magnetization M2 of the second magnetic layer 22.

[0012] As shown in FIG. 2(a), the magnetic field generating unit 30 can perform a first transition operation TO1 and a second transition operation TO2. In the first transition operation TO1, a transition is made from the first state ST1 to the second state ST2. In the second transition operation TO2, a transition is made from the second state ST2 to the first state ST1. In the first state ST1, a first magnetic field Hx1 is generated. In the second state ST2, a second magnetic field Hx2 is generated.

[0013] 1, the first magnetic field Hx1 includes a first component in a first direction from the first magnetic layer 21 to the second magnetic layer 22. The second magnetic field Hx2 includes a second component in a second direction from the second magnetic layer 22 to the first magnetic layer 21. The second direction is opposite to the first direction.

[0014] The first transition operation TO1 and the second transition operation TO2 change the direction of the magnetic field MF emitted from the magnetic element 20. For example, when the magnetic field MF is applied to the magnetic recording medium 80, the direction of magnetization of the magnetic recording medium 80 can be changed. This makes it possible to record information on the magnetic recording medium 80. For example, the magnetic device 101 can be applied to a magnetic head 110. Information can be recorded on the magnetic recording medium 80 by the magnetic head 110 including the above-mentioned magnetic device 101.

[0015] For example, in the above operation, an element current i c flows through the magnetic element 20. The direction of the magnetic field MF emitted from the magnetic element 20 changes due to the spin of these magnetic layers based on the element current i c and the change in the direction of the magnetic field Hx generated by the magnetic field generating unit 30.

[0016] For example, the first magnetic layer 21 is provided between the magnetic field generation unit 30 and the second magnetic layer 22. In the embodiment, the second magnetic layer 22 may be provided between the magnetic field generation unit 30 and the first magnetic layer 21.

[0017] For example, one of the first magnetic layer 21 and the second magnetic layer 22 has a positive polarization, and the other of the first magnetic layer 21 and the second magnetic layer 22 has a negative polarization.

[0018] In one example, the first magnetic layer 21 includes a first element including at least one selected from the group consisting of Fe, Co, and Ni. The second magnetic layer 22 includes the first element and a second element. The second element includes at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc. The first magnetic layer 21 does not include the second element. Alternatively, the first concentration of the second element in the first magnetic layer 21 is lower than the second concentration of the second element in the second magnetic layer 22. With this configuration, the first magnetic layer 21 tends to have a positive polarization, and the second magnetic layer 22 tends to have a negative polarization.

[0019] When the first magnetic layer 21 has a positive polarization and the second magnetic layer 22 has a negative polarization, the element current i c may be oriented from the first magnetic layer 21 to the second magnetic layer 22. When the second magnetic layer 22 has a positive polarization and the first magnetic layer 21 has a negative polarization, the element current i c may be oriented from the second magnetic layer 22 to the first magnetic layer 21.

[0020] The change component (AC component) of the magnetic field MF generated by the magnetic element 20 corresponds to the time change of the first magnetization M1 and the second magnetization M2 illustrated in Figures 2(b) and 2(c). The oscillation frequency of the magnetic field MF corresponds to the oscillation frequency of the first magnetization M1 and the second magnetization M2.

[0021] For example, in the first state ST1, an element current ic flows through the magnetic element 20. In the first state ST1, a first magnetic field Hx1 generated from the magnetic field generating unit 30 is applied to the magnetic element 20. In the first state ST1, the frequency of the magnetic field MF generated from the magnetic element 20 is set to a first oscillation frequency f1. For example, the first oscillation frequency f1 is 10 GHz or less.

[0022] For example, in the second state ST2, an element current ic flows through the magnetic element 20. In the second state ST2, a second magnetic field Hx2 generated from the magnetic field generating unit 30 is applied to the magnetic element 20. In the second state ST2, the frequency of the magnetic field MF generated from the magnetic element 20 is set to a second oscillation frequency f2. For example, the second oscillation frequency f2 is 10 GHz or less.

[0023] In the first transition operation TO1, while the element current ic flows through the magnetic element 20, the magnetic field Hx generated from the magnetic field generating unit 30 changes from the first magnetic field Hx1 to the second magnetic field Hx2. The oscillation frequency of the magnetic field MF generated from the magnetic element 20 in the first transition operation TO1 is set as a first transition operation oscillation frequency ft1. The first transition operation oscillation frequency ft1 is higher than the first oscillation frequency f1 and higher than the second oscillation frequency f2.

[0024] In the second transition operation TO2, while the element current ic flows through the magnetic element 20, the magnetic field Hx generated from the magnetic field generating unit 30 changes from the second magnetic field Hx2 to the first magnetic field Hx1. The oscillation frequency of the magnetic field MF generated from the magnetic element 20 in the second transition operation TO2 is set as the second transition operation oscillation frequency ft2. The second transition operation oscillation frequency ft2 is higher than the first oscillation frequency f1 and higher than the second oscillation frequency f2.

[0025] The direction of the magnetic field MF is switched by the first transition operation TO1 and the second transition operation TO2 having such a high oscillation frequency. This makes it possible to change, for example, the magnetization of the magnetic recording medium 80. Target information can be recorded on the magnetic recording medium 80.

[0026] The first oscillation frequency f1 may be, for example, 1 / 3 or less of the resonance frequency of the magnetic recording medium 80. The second oscillation frequency f2 may be, for example, 1 / 3 or less of the resonance frequency of the magnetic recording medium 80.

[0027] In the first reference example, a high-frequency magnetic field generated from the magnetic element 20 is applied to the magnetic recording medium 80 while a recording magnetic field generated from the magnetic pole is applied to the magnetic recording medium 80. The high-frequency magnetic field makes the magnetization of the magnetic recording medium 80 more easily changeable, and the magnetization of the magnetic recording medium 80 is controlled to a direction according to the recording magnetic field. In the first reference example, for example, MAMR (Microwave Assisted Magnetic Recording) is implemented. In the first reference example, the frequency of the magnetic field MF generated from the magnetic element 20 is constant.

[0028] In contrast, in the embodiment, the frequency of the magnetic field MF emitted from the magnetic element 20 changes during the transition operation. The magnetization of the magnetic recording medium 80 can be stably changed. For example, a high recording density can be obtained. According to the embodiment, it is possible to provide a magnetic device, a magnetic head, and a magnetic recording apparatus that can improve the characteristics.

[0029] In the embodiment, the first magnetic layer 21 and the second magnetic layer 22 preferably have negative perpendicular magnetic anisotropy, which makes it easier to achieve the desired change in the magnetic field MF.

[0030] The thickness t1 of the first magnetic layer 21 (see FIG. 1) may be, for example, 5 nm or more and 15 nm or less. The thickness t2 of the second magnetic layer 22 (see FIG. 1) may be, for example, 5 nm or more and 15 nm or less. Stable operation is easily obtained. These thicknesses are lengths along the first direction D1.

[0031] The distance d1 (see FIG. 1) between the first magnetic layer 21 and the second magnetic layer 22 may be 2 nm or more and 10 nm or less. Stable operation is easily obtained. The distance d1 is the length along the first direction D1.

[0032] The first intermediate layer 41 may be in contact with the first magnetic layer 21 and the second magnetic layer 22. The distance d1 corresponds to the thickness of the first intermediate layer 41, for example.

[0033] The first intermediate layer 41 includes, for example, at least one selected from the group consisting of Cu, Al, Au, Ag, and Cr.

[0034] As described above, the first transition operation TO1 and the second transition operation TO2 are performed in response to the write current Iw flowing through the coil 30c. For example, the first transition operation TO1 and the second transition operation TO2 are performed by changing the direction of the write current Iw.

[0035] The magnetic head 110 according to the embodiment includes the magnetic device 101 according to the embodiment.

[0036] Second embodiment As shown in FIG. 1, a magnetic recording device 210 according to the embodiment includes a magnetic head 110 and a magnetic recording medium 80. First information is recorded on the magnetic recording medium 80 by a first transition operation TO1. Second information is recorded on the magnetic recording medium 80 by a second transition operation TO2. The second information is different from the first information. The first information is, for example, one of "0" and "1". The second information is one of "0" and "1".

[0037] The magnetic recording device 210 may further include an element circuit 20D. The element circuit 20D can supply an element current i c to the first magnetic layer 21 and the second magnetic layer 22 in the first transition operation TO1 and the second transition operation TO2. The element circuit 20D can supply an element current i c to the first magnetic layer 21 and the second magnetic layer 22 in the first state ST1 and the second state ST2.

[0038] In one example of the magnetic recording device 210, the first magnetic layer 21 includes a first element including at least one selected from the group consisting of Fe, Co, and Ni. The second magnetic layer 22 includes the first element and a second element. The second element includes at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc. The first magnetic layer 21 does not include the second element. Or, the first concentration of the second element in the first magnetic layer 21 is lower than the second concentration of the second element in the second magnetic layer 22. In this case, the element current ic flows from the first magnetic layer 21 to the second magnetic layer 22.

[0039] In the magnetic recording device 210, in the first state ST1, the first oscillation frequency f1 of the magnetic field MF generated from the magnetic element 20 is 10 GHz or less. In the second state ST2, the second oscillation frequency f2 of the magnetic field MF generated from the magnetic element 20 is 10 GHz or less.

[0040] In the magnetic recording device 210, a first transition operation oscillation frequency ft1 of the magnetic field MF generated from the magnetic element 20 in the first transition operation TO1 is higher than the first oscillation frequency f1 and higher than the second oscillation frequency f2. A second transition operation oscillation frequency ft2 of the magnetic field MF generated from the magnetic element 20 in the second transition operation TO2 is higher than the first oscillation frequency f1 and higher than the second oscillation frequency f2.

[0041] In the magnetic recording device 210, the first oscillation frequency f1 may be equal to or less than 1 / 3 of the resonance frequency of the magnetic recording medium 80. The second oscillation frequency f2 may be equal to or less than 1 / 3 of the resonance frequency. The resonance frequency is, for example, 20 GHz or more and 100 GHz or less.

[0042] The magnetic recording device 210 may further include a recording circuit 30D. The magnetic field generating unit 30 includes, for example, a first magnetic pole 31 and a coil 30c. The recording circuit 30D can supply a recording current Iw to the coil 30c. A first transition operation TO1 and a second transition operation TO2 are performed in response to the recording current Iw.

[0043] FIG. 3 is a schematic perspective view illustrating the magnetic recording device according to the second embodiment. 3, in a magnetic recording device 210 according to the embodiment, a magnetic head 110 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. The recording section 60 includes a magnetic device 101.

[0044] The recording section 60 of the magnetic head 110 records information on the magnetic recording medium 80. The reproducing section 70 reproduces the information recorded on the magnetic recording medium 80.

[0045] 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 60.

[0046] The reproducing unit 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.

[0047] 3, the magnetic recording medium 80 moves relative to the magnetic head 110 in a medium movement direction 85. The magnetic head 110 controls information corresponding to the magnetization 83 of the magnetic recording layer 81 at an arbitrary position. The magnetic head 110 reproduces information corresponding to the magnetization 83 of the magnetic recording layer 81 at an arbitrary position.

[0048] The recording unit 60 (or the magnetic device 101) may further include a second magnetic pole 32. The magnetic element 20 is provided between the first magnetic pole 31 and the second magnetic pole 32. By providing the second magnetic pole 32, the magnetic field Hx (see FIG. 1 ) generated from the magnetic field generating unit 30 is effectively applied to the magnetic element 20. The second magnetic pole 32 may be included in the magnetic field generating unit 30.

[0049] FIG. 4 is a schematic perspective view illustrating a part of the magnetic recording device according to the second embodiment. FIG. 4 illustrates a head slider. The magnetic head 110 is provided on a head slider 159. The head slider 159 includes, for example, Al2O3 / TiC, etc. The head slider 159 moves relative to the magnetic recording medium while floating above or in contact with the magnetic recording medium.

[0050] 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. This allows the magnetic head 110 to move relative to the magnetic recording medium while floating above or in contact with the magnetic recording medium.

[0051] FIG. 5 is a schematic perspective view illustrating the magnetic recording device according to the embodiment. 6A and 6B are schematic perspective views illustrating a part of the magnetic recording device according to the embodiment. As shown in FIG. 5, a rotary actuator is used in the magnetic recording device 150 according to the embodiment. The recording medium disk 180 is mounted on a spindle motor 180M. The recording medium disk 180 is rotated in the direction of the arrow AR by the spindle motor 180M. The spindle motor 180M responds to a control signal from a drive control unit. The magnetic recording device 150 according to the embodiment may include a plurality of recording medium disks 180. The magnetic recording device 150 may include a recording medium 181. The recording medium 181 is, for example, a solid state drive (SSD). For example, a non-volatile memory such as a flash memory is used for the recording medium 181. For example, the magnetic recording device 150 may be a hybrid hard disk drive (HDD).

[0052] 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. Near the tip of the head slider 159, a magnetic head according to the embodiment is provided.

[0053] When the recording medium disk 180 rotates, the pressing pressure by the suspension 154 and the pressure generated at 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 is a predetermined flying height. 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.

[0054] The suspension 154 is connected to one end of an arm 155 (e.g., an actuator arm). The arm 155 has, for example, a bobbin portion. 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 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.

[0055] Arm 155 is held by a ball bearing. The ball bearings are provided at two locations, above and below bearing portion 157. Arm 155 can rotate and slide by voice coil motor 156. The magnetic head can be moved to any position on recording medium disk 180.

[0056] FIG. 6A illustrates a partial configuration of the magnetic recording device, and is an enlarged perspective view of a head stack assembly 160. FIG. FIG. 6B is a perspective view illustrating a magnetic head assembly (head gimbal assembly: HGA) 158 which is a part of the head stack assembly 160.

[0057] 6(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 extension direction of the support frame 161 is opposite to the extension direction of the head gimbal assembly 158. The support frame 161 supports a coil 162 of the voice coil motor 156.

[0058] As shown in FIG. 6( b ), the head gimbal assembly 158 has an arm 155 extending from a bearing portion 157 , and a suspension 154 extending from the arm 155 .

[0059] A head slider 159 is provided at the tip of the suspension 154. The head slider 159 is provided with a magnetic head according to the embodiment.

[0060] A magnetic head assembly (head gimbal assembly) 158 according to the embodiment includes a 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.

[0061] The suspension 154 has, for example, lead wires (not shown) for recording and reproducing signals. The suspension 154 may have, for example, lead wires (not shown) for a heater for adjusting the flying height. The suspension 154 may have, for example, lead wires (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.

[0062] A signal processing unit 190 is provided in the magnetic recording device 150. The signal processing unit 190 records and reproduces signals on the magnetic recording medium using a magnetic head. The input / output lines of the signal processing unit 190 are connected to, for example, electrode pads of the head gimbal assembly 158, and are electrically connected to the magnetic head.

[0063] The magnetic recording device 150 according to the embodiment includes a magnetic recording medium, a magnetic head according to the embodiment, a movable unit, a position control unit, and a signal processing unit. The movable unit allows the magnetic recording medium and the magnetic head to be relatively moved while being separated from each other or in contact with each other. The position control unit aligns the magnetic head with a predetermined recording position on the magnetic recording medium. The signal processing unit records and reproduces signals on the magnetic recording medium using the magnetic head.

[0064] For example, the magnetic recording medium is a recording medium disk 180. The movable portion includes, for example, a head slider 159. The position control portion includes, for example, a head gimbal assembly 158.

[0065] The embodiments may include the following technical solutions. (Technical proposal 1) a magnetic element including a first magnetic layer and a second magnetic layer; A magnetic field generating unit; Equipped with The magnetic field generating unit is capable of performing a first transition operation and a second transition operation, In the first transition operation, a transition is made from a first state in which a first magnetic field is generated to a second state in which a second magnetic field is generated; In the second transition operation, the second state is transitioned to the first state, the first magnetic field includes a first component in a first direction from the first magnetic layer to the second magnetic layer; The second magnetic field includes a second component in a second direction from the second magnetic layer to the first magnetic layer.

[0066] (Technical proposal 2) one of the first magnetic layer and the second magnetic layer has a positive polarization; The magnetic device described in Technical Solution 1, wherein the other of the first magnetic layer and the second magnetic layer has a negative polarization.

[0067] (Technical proposal 3) the first magnetic layer includes a first element including at least one selected from the group consisting of Fe, Co, and Ni; the second magnetic layer includes the first element and a second element, the second element including at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc; A magnetic device as described in Technical Proposal 1, wherein the first magnetic layer does not contain the second element, or a first concentration of the second element in the first magnetic layer is lower than a second concentration of the second element in the second magnetic layer.

[0068] (Technical proposal 4) In the first state and the second state, a device current flows in a direction from the first magnetic layer to the second magnetic layer, In the first state, a first oscillation frequency of the magnetic field generated by the magnetic element is 10 GHz or less; A magnetic device as described in Technical Proposal 3, wherein in the second state, a second oscillation frequency of the magnetic field generated from the magnetic element is 10 GHz or less.

[0069] (Technical proposal 5) A first transition operation oscillation frequency of the magnetic field generated from the magnetic element in the first transition operation is higher than the first oscillation frequency and higher than the second oscillation frequency; The magnetic device described in Technical Solution 4, wherein a second transition operation oscillation frequency of the magnetic field generated from the magnetic element in the second transition operation is higher than the first oscillation frequency and higher than the second oscillation frequency.

[0070] (Technical proposal 6) The magnetic device according to any one of Technical Solutions 1 to 5, wherein the first magnetic layer and the second magnetic layer have negative perpendicular magnetic anisotropy.

[0071] (Technical proposal 7) The first magnetic layer is provided between the magnetic field generating unit and the second magnetic layer, or The magnetic device according to any one of Technical Solutions 1 to 5, wherein the second magnetic layer is provided between the magnetic field generating unit and the first magnetic layer.

[0072] (Technical proposal 8) The magnetic device according to any one of Technical Solutions 1 to 7, wherein the magnetic element further includes a first intermediate layer provided between the first magnetic layer and the second magnetic layer.

[0073] (Technical proposal 9) The magnetic device described in Technical Solution 8, wherein the first intermediate layer is conductive and non-magnetic.

[0074] (Technical proposal 10) The magnetic device according to Technical Solution 8 or 9, wherein the first intermediate layer contains at least one selected from the group consisting of Cu, Al, Au, Ag, and Cr.

[0075] (Technical proposal 11) The magnetic device according to any one of Technical Solutions 1 to 10, wherein the distance between the first magnetic layer and the second magnetic layer is not less than 2 nm and not more than 10 nm.

[0076] (Technical proposal 12) The magnetic field generating unit includes: A first magnetic pole; A coil and Including, The magnetic device according to any one of Technical Schemes 1 to 11, wherein the first transition operation and the second transition operation are performed in response to a write current flowing through the coil.

[0077] (Technical proposal 13) A magnetic head equipped with the magnetic device described in Technical Proposal 1.

[0078] (Technical proposal 14) A magnetic head according to Technical Proposal 13; A magnetic recording medium; A magnetic recording device comprising:

[0079] (Technical proposal 15) the first transition operation records first information on the magnetic recording medium; The magnetic recording device described in Technical Proposal 14, wherein the second transition operation records second information different from the first information on the magnetic recording medium.

[0080] (Technical proposal 16) Further comprising an element circuit, the element circuit is capable of supplying an element current to the first magnetic layer and the second magnetic layer in the first transition operation and the second transition operation; the first magnetic layer includes a first element including at least one selected from the group consisting of Fe, Co, and Ni; the second magnetic layer includes the first element and a second element, the second element including at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc; the first magnetic layer does not contain the second element, or a first concentration of the second element in the first magnetic layer is lower than a second concentration of the second element in the second magnetic layer; The magnetic recording device described in Technical Proposal 15, wherein the element current flows from the first magnetic layer to the second magnetic layer.

[0081] (Technical proposal 17) In the first state, a first oscillation frequency of the magnetic field generated by the magnetic element is 10 GHz or less; The magnetic recording device according to Technical Proposal 16, wherein in the second state, a second oscillation frequency of the magnetic field generated from the element current is 10 GHz or less.

[0082] (Technical proposal 18) A first transition operation oscillation frequency of the magnetic field generated from the magnetic element in the first transition operation is higher than the first oscillation frequency and higher than the second oscillation frequency; The magnetic recording device according to Technical Solution 17, wherein a second transition operation oscillation frequency of the magnetic field generated from the magnetic element in the second transition operation is higher than the first oscillation frequency and higher than the second oscillation frequency.

[0083] (Technical proposal 19) the first oscillation frequency is equal to or less than 1 / 3 of a resonance frequency of the magnetic recording medium, The magnetic recording device according to Technical Solution 17 or 18, wherein the second oscillation frequency is 1 / 3 or less of the resonant frequency.

[0084] (Technical proposal 20) Further comprising a recording circuit; The magnetic field generating unit includes: A first magnetic pole; A coil and Including, the recording circuit is capable of supplying a recording current to the coil; 20. The magnetic recording device according to any one of Technical Solutions 16 to 19, wherein the first transition operation and the second transition operation are performed in response to the recording current.

[0085] According to the embodiments, it is possible to provide a magnetic device, a magnetic head, and a magnetic recording apparatus that can improve characteristics.

[0086] In this specification, "vertical" and "parallel" do not only mean strictly vertical and strictly parallel, but also include, for example, variations in the manufacturing process, and may mean substantially vertical and substantially parallel.

[0087] The above describes the embodiments of the present invention with reference to specific examples. However, the present invention is not limited to these specific examples. For example, the specific configurations of each element, such as the magnetic pole, magnetic element, magnetic layer, and control unit, included in the magnetic device, magnetic head, and magnetic recording device, are included in the scope of the present invention as long as a person skilled in the art can implement the present invention in the same way and obtain the same effect by appropriately selecting from the known range.

[0088] Any combination of two or more elements of each embodiment, within the scope of technical feasibility, is also included within the scope of the present invention as long as it includes the gist of the present invention.

[0089] In addition, all magnetic devices, magnetic heads, and magnetic recording devices that can be implemented by a person skilled in the art by making appropriate design modifications based on the magnetic devices, magnetic heads, and magnetic recording devices described above as embodiments of the present invention also fall within the scope of the present invention as long as they include the gist of the present invention.

[0090] In addition, within the scope of the concept of the present invention, a person skilled in the art may conceive of various modifications and alterations, and it will be understood that these modifications and alterations also fall within the scope of the present invention.

[0091] 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 forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, and are included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0092] 20: magnetic element, 20D: element circuit, 21, 22: first and second magnetic layers, 30: magnetic field generating section, 30D: recording circuit, 30c: coil, 31, 32: first and second magnetic poles, 41: first intermediate layer, 60: recording section, 70: reproducing section, 71: magnetic reproducing element, 72a, 72b: first and second reproducing magnetic shields, 80: magnetic recording medium, 81: magnetic recording layer, 82: medium substrate, 83: magnetization, 85: medium movement direction, 101: magnetic device, 110: magnetic head, 150: magnetic recording device, 154: suspension, 155: arm, 156: voice coil motor, 157: bearing section, 158: head gimbal assembly, 159: head slider, 159A: air inlet 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, 210: magnetic recording device, AR: arrow, D1: first direction, Hx: magnetic field, Hx1, Hx2: first and second magnetic fields, Iw: recording current, M1, M2: first and second magnetizations, MF: magnetic field, ST1, ST2: first and second states, TO1, TO2: first and second transition operations, d1: distance, f1, f2: first and second oscillation frequencies, ft1, ft2: first and second transition operation oscillation frequencies, ic: element current, t1, t2: first and second thicknesses, tm: time

Claims

1. a magnetic element including a first magnetic layer and a second magnetic layer; A magnetic field generating unit; Equipped with The magnetic field generating unit is capable of performing a first transition operation and a second transition operation, In the first transition operation, a transition is made from a first state in which a first magnetic field is generated to a second state in which a second magnetic field is generated; In the second transition operation, the second state is transitioned to the first state, the first magnetic field includes a first component in a first orientation from the first magnetic layer to the second magnetic layer; The second magnetic field includes a second component in a second direction from the second magnetic layer to the first magnetic layer.

2. the first magnetic layer includes a first element including at least one selected from the group consisting of Fe, Co, and Ni; the second magnetic layer includes the first element and a second element, the second element including at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc; The magnetic device of claim 1 , wherein the first magnetic layer does not contain the second element, or a first concentration of the second element in the first magnetic layer is lower than a second concentration of the second element in the second magnetic layer.

3. In the first state and the second state, a device current flows in a direction from the first magnetic layer to the second magnetic layer, In the first state, a first oscillation frequency of the magnetic field generated by the magnetic element is 10 GHz or less; The magnetic device according to claim 2 , wherein in the second state, a second oscillation frequency of the magnetic field generated from the magnetic element is equal to or lower than 10 GHz.

4. a first transition operation oscillation frequency of the magnetic field generated from the magnetic element in the first transition operation is higher than the first oscillation frequency and higher than the second oscillation frequency; The magnetic device according to claim 3 , wherein a second transition operation oscillation frequency of the magnetic field generated from the magnetic element in the second transition operation is higher than the first oscillation frequency and higher than the second oscillation frequency.

5. 5. The magnetic device according to claim 1, wherein the first magnetic layer and the second magnetic layer have negative perpendicular magnetic anisotropy.

6. A magnetic head comprising the magnetic device according to claim 1.

7. A magnetic head according to claim 6; A magnetic recording medium; A magnetic recording device comprising:

8. the first transition operation records first information on the magnetic recording medium; 8. The magnetic recording device according to claim 7, wherein second information different from the first information is recorded on the magnetic recording medium by the second transition operation.

9. Further comprising an element circuit, the element circuit is capable of supplying an element current to the first magnetic layer and the second magnetic layer in the first transition operation and the second transition operation; the first magnetic layer includes a first element including at least one selected from the group consisting of Fe, Co, and Ni; the second magnetic layer includes the first element and a second element, the second element including at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc; the first magnetic layer does not contain the second element, or a first concentration of the second element in the first magnetic layer is lower than a second concentration of the second element in the second magnetic layer; The magnetic recording device according to claim 8 , wherein the element current flows from the first magnetic layer to the second magnetic layer.

10. Further comprising a recording circuit; The magnetic field generating unit includes: A first magnetic pole; A coil and Including, the recording circuit is capable of supplying a recording current to the coil; The magnetic recording apparatus according to claim 9 , wherein the first transition operation and the second transition operation are performed in response to the recording current.

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