Magnetic recording device

Abstract

Provided is a magnetic recording device capable of achieving an increase in recording density. According to an embodiment, the magnetic recording device includes a magnetic head and a control section. The magnetic head includes a first magnetic pole, a magnetic element, and a coil, and the magnetic element includes a magnetic layer. The control section is electrically connected to the magnetic element and the coil. The control section is capable of supplying a recording current to the coil and an element current to the magnetic element. The recording current includes a first period of a first polarity, a second period of a second polarity different from the first polarity, a third period of transition from the first period to the second period, and a fourth period of transition from the second period to the first period. The element current includes a direct current component and an alternating current component. The alternating current component in the first period is the same as the alternating current component in the second period, the alternating current component in the third period, and the alternating current component in the fourth period.

Description

[0001] This application is based on Japanese Patent Application No. 2021-128975 (Filing Date: August 5, 2021) and claims priority benefit of this application. This application incorporates the content of the application by reference. TECHNICAL FIELD

[0002] Embodiments of the present application relate to a magnetic recording device. BACKGROUND

[0003] A magnetic head is used to record information to a magnetic recording medium such as a hard disk drive (HDD). In a magnetic recording device, an increase in recording density is desired. SUMMARY

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

[0005] Means for solving the problem

[0006] According to an embodiment, a magnetic recording device includes a magnetic head and a control section. The magnetic head includes a first magnetic pole, a magnetic element, and a coil. The magnetic element includes a first magnetic layer. The control section is electrically connected to the magnetic element and the coil. The control section is capable of supplying a recording current to the coil and an element current to the magnetic element. The recording current includes a first period of a first polarity, a second period of a second polarity different from the first polarity, a third period that transitions from the first period to the second period, and a fourth period that transitions from the second period to the first period. The element current includes a direct current component and an alternating current component. The alternating current component in the first period is the same as the alternating current component in the second period, the alternating current component in the third period, and the alternating current component in the fourth period.

[0007] According to the magnetic recording device configured as described above, a magnetic recording device capable of achieving an increase in recording density can be provided. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 (a) and Figure 1 (b) are schematic cross-sectional views illustrating a magnetic recording device of the first embodiment.

[0009] Figure 2 (a) and Figure 2 (b) are schematic views illustrating the operation of the magnetic recording device of the first embodiment.

[0010] Figure 3 (a) and Figure 3 (b) are schematic views illustrating the characteristics of the magnetic recording device.

[0011] Figure 4 is a graph illustrating characteristics of the magnetic recording apparatus.

[0012] Figure 5 is a graph illustrating characteristics of the magnetic recording apparatus.

[0013] Figure 6 (a) and Figure 6 (b) are schematic diagrams illustrating the operation of the magnetic recording apparatus.

[0014] Figure 7 (a) and Figure 7 (b) are schematic diagrams illustrating the operation of the magnetic recording apparatus of the first embodiment.

[0015] Figure 8 is a schematic cross-sectional view illustrating the magnetic recording apparatus of the embodiment.

[0016] Figure 9 is a schematic cross-sectional view illustrating the magnetic recording apparatus of the embodiment.

[0017] Figure 10 is a schematic cross-sectional view illustrating the magnetic recording apparatus of the embodiment.

[0018] Figure 11 (a) to Figure 11 (c) are schematic cross-sectional views illustrating the magnetic recording apparatus of the embodiment.

[0019] Figure 12 is a schematic perspective view illustrating the magnetic recording apparatus of the embodiment.

[0020] Figure 13 is a schematic perspective view illustrating a part of the magnetic recording apparatus of the embodiment.

[0021] Figure 14 is a schematic perspective view illustrating the magnetic recording apparatus of the embodiment.

[0022] Figure 15 (a) and Figure 15 (b) are schematic perspective views illustrating a part of the magnetic recording apparatus of the embodiment.

[0023] Explanation of Reference Numerals

[0024] 20...magnetic element, 20D...circuit, 21-24...1st-4th magnetic layers, 30D...recording circuit, 30F...medium facing surface, 30c...coil, 30i...insulating portion, 31, 32...1st, 2nd magnetic poles, 33...shield, 41-45...1st-5th non-magnetic layers, 60...recording portion, 70...reproducing portion, 71...magnetic reproducing element, 72a, 72b...1st, 2nd reproducing magnetic shields, 75...control portion, 80...magnetic recording medium, 81...magnetic recording layer, 82...medium substrate, 83...magnetization, 85...medium moving direction, 110-116...magnetic head, 150...magnetic recording device, 154...suspension, 155...arm, 156...voice coil motor, 157...bearing portion, 158...head gimbal assembly, 159...head slider, 159A...air inflow side, 159B...air outflow side, 160...head stack assembly, 161...support frame, 162...coil, 180...recording medium disk, 180M...spindle motor, 181...recording medium, 190...signal processing portion, 210...magnetic recording device, AR...arrow, BW1...bandwidth, D1...1st direction, Iw...recording current, P1...intensity, RR1...modulation ratio, ST1-ST4...1st-4th periods, T1, T2...1st, 2nd terminals, W1, W2...1st, 2nd wirings, f1, fd...frequencies, iAC...AC component, iACP...amplitude, iDC...DC component, ic...element current, je...electron current, tm...time. DETAILED DESCRIPTION

[0025] (1st Embodiment)

[0026] Figure 1 (a) and Figure 1 (b) are schematic cross-sectional views illustrating the magnetic recording device of the 1st embodiment.

[0027] Figure 1 (b) shows a part of Figure 1 (a) enlarged.

[0028] As Figure 1 shown, the magnetic recording device 210 of the embodiment includes a magnetic head 110 and a control portion 75. The magnetic recording device 210 can also include a magnetic recording medium 80. In the magnetic recording device 210, at least a recording operation is performed. In the recording operation, the magnetic head 110 is used to record information to the magnetic recording medium 80.

[0029] The magnetic head 110 includes a recording portion 60. As described later, the magnetic head 110 can also include a reproducing portion. The recording portion 60 includes a 1st magnetic pole 31, a magnetic element 20, and a coil 30c. In this example, the magnetic head 110 includes a 2nd magnetic pole 32. The magnetic element 20 is disposed between the 1st magnetic pole 31 and the 2nd magnetic pole 32.

[0030] 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, the main magnetic pole. The second magnetic pole 32 is, for example, a trailing shield. Alternatively, the first magnetic pole 31 can be a trailing shield, and the second magnetic pole 32 can be the main magnetic pole.

[0031] The direction from the magnetic recording medium 80 towards the magnetic head 110 is defined as the Z-axis direction. A direction perpendicular to the Z-axis direction is defined as the X-axis direction. A direction perpendicular to both the Z-axis and X-axis directions is defined as the Y-axis direction. The Z-axis direction, for example, corresponds to the height direction. The X-axis direction, for example, corresponds to the track direction. The Y-axis direction, for example, corresponds to the track-crossing direction. The magnetic recording medium 80 and the magnetic head 110 move relative to each other along the track direction. A magnetic field (recording magnetic field) generated by the magnetic head 110 is applied to the desired position of the magnetic recording medium 80. The magnetization of the desired position of the magnetic recording medium 80 is controlled in a direction corresponding to the recording magnetic field. Information is thus recorded onto the magnetic recording medium 80.

[0032] The direction from the first magnetic pole 31 to the second magnetic pole 32 is designated as the first direction D1. The first direction D1 is substantially along the X-axis direction. In an embodiment, the first direction D1 may also be tilted relative to the X-axis direction. The tilt angle is, for example, greater than 0 degrees and less than 10 degrees.

[0033] In this example, a portion of the coil 30c is located between the first magnetic pole 31 and the second magnetic pole 32. A shield 33 is provided in this example. In the X-axis direction, the first magnetic pole 31 is located between the shield 33 and the second magnetic pole 32. Another portion of the coil 30c is located 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 leading shield. The magnetic head 110 may also include a side shield (not shown).

[0034] like Figure 1 As shown in (a), 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.

[0035] like Figure 1 As shown in (a), the first magnetic pole 31 includes a dielectric-facing surface 30F. The dielectric-facing surface 30F is, for example, an ABS (Air Bearing Surface). The dielectric-facing surface 30F is, for example, opposite to the magnetic recording medium 80. The dielectric-facing surface 30F is, for example, along the XY plane.

[0036] like Figure 1(a) shown, the circuit 20D is electrically connected with the magnetic element 20. In this example, the magnetic element 20 is electrically connected with the 1st pole 31 and the 2nd pole 32. The 1st terminal T1 and the 2nd terminal T2 are provided at the magnetic head 110. The 1st terminal T1 is electrically connected with the magnetic element 20 via the 1st wire W1 and the 1st pole 31. The 2nd terminal T2 is electrically connected with the magnetic element 20 via the 2nd wire W2 and the 2nd pole 32. The element current ic is supplied from the circuit 20D to the magnetic element 20, for example.

[0037] The magnetic element 20 includes the 1st magnetic layer 21. In this example, as Figure 1 (b) shown, the magnetic element 20 includes the 1st magnetic layer 21, the 1st non-magnetic layer 41, and the 2nd non-magnetic layer 42. In Figure 1 In (b), the insulating portion 30i is omitted. The 1st magnetic layer 21 contains at least one selected from the group consisting of Fe, Co, and Ni, for example. The 1st non-magnetic layer 41 contains at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag, for example. The 2nd non-magnetic layer 42 contains at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt, and W, for example.

[0038] As Figure 1 (b) shown, the element current ic is supplied to such a magnetic element 20. The element current ic is supplied from the above-described circuit 20D, for example. As Figure 1 (b) shown, the element current ic has an orientation from the 1st magnetic layer 21 to the 2nd magnetic layer 22. As Figure 1 (b) shown, the electron flow je accompanying the element current ic has an orientation from the 2nd magnetic layer 22 to the 1st magnetic layer 21.

[0039] The magnetization of the magnetic element 20 oscillates, for example, by the element current ic above the threshold value flowing in the magnetic element 20. The magnetic element 20 functions as an STO (Spin-Torque Oscillator), for example. An alternating magnetic field (e.g., a high-frequency magnetic field) is generated from the magnetic element 20 accompanying the oscillation. The alternating magnetic field generated in the magnetic element 20 is applied to the magnetic recording medium 80, assisting the writing to the magnetic recording medium 80. MAMR (Microwave Assisted Magnetic Recording) can be implemented, for example.

[0040] In this way, the control portion 75 is electrically connected with the magnetic element 20 and the coil 30c. The control portion 75 can supply the recording current Iw to the coil 30c and the element current ic to the magnetic element 20.

[0041] Hereinafter, examples of the recording current Iw and the element current ic will be described.

[0042] Figure 2 (a) and Figure 2 (b) is a schematic view illustrating an operation of the magnetic recording apparatus of the first embodiment.

[0043] The horizontal axis of these figures is time tm. Figure 2 The vertical axis of (a) is recording current Iw. Figure 2 The vertical axis of (b) is element current ic.

[0044] As Figure 2 As shown in (a), recording current Iw includes a period of a first polarity or a second polarity. The first polarity is one of positive and negative. The second polarity is different from the first polarity. The second polarity is the other of positive and negative. Recording current Iw includes a first period ST1 of the first polarity and a second period ST2 of the second polarity. Recording current Iw includes a third period ST3 that transitions from the first period ST1 to the second period ST2 and a fourth period ST4 that transitions from the second period ST2 to the first period ST1.

[0045] In one example, the first period ST1 corresponds to one of 1 and 0 of recorded information, and the second period ST2 corresponds to the other of 1 and 0 of recorded information.

[0046] In another example, the third period ST3 can correspond to one of 1 and 0 of recorded information, and the fourth period ST4 can correspond to the other of 1 and 0 of recorded information. In this case, a change in polarity corresponds to recorded information.

[0047] The length of each of the first to fourth periods ST1 to ST4 varies depending on the content of recorded information. Such recording current Iw is supplied to coil 30c. As a result, a recording magnetic field corresponding to recording current Iw is generated from at least either of first magnetic pole 31 and second magnetic pole 32. The generated recording magnetic field is applied to magnetic recording medium 80. In magnetic recording medium 80, the orientation of magnetization of a portion to which the recording magnetic field is applied is controlled. For example, the orientation of magnetization corresponds to recorded information. In the embodiment, for example, perpendicular magnetic recording is performed.

[0048] As Figure 2 As shown in (b), element current ic includes a direct current component iDC and an alternating current component iAC. The alternating current component iAC is, for example, a modulated component. As Figure 2 (a) and Figure 2 As shown in (a) and (b), the alternating current component iAC is substantially constant regardless of the state of recording current Iw.

[0049] For example, the AC component iAC in period ST1 is the same as the AC component iAC in period ST2, period ST3, and period ST4. For example, changes in the AC component iAC caused by factors such as coupling can be ignored.

[0050] For example, the AC component iAC has an amplitude iACP. For example, the amplitude iACP in period 1 ST1 is substantially the same as the amplitude iACP in period 2 ST2, period 3 ST3, and period 4 ST4. For example, the change in amplitude iACP caused by the effects of coupling, etc., can be ignored.

[0051] For example, the AC component iAC has a frequency fd. For example, the frequency fd in period 1 ST1 is substantially the same as the frequency fd in period 2 ST2, period 3 ST3, and period 4 ST4. For example, the change in frequency fd caused by the effects of coupling, etc., can be ignored.

[0052] By supplying a current ic to the magnetic element 20, the frequency distribution of the alternating magnetic field generated in the magnetic element 20 is broadened. Therefore, for example, it is possible to practically suppress the effects of frequency variations in the alternating magnetic field caused by manufacturing deviations of the magnetic element 20. Because of the broadened frequency distribution of the alternating magnetic field, for example, even if the magnetic resonance frequency of the magnetic recording medium 80 changes, the magnetic recording medium 80 can more easily resonate with the alternating magnetic field. Practically stable MAMR can be implemented. According to the embodiment, a magnetic recording apparatus that can practically achieve increased recording density can be provided.

[0053] Figure 3 (a) and Figure 3 (b) is a schematic diagram illustrating the characteristics of a magnetic recording device.

[0054] These graphs illustrate the simulation results of the FFT (Fast Fourier Transform) characteristics of the alternating magnetic field generated from magnetic element 20. The horizontal axis of these graphs represents frequency f1. The vertical axis of these graphs represents intensity P1 (power density). Figure 3 In (a), the element current ic includes a DC component iDC and an AC component iAC. In this example, the amplitude iACP of the AC component iAC is half that of the DC component iDC. This condition corresponds to a modulation rate of 50%. Figure 3 In (b), the component current ic includes the DC component iDC but excludes the AC component iAC. The modulation rate is 0%.

[0055] like Figure 3As shown in (b), when the element current ic does not include the AC component iAC, the intensity P1 of the alternating magnetic field has a sharp peak at approximately 36 GHz. In this case, for example, due to manufacturing deviations of the magnetic element 20, the peak frequency of the alternating magnetic field varies sensitively. For example, the peak frequency of the alternating magnetic field is prone to deviate from the magnetic resonance frequency of the magnetic recording medium 80. For example, if the magnetic resonance frequency of the magnetic recording medium 80 changes, the magnetic resonance frequency is also prone to deviate from the peak frequency of the alternating magnetic field. Therefore, it is difficult to implement effective MAMR.

[0056] In contrast, such as Figure 3 As shown in (a), when the element current ic includes an alternating current component iAC, the intensity P1 of the alternating magnetic field is high over a wide range from approximately 26 GHz to approximately 44 GHz. For example, even with manufacturing deviations in the magnetic element 20, the change in the frequency characteristics of the alternating magnetic field is small. The effects of manufacturing deviations can be practically suppressed. For example, even if the magnetic resonance frequency of the magnetic recording medium 80 changes, the magnetic recording medium 80 can still resonate stably with the alternating magnetic field. A practically stable MAMR can be implemented.

[0057] Thus, the current ic through the element includes an alternating current component iAC, and the alternating magnetic field includes a wide frequency range. Therefore, a magnetic recording device that can practically achieve increased recording density can be provided.

[0058] Figure 4 This is a graph illustrating the characteristics of a magnetic recording device.

[0059] Figure 4 The horizontal axis represents the frequency fd (modulation frequency) of the AC component iAC. The vertical axis represents the bandwidth BW1. Bandwidth BW1 is the value of the intensity P1 exceeding 10. -2 The frequency range (the difference between the highest and lowest frequencies). In Figure 4 In this example, the condition that the frequency fd is 0 corresponds to the case where the AC component iAC is not included. In this example, iACP / iDC = 1 / 2, and the modulation rate is 50%.

[0060] like Figure 4 As shown, a large bandwidth BW1 can be obtained when the frequency fd is above 0.2 GHz and below 7 GHz. A particularly large bandwidth can be obtained when the frequency fd is above 0.2 GHz and below 1.6 GHz.

[0061] In this embodiment, the frequency fd of the alternating current component iAC is preferably 0.2 GHz or higher and 7 GHz or lower. This effectively expands the frequency components of the alternating magnetic field. In this embodiment, the frequency fd is further preferably 0.2 GHz or higher and 1.6 GHz or lower. This further effectively expands the frequency components of the alternating magnetic field.

[0062] In the embodiment, the frequency fd of the alternating component iAC is preferably 1 / 5 or less of the highest frequency of the strength Pl of the alternating magnetic field generated from the magnetic element 20 in the case where the element current ic does not include the alternating component iAC (for example, refer to Figure 3 (b) The strength Pl of the alternating magnetic field generated from the magnetic element 20 in the case where the element current ic does not include the alternating component iAC becomes 1 / 5 or less of the highest frequency. The frequency component of the alternating magnetic field is effectively further spread. In the example of Figure 3 (b), the strength Pl of the alternating magnetic field generated from the magnetic element 20 in the case where the element current ic does not include the alternating component iAC is about 36 GHz of the highest frequency.

[0063] Figure 5 is a graph illustrating characteristics of the magnetic recording apparatus.

[0064] Figure 5 The horizontal axis is the modulation ratio RR1. The modulation ratio RR1 is the ratio of the amplitude iACP of the alternating component iAC to the absolute value of the direct current component iDC (iACP / iDC). The vertical axis is the bandwidth BW1. In this example, the frequency fd of the alternating component iAC is 3 GHz.

[0065] As shown in Figure 5 , if the modulation ratio RR1 becomes high, the bandwidth BW1 becomes large. In the embodiment, the modulation ratio RR1 (the ratio of the amplitude iACP of the alternating component iAC to the absolute value of the direct current component iDC) is, for example, 0.1 or more. The frequency component of the alternating magnetic field is effectively spread.

[0066] In the embodiment, the modulation ratio RR1 (the ratio of the amplitude iACP of the alternating component iAC to the absolute value of the direct current component iDC) can also be, for example, 0.5 or more. The frequency component of the alternating magnetic field is more effectively spread.

[0067] In the embodiment, the modulation ratio RR1 (the ratio of the amplitude iACP of the alternating component iAC to the absolute value of the direct current component iDC) is, for example, 2.0 or less. In this case, the element current ic is positive and does not become negative.

[0068] In the embodiment, the current density of the element current ic in the magnetic element 20 is, for example, preferably 5 x 10 8 A / cm 2 or more. Thereby, the characteristics of the magnetic element 20 are easily stabilized. For example, the damage of the magnetic element 20 is suppressed.

[0069] In the above example, the alternating component iAC is sinusoidal. In the embodiment, the alternating component iAC can have an arbitrary waveform.

[0070] Figure 6 (a) and Figure 6 (b) are schematic diagrams illustrating the operation of the magnetic recording apparatus.

[0071] The horizontal axis of these graphs is time tm. The vertical axis of these graphs is element current ic.

[0072] In Figure 6 In the example shown in (a), the alternating component iAC is square wave-like. The alternating component iAC can also be triangular wave-like. In Figure 6 In the example shown in (a), the alternating component iAC has a sawtooth shape. In the sawtooth shape, the rising waveform is different from the falling waveform. In the embodiment, the alternating component iAC can have an arbitrary waveform.

[0073] Figure 7 (a) and Figure 7 (b) are schematic diagrams illustrating the operation of the magnetic recording device of the first embodiment.

[0074] The horizontal axis of these graphs is time tm. Figure 7 The vertical axis of (a) is recording current Iw. Figure 7 The vertical axis of (b) is element current ic.

[0075] As Figure 7 shown in (a), the recording current Iw includes the first to fourth periods ST1 to ST4. As Figure 7 shown in (b), the phase of the alternating component iAC of the element current ic is synchronized with the third period ST3 and the fourth period ST4. For example, the phase of the alternating component iAC is synchronized with the timing at which the recording current Iw becomes 0. In this way, in the embodiment, the phase of the alternating component iAC can also be synchronized with at least either one of the third period ST3 and the fourth period ST4. By synchronization, for example, it is possible to suppress the generation of useless noise at the intended timing due to the influence of coupling or the like. It is possible to implement a more stable MAMR.

[0076] Figure 8 is a schematic cross-sectional view illustrating the magnetic recording device of the embodiment.

[0077] As Figure 8 shown in (a), the magnetic element 20 includes the first magnetic layer 21, the second magnetic layer 22 provided between the first magnetic layer 21 and the second magnetic pole 32, the first nonmagnetic layer 41 provided between the first magnetic pole 31 and the first magnetic layer 21, the second nonmagnetic layer 42 provided between the first magnetic layer 21 and the second magnetic layer 22, and the third nonmagnetic layer 43 provided between the second magnetic layer 22 and the second magnetic pole 32.

[0078] In one example of the magnetic head 111, the first magnetic layer 21 includes at least one selected from the group consisting of Fe, Co, and Ni. The second magnetic layer 22 includes at least one selected from the group consisting of Fe, Co, and Ni. The first non-magnetic layer 41 includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag or at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt, and W. The second non-magnetic layer 42 includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag. The third non-magnetic layer 43 includes at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt, and W.

[0079] In another example of the magnetic head 111, the first magnetic layer 21 includes at least one selected from the group consisting of Fe, Co, and Ni. The second magnetic layer 22 includes at least one selected from the group consisting of Fe, Co, and Ni and at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc. The first non-magnetic layer 41 includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag or at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt, and W. The second non-magnetic layer 42 includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag. The third non-magnetic layer 43 includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag.

[0080] Figure 9 is a schematic cross-sectional view of a magnetic recording device of an example embodiment.

[0081] As Figure 9 shown in the magnetic head 112 of the example embodiment, the magnetic element 20 includes the first magnetic layer 21, the second magnetic layer 22 disposed between the first magnetic layer 21 and the second pole 32, the third magnetic layer 23 disposed between the second magnetic layer 22 and the second pole 32, the first non-magnetic layer 41 disposed between the first pole 31 and the first magnetic layer 21, the second non-magnetic layer 42 disposed between the first magnetic layer 21 and the second magnetic layer 22, the third non-magnetic layer 43 disposed between the second magnetic layer 22 and the third magnetic layer 23, and the fourth non-magnetic layer 44 disposed between the third magnetic layer 23 and the second pole 32.

[0082] In one example of the magnetic head 112, the first magnetic layer 21 contains at least one element selected from the group consisting of Fe, Co, and Ni. The second magnetic layer 22 contains at least one element selected from the group consisting of Fe, Co, and Ni. The third magnetic layer 23 contains at least one element selected from the group consisting of Fe, Co, and Ni. The first non-magnetic layer 41 contains at least one element selected from the group consisting of Cu, Au, Cr, V, Al, and Ag. The second non-magnetic layer 42 contains at least one element selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt, and W. The third non-magnetic layer 43 contains at least one element selected from the group consisting of Cu, Au, Cr, V, Al, and Ag. The fourth non-magnetic layer 44 contains at least one element selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt, and W.

[0083] In other examples of the magnetic head 112, the first magnetic layer 21 contains at least one element selected from the group consisting of Fe, Co, and Ni. The second magnetic layer 22 contains at least one element selected from the group consisting of Fe, Co, and Ni. The third magnetic layer 23 contains at least one element selected from the group consisting of Fe, Co, and Ni and at least one element selected from the group consisting of Cr, V, Mn, Ti, and Sc. The first non-magnetic layer 41 contains at least one element selected from the group consisting of Cu, Au, Cr, V, Al, and Ag. The second non-magnetic layer 42 contains at least one element selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt, and W. The third non-magnetic layer 43 contains at least one element selected from the group consisting of Cu, Au, Cr, V, Al, and Ag. The fourth non-magnetic layer 44 contains at least one element selected from the group consisting of Cu, Au, Cr, V, Al, and Ag.

[0084] Figure 10 This is a schematic cross-sectional view of a magnetic recording apparatus illustrating an embodiment.

[0085] like Figure 10 As shown, in the magnetic head 113 of the embodiment, the magnetic element 20 includes a first magnetic layer 21, a second magnetic layer 22 disposed between the first magnetic layer 21 and the second magnetic pole 32, a third magnetic layer 23 disposed between the second magnetic layer 22 and the second magnetic pole 32, a fourth magnetic layer 24 disposed between the third magnetic layer 23 and the second magnetic pole 32, a first non-magnetic layer 41 disposed between the first magnetic pole 31 and the first magnetic layer 21, a second non-magnetic layer 42 disposed between the first magnetic layer 21 and the second magnetic layer 22, a third non-magnetic layer 43 disposed between the second magnetic layer 22 and the third magnetic layer 23, a fourth non-magnetic layer 44 disposed between the third magnetic layer 23 and the fourth magnetic layer 24, and a fifth non-magnetic layer 45 disposed between the fourth magnetic layer 24 and the second magnetic pole 32.

[0086] In one example of the magnetic head 113, the first magnetic layer 21 includes at least one selected from the group consisting of Fe, Co, and Ni. The second magnetic layer 22 includes at least one selected from the group consisting of Fe, Co, and Ni. The third magnetic layer 23 includes at least one selected from the group consisting of Fe, Co, and Ni. The fourth magnetic layer 24 includes at least one selected from the group consisting of Fe, Co, and Ni. The first non-magnetic layer 41 includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag. The second non-magnetic layer 42 includes at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt, and W. The third non-magnetic layer 43 includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag. The fourth non-magnetic layer 44 includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag. The fifth non-magnetic layer 45 includes at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt, and W.

[0087] In another example of the magnetic head 113, the first magnetic layer 21 includes at least one selected from the group consisting of Fe, Co, and Ni. The second magnetic layer 22 includes at least one selected from the group consisting of Fe, Co, and Ni. The third magnetic layer 23 includes at least one selected from the group consisting of Fe, Co, and Ni. The fourth magnetic layer 24 includes at least one selected from the group consisting of Fe, Co, and Ni. The first non-magnetic layer 41 includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag or at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt, and W. The second non-magnetic layer 42 includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag. The third non-magnetic layer 43 includes at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt, and W. The fourth non-magnetic layer 44 includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag. The fifth non-magnetic layer 45 includes at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt, and W.

[0088] In another example of the magnetic head 113, the first magnetic layer 21 includes at least one selected from the group consisting of Fe, Co, and Ni. The second magnetic layer 22 includes at least one selected from the group consisting of Fe, Co, and Ni. The third magnetic layer 23 includes at least one selected from the group consisting of Fe, Co, and Ni. The fourth magnetic layer 24 includes at least one selected from the group consisting of Fe, Co, and Ni and at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc. The first non-magnetic layer 41 includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag. The second non-magnetic layer 42 includes at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt, and W. The third non-magnetic layer 43 includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag. The fourth non-magnetic layer 44 includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag. The fifth non-magnetic layer 45 includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag.

[0089] In another example of the magnetic head 113, the first magnetic layer 21 includes at least one selected from the group consisting of Fe, Co, and Ni. The second magnetic layer 22 includes at least one selected from the group consisting of Fe, Co, and Ni. The third magnetic layer 23 includes at least one selected from the group consisting of Fe, Co, and Ni. The fourth magnetic layer 24 includes at least one selected from the group consisting of Fe, Co, and Ni and at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc. The first non-magnetic layer 41 includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag or at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt, and W. The second non-magnetic layer 42 includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag. The third non-magnetic layer 43 includes at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt, and W. The fourth non-magnetic layer 44 includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag. The fifth non-magnetic layer 45 includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag.

[0090] Figure 11 (a) ~ Figure 11 (c) is a schematic cross-sectional view of a magnetic recording device of an example embodiment.

[0091] As Figure 11(a) In the magnetic head 114 of the embodiment shown, the magnetic element 20 includes the first magnetic layer 21, the second magnetic layer 22 disposed between the first magnetic layer 21 and the second pole 32 and in contact with the second pole 32, the first non-magnetic layer 41 disposed between the first pole 31 and the first magnetic layer 21, and the second non-magnetic layer 42 disposed between the first magnetic layer 21 and the second magnetic layer 22.

[0092] In the magnetic head 114, the first magnetic layer 21 contains at least one selected from the group consisting of Fe, Co, and Ni. The second magnetic layer 22 contains at least one selected from the group consisting of Fe, Co, and Ni and at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc. The first non-magnetic layer 41 contains at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag or at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt, and W. The second non-magnetic layer 42 contains at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag.

[0093] As Figure 11 (b) In the magnetic head 115 of the embodiment shown, the magnetic element 20 includes the first magnetic layer 21, the second magnetic layer 22 disposed between the first magnetic layer 21 and the second pole 32, the third magnetic layer 23 disposed between the second magnetic layer 22 and the second pole 32 and in contact with the second pole 32, the first non-magnetic layer 41 disposed between the first pole 31 and the first magnetic layer 21, the second non-magnetic layer 42 disposed between the first magnetic layer 21 and the second magnetic layer 22, and the third non-magnetic layer 43 disposed between the second magnetic layer 22 and the third magnetic layer 23.

[0094] In the magnetic head 115, the first magnetic layer 21 contains at least one selected from the group consisting of Fe, Co, and Ni. The second magnetic layer 22 contains at least one selected from the group consisting of Fe, Co, and Ni. The third magnetic layer 23 contains at least one selected from the group consisting of Fe, Co, and Ni and at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc. The first non-magnetic layer 41 contains at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag. The second non-magnetic layer 42 contains at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt, and W. The third non-magnetic layer 43 contains at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag.

[0095] As Figure 11(c) In the magnetic head 116 of the embodiment shown, the magnetic element 20 includes a first magnetic layer 21, a second magnetic layer 22 disposed between the first magnetic layer 21 and the second pole layer 32, a third magnetic layer 23 disposed between the second magnetic layer 22 and the second pole layer 32, a fourth magnetic layer 24 disposed between the third magnetic layer 23 and the second pole layer 32 and in contact with the second pole layer 32, a first non-magnetic layer 41 disposed between the first pole layer 31 and the first magnetic layer 21, a second non-magnetic layer 42 disposed between the first magnetic layer 21 and the second magnetic layer 22, a third non-magnetic layer 43 disposed between the second magnetic layer 22 and the third magnetic layer 23, and a fourth non-magnetic layer 44 disposed between the third magnetic layer 23 and the fourth magnetic layer 24.

[0096] In one example of the magnetic head 116, the first magnetic layer 21 includes at least one selected from the group consisting of Fe, Co, and Ni. The second magnetic layer 22 includes at least one selected from the group consisting of Fe, Co, and Ni. The third magnetic layer 23 includes at least one selected from the group consisting of Fe, Co, and Ni. The fourth magnetic layer 24 includes at least one selected from the group consisting of Fe, Co, and Ni and at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc. The first non-magnetic layer 41 includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag. The second non-magnetic layer 42 includes at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt, and W. The third non-magnetic layer 43 includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag. The fourth non-magnetic layer 44 includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag.

[0097] In the magnetic head 116, the first magnetic layer 21 includes at least one selected from the group consisting of Fe, Co, and Ni. The second magnetic layer 22 includes at least one selected from the group consisting of Fe, Co, and Ni. The third magnetic layer 23 includes at least one selected from the group consisting of Fe, Co, and Ni. The fourth magnetic layer 24 includes at least one selected from the group consisting of Fe, Co, and Ni and at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc. The first non-magnetic layer 41 includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag or at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt, and W. The second non-magnetic layer 42 includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag. The third non-magnetic layer 43 includes at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt, and W. The fourth non-magnetic layer 44 includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag.

[0098] In each of the above-described magnetic heads, in a case where the magnetic layer contains at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc, the magnetic layer has a negative spin polarization. In a case where the magnetic layer does not substantially contain at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc, the magnetic layer has a positive spin polarization.

[0099] Figure 12 is a schematic perspective view of a magnetic recording apparatus of an embodiment.

[0100] As Figure 12 indicated, a magnetic head (e.g., magnetic head 110) of an embodiment is used with a magnetic recording medium 80. In this example, the magnetic head 110 includes a recording portion 60 and a reproducing portion 70. Information is recorded to the magnetic recording medium 80 by the recording portion 60 of the magnetic head 110. Information recorded to the magnetic recording medium 80 is reproduced by the reproducing portion 70.

[0101] The magnetic recording medium 80 includes, for example, a medium substrate 82 and a magnetic recording layer 81 disposed on the medium substrate 82. Magnetization 83 of the magnetic recording layer 81 is controlled by the recording portion 60.

[0102] The reproducing portion 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 disposed between the first reproducing magnetic shield 72a and the second reproducing magnetic shield 72b. The magnetic reproducing element 71 is capable of outputting a signal corresponding to the magnetization 83 of the magnetic recording layer 81.

[0103] As Figure 12 indicated, the magnetic recording medium 80 is relatively moved in a direction of a medium moving direction 85 with respect to the magnetic head 110. 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.

[0104] As Figure 12 indicated, a coil 30c can also be disposed around the second magnetic pole 32. The second magnetic pole 32 forms a magnetic circuit together with the first magnetic pole 31. The first magnetic pole 31 and the second magnetic pole 32 are excited by the coil 30c. As explained with respect to Figure 1 (a), the coil 30c can also be disposed around the first magnetic pole 31.

[0105] Figure 13 is a schematic perspective view of a portion of a magnetic recording apparatus of an embodiment.

[0106] Figure 13 A head slider is exemplified.

[0107] The magnetic head 110 is provided to the head slider 159. The head slider 159 includes, for example, Al203 / TiC or the like. The head slider 159 is relatively moved with respect to the magnetic recording medium while floating or contacting on the magnetic recording medium.

[0108] 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 the side of the air outflow side 159B of the head slider 159 or the like. Thus, the magnetic head 110 is relatively moved with respect to the magnetic recording medium while floating or contacting on the magnetic recording medium.

[0109] Figure 14 Fig. 1 is a schematic perspective view of a magnetic recording apparatus of an embodiment.

[0110] Figure 15 (a) and Figure 15 (b) are schematic perspective views of a part of a magnetic recording apparatus of an embodiment.

[0111] As Figure 14 shown, in the magnetic recording apparatus 150 of the embodiment, a rotary actuator is used. A recording medium disk 180 is attached to a spindle motor 180M. The recording medium disk 180 is rotated in the direction of an arrow AR by the spindle motor 180M. The spindle motor 180M responds to a control signal from a drive apparatus control section. The magnetic recording apparatus 150 of the embodiment can also be provided with a plurality of recording medium disks 180. The magnetic recording apparatus 150 can also include a recording medium 181. The recording medium 181 is, for example, an SSD (Solid State Drive). For the recording medium 181, a nonvolatile memory such as a flash memory is used. For example, the magnetic recording apparatus 150 can also be a hybrid HDD (Hard Disk Drive).

[0112] The head slider 159 performs recording and reproduction of information recorded to the recording medium disk 180. The head slider 159 is provided to the front end of a thin film-like suspension 154. The magnetic head of the embodiment is provided near the front end of the head slider 159.

[0113] If the recording medium disk 180 is rotated, the pressing force of the suspension 154 is balanced with the pressure generated on a medium opposing surface (ABS) of the head slider 159. The distance between the medium opposing 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 can also be in contact with the recording medium disk 180. For example, a contact walk type can also be applied.

[0114] The suspension 154 is connected to one end of the arm 155 (e.g., 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 one 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. A magnetic head is provided at one end of the suspension 154. The arm 155 is connected to the other end of the suspension 154.

[0115] The arm 155 is held by a ball bearing. The ball bearing is provided at two places above and below the bearing portion 157. The arm 155 is rotatable and slidable by the voice coil motor 156. The magnetic head is movable to an arbitrary position of the recording medium disk 180.

[0116] Figure 15 (a) illustrates a configuration of a part of a magnetic recording apparatus, which is an enlarged perspective view of a head stack assembly 160.

[0117] Figure 15 (b) is a perspective view illustrating a head assembly (head gimbal assembly: HGA) 158 that is a part of the head stack assembly 160.

[0118] As shown in Figure 15 (a), the head stack assembly 160 includes the bearing portion 157, the 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 support frame 161 extends in a direction opposite to the extending direction of the head gimbal assembly 158. The support frame 161 supports a coil 162 of the voice coil motor 156.

[0119] As shown in Figure 15 (b), the head gimbal assembly 158 has the arm 155 extending from the bearing portion 157 and the suspension 154 extending from the arm 155.

[0120] A head slider 159 is provided at the front end of the suspension 154. The magnetic head of the embodiment is provided at the head slider 159.

[0121] The 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.

[0122] The suspension 154 has, for example, a lead wire (not shown) for recording and reproducing a signal. The suspension 154 can also have, for example, a lead wire (not shown) for a heater for adjusting a floating amount. The suspension 154 can also have, for example, a lead wire (not shown) for a spin torque oscillator, and the like. These lead wires are electrically connected to the plurality of electrodes provided to the magnetic head.

[0123] In the magnetic recording apparatus 150, a signal processing section 190 is provided. The signal processing section 190 performs recording and reproducing of a signal to the magnetic recording medium using the magnetic head. In the signal processing section 190, an input and output line of the signal processing section 190 is connected to the electrode pad of the head gimbal assembly 158, for example, and is electrically connected to the magnetic head.

[0124] The magnetic recording apparatus 150 of the embodiment includes a magnetic recording medium, the magnetic head of the embodiment, a movable section, a position control section, and a signal processing section. The movable section allows the magnetic recording medium and the magnetic head to relatively move in a separated or contacted state. The position control section aligns the magnetic head to a predetermined recording position of the magnetic recording medium. The signal processing section performs recording and reproducing of a signal to the magnetic recording medium using the magnetic head.

[0125] For example, as the magnetic recording medium described above, a recording medium disk 180 is used. The movable section described above includes, for example, the head slider 159. The position control section described above includes, for example, the head gimbal assembly 158.

[0126] The embodiment can also include the following technical solutions.

[0127] (Technical Solution 1)

[0128] A magnetic recording apparatus includes:

[0129] a magnetic head including a first magnetic pole, a magnetic element including a first magnetic layer, and a coil; and

[0130] a control section electrically connected to the magnetic element and the coil, capable of supplying a recording current to the coil and an element current to the magnetic element,

[0131] the recording current includes a first period of a first polarity, a second period of a second polarity different from the first polarity, a third period transitioning from the first period to the second period, and a fourth period transitioning from the second period to the first period,

[0132] the element current includes a direct current component and an alternating current component, and the alternating current component in the first period is identical to the alternating current component in the second period, the alternating current component in the third period, and the alternating current component in the fourth period.

[0133] (Technical Solution 2)

[0134] The magnetic recording device according to the technical solution 1,

[0135] The ratio of the amplitude of the alternating component to the absolute value of the direct current component is 0.1 or more.

[0136] (Technical solution 3)

[0137] The magnetic recording device according to the technical solution 1,

[0138] The ratio of the amplitude of the alternating component to the absolute value of the direct current component is 0.5 or more.

[0139] (Technical solution 4)

[0140] The magnetic recording device according to any one of the technical solutions 1 to 3,

[0141] The frequency of the alternating component is 0.2 GHz or more and 7 GHz or less.

[0142] (Technical solution 5)

[0143] The magnetic recording device according to any one of the technical solutions 1 to 3,

[0144] Further provided is a magnetic recording medium,

[0145] The frequency of the alternating component is 1 / 5 or less of the frequency at which the strength of the alternating magnetic field generated from the magnetic element when the element current does not include the alternating component is the highest.

[0146] (Technical solution 6)

[0147] The magnetic recording device according to any one of the technical solutions 1 to 3,

[0148] The current density of the element current in the magnetic element is 5 x 10 8 A / cm 2 or more.

[0149] (Technical solution 7)

[0150] The magnetic recording device according to any one of the technical solutions 1 to 6,

[0151] The phase of the alternating component is synchronized with at least either the third period or the fourth period.

[0152] (Technical solution 8)

[0153] The magnetic recording device according to any one of the technical solutions 1 to 7,

[0154] The magnetic element generates an alternating magnetic field.

[0155] (Technical solution 9)

[0156] The magnetic recording device according to any one of the technical solutions 1-8,

[0157] The magnetic head further comprises a second magnetic pole,

[0158] The magnetic element is disposed between the first magnetic pole and the second magnetic pole.

[0159] (Technical solution 10)

[0160] The magnetic recording device according to the technical solution 9,

[0161] The magnetic element further comprises:

[0162] A first non-magnetic layer disposed between the first magnetic pole and the first magnetic layer; and

[0163] A second non-magnetic layer disposed between the first magnetic layer and the second magnetic pole,

[0164] The first magnetic layer contains at least one selected from the group consisting of Fe, Co and Ni,

[0165] The first non-magnetic layer contains at least one selected from the group consisting of Cu, Au, Cr, V, Al and Ag,

[0166] The second non-magnetic layer contains at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt and W.

[0167] (Technical solution 11)

[0168] The magnetic recording device according to the technical solution 9,

[0169] The magnetic element further comprises:

[0170] A second magnetic layer disposed between the first magnetic layer and the second magnetic pole;

[0171] A first non-magnetic layer disposed between the first magnetic pole and the first magnetic layer;

[0172] A second non-magnetic layer disposed between the first magnetic layer and the second magnetic layer; and

[0173] A third non-magnetic layer disposed between the second magnetic layer and the second magnetic pole,

[0174] The first magnetic layer contains at least one selected from the group consisting of Fe, Co and Ni,

[0175] The second magnetic layer contains at least one selected from the group consisting of Fe, Co and Ni,

[0176] The first non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag, or at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt, and W,

[0177] The second non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag,

[0178] The third non-magnetic layer includes at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt, and W.

[0179] (claim 12)

[0180] The magnetic recording device according to claim 9,

[0181] The magnetic element further includes:

[0182] a second magnetic layer disposed between the first magnetic layer and the second magnetic pole;

[0183] a first non-magnetic layer disposed between the first magnetic pole and the first magnetic layer;

[0184] a second non-magnetic layer disposed between the first magnetic layer and the second magnetic layer; and

[0185] a third non-magnetic layer disposed between the second magnetic layer and the second magnetic pole,

[0186] The first magnetic layer includes at least one selected from the group consisting of Fe, Co, and Ni,

[0187] The second magnetic layer includes at least one selected from the group consisting of Fe, Co, and Ni, and at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc,

[0188] The first non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag, or at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt, and W,

[0189] The second non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag,

[0190] The third non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag.

[0191] (claim 13)

[0192] The magnetic recording device according to claim 9,

[0193] The magnetic element further includes:

[0194] a second magnetic layer disposed between the first magnetic layer and the second pole;

[0195] a third magnetic layer disposed between the second magnetic layer and the second pole;

[0196] a first non-magnetic layer disposed between the first pole and the first magnetic layer;

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

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

[0199] a fourth non-magnetic layer disposed between the third magnetic layer and the second pole,

[0200] the first magnetic layer includes at least one selected from the group consisting of Fe, Co, and Ni,

[0201] the second magnetic layer includes at least one selected from the group consisting of Fe, Co, and Ni,

[0202] the third magnetic layer includes at least one selected from the group consisting of Fe, Co, and Ni,

[0203] the first non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag,

[0204] the second non-magnetic layer includes at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt, and W,

[0205] the third non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag,

[0206] the fourth non-magnetic layer includes at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt, and W.

[0207] (Technical Solution 14)

[0208] the magnetic recording device according to Technical Solution 9,

[0209] The magnetic element further includes:

[0210] a second magnetic layer disposed between the first magnetic layer and the second pole;

[0211] a third magnetic layer disposed between the second magnetic layer and the second pole;

[0212] a first non-magnetic layer disposed between the first magnetic pole and the first magnetic layer;

[0213] a second non-magnetic layer disposed between the first magnetic layer and the second magnetic layer;

[0214] a third non-magnetic layer disposed between the second magnetic layer and the third magnetic layer; and

[0215] a fourth non-magnetic layer disposed between the third magnetic layer and the second magnetic pole,

[0216] the first magnetic layer includes at least one selected from the group consisting of Fe, Co, and Ni,

[0217] the second magnetic layer includes at least one selected from the group consisting of Fe, Co, and Ni,

[0218] the third magnetic layer includes at least one selected from the group consisting of Fe, Co, and Ni, and at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc,

[0219] the first non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag,

[0220] the second non-magnetic layer includes at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt, and W,

[0221] the third non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag,

[0222] the fourth non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag.

[0223] (Technical Solution 15)

[0224] the magnetic recording device according to Technical Solution 9,

[0225] the magnetic element further includes:

[0226] a second magnetic layer disposed between the first magnetic layer and the second magnetic pole;

[0227] a third magnetic layer disposed between the second magnetic layer and the second magnetic pole;

[0228] a fourth magnetic layer disposed between the third magnetic layer and the second magnetic pole;

[0229] a first non-magnetic layer disposed between the first magnetic pole and the first magnetic layer;

[0230] a first non-magnetic layer provided between the first magnetic layer and the second magnetic layer;

[0231] a third non-magnetic layer provided between the second magnetic layer and the third magnetic layer;

[0232] a fourth non-magnetic layer provided between the third magnetic layer and the fourth magnetic layer; and

[0233] a fifth non-magnetic layer provided between the fourth magnetic layer and the second pole,

[0234] the first magnetic layer includes at least one selected from the group consisting of Fe, Co, and Ni,

[0235] the second magnetic layer includes at least one selected from the group consisting of Fe, Co, and Ni,

[0236] the third magnetic layer includes at least one selected from the group consisting of Fe, Co, and Ni,

[0237] the fourth magnetic layer includes at least one selected from the group consisting of Fe, Co, and Ni,

[0238] the first non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag,

[0239] the second non-magnetic layer includes at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt, and W,

[0240] the third non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag,

[0241] the fourth non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag,

[0242] the fifth non-magnetic layer includes at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt, and W.

[0243] (technical solution 16)

[0244] the magnetic recording device according to technical solution 9,

[0245] the magnetic element further includes:

[0246] a second magnetic layer provided between the first magnetic layer and the second pole;

[0247] a third magnetic layer provided between the second magnetic layer and the second pole;

[0248] a fourth magnetic layer disposed between the third magnetic layer and the fourth magnetic pole;

[0249] a first non-magnetic layer disposed between the first magnetic pole and the first magnetic layer;

[0250] a second non-magnetic layer disposed between the first magnetic layer and the second magnetic layer;

[0251] a third non-magnetic layer disposed between the second magnetic layer and the third magnetic layer;

[0252] a fourth non-magnetic layer disposed between the third magnetic layer and the fourth magnetic layer; and

[0253] a fifth non-magnetic layer disposed between the fourth magnetic layer and the second magnetic pole,

[0254] the first magnetic layer includes at least one selected from the group consisting of Fe, Co, and Ni,

[0255] the second magnetic layer includes at least one selected from the group consisting of Fe, Co, and Ni,

[0256] the third magnetic layer includes at least one selected from the group consisting of Fe, Co, and Ni,

[0257] the fourth magnetic layer includes at least one selected from the group consisting of Fe, Co, and Ni,

[0258] the first non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag, or at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt, and W,

[0259] the second non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag,

[0260] the third non-magnetic layer includes at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt, and W,

[0261] the fourth non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag,

[0262] the fifth non-magnetic layer includes at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt, and W.

[0263] (technical solution 17)

[0264] the magnetic recording device according to technical solution 9,

[0265] the magnetic element further comprises:

[0266] a second magnetic layer disposed between the first magnetic layer and the second pole;

[0267] a third magnetic layer disposed between the second magnetic layer and the second pole;

[0268] a fourth magnetic layer disposed between the third magnetic layer and the second pole;

[0269] a first non-magnetic layer disposed between the first pole and the first magnetic layer;

[0270] a second non-magnetic layer disposed between the first magnetic layer and the second magnetic layer;

[0271] a third non-magnetic layer disposed between the second magnetic layer and the third magnetic layer;

[0272] a fourth non-magnetic layer disposed between the third magnetic layer and the fourth magnetic layer; and

[0273] a fifth non-magnetic layer disposed between the fourth magnetic layer and the second pole,

[0274] the first magnetic layer includes at least one selected from the group consisting of Fe, Co, and Ni,

[0275] the second magnetic layer includes at least one selected from the group consisting of Fe, Co, and Ni,

[0276] the third magnetic layer includes at least one selected from the group consisting of Fe, Co, and Ni,

[0277] the fourth magnetic layer includes at least one selected from the group consisting of Fe, Co, and Ni, and at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc,

[0278] the first non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag,

[0279] the second non-magnetic layer includes at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt, and W,

[0280] the third non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag,

[0281] the fourth non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag,

[0282] the fifth non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag.

[0283] (technical solution 18)

[0284] The magnetic recording device according to the technical solution 9,

[0285] The magnetic element further includes:

[0286] a second magnetic layer disposed between the first magnetic layer and the second pole;

[0287] a third magnetic layer disposed between the second magnetic layer and the second pole;

[0288] a fourth magnetic layer disposed between the third magnetic layer and the second pole;

[0289] a first non-magnetic layer disposed between the first pole and the first magnetic layer;

[0290] a second non-magnetic layer disposed between the first magnetic layer and the second magnetic layer;

[0291] a third non-magnetic layer disposed between the second magnetic layer and the third magnetic layer;

[0292] a fourth non-magnetic layer disposed between the third magnetic layer and the fourth magnetic layer; and

[0293] a fifth non-magnetic layer disposed between the fourth magnetic layer and the second pole,

[0294] The first magnetic layer includes at least one selected from the group consisting of Fe, Co, and Ni,

[0295] The second magnetic layer includes at least one selected from the group consisting of Fe, Co, and Ni,

[0296] The third magnetic layer includes at least one selected from the group consisting of Fe, Co, and Ni,

[0297] The fourth magnetic layer includes at least one selected from the group consisting of Fe, Co, and Ni, and at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc,

[0298] The first non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag, or at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt, and W,

[0299] The second non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag,

[0300] The 3rd non-magnetic layer includes at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt, and W,

[0301] The 4th non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag,

[0302] The 5th non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag.

[0303] (Embodiment 19)

[0304] The magnetic recording device according to Embodiment 9,

[0305] The magnetic element further includes:

[0306] A 2nd magnetic layer disposed between the 1st magnetic layer and the 2nd magnetic pole and in contact with the 2nd magnetic pole;

[0307] A 1st non-magnetic layer disposed between the 1st magnetic pole and the 1st magnetic layer; and

[0308] A 2nd non-magnetic layer disposed between the 1st magnetic layer and the 2nd magnetic layer,

[0309] The 1st magnetic layer includes at least one selected from the group consisting of Fe, Co, and Ni,

[0310] The 2nd magnetic layer includes at least one selected from the group consisting of Fe, Co, and Ni and at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc,

[0311] The 1st non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag or at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt, and W,

[0312] The 2nd non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag.

[0313] (Embodiment 20)

[0314] The magnetic recording device according to Embodiment 9,

[0315] The magnetic element further includes:

[0316] A 2nd magnetic layer disposed between the 1st magnetic layer and the 2nd magnetic pole;

[0317] A 3rd magnetic layer disposed between the 2nd magnetic layer and the 2nd magnetic pole and in contact with the 2nd magnetic pole;

[0318] a first non-magnetic layer disposed between the first magnetic pole and the first magnetic layer;

[0319] a second non-magnetic layer disposed between the first magnetic layer and the second magnetic layer; and

[0320] a third non-magnetic layer disposed between the second magnetic layer and the third magnetic layer,

[0321] the first magnetic layer includes at least one selected from the group consisting of Fe, Co, and Ni,

[0322] the second magnetic layer includes at least one selected from the group consisting of Fe, Co, and Ni,

[0323] the third magnetic layer includes at least one selected from the group consisting of Fe, Co, and Ni, and at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc,

[0324] the first non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag,

[0325] the second non-magnetic layer includes at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt, and W,

[0326] the third non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag.

[0327] (Technical Solution 21)

[0328] the magnetic recording device according to Technical Solution 9,

[0329] the magnetic element further includes:

[0330] a second magnetic layer disposed between the first magnetic layer and the second magnetic pole;

[0331] a third magnetic layer disposed between the second magnetic layer and the second magnetic pole;

[0332] a fourth magnetic layer disposed between the third magnetic layer and the second magnetic pole, and in contact with the second magnetic pole;

[0333] a first non-magnetic layer disposed between the first magnetic pole and the first magnetic layer;

[0334] a second non-magnetic layer disposed between the first magnetic layer and the second magnetic layer;

[0335] a third non-magnetic layer disposed between the second magnetic layer and the third magnetic layer; and

[0336] a fourth non-magnetic layer disposed between the third magnetic layer and the fourth magnetic layer,

[0337] the first magnetic layer includes at least one selected from the group consisting of Fe, Co, and Ni,

[0338] the second magnetic layer includes at least one selected from the group consisting of Fe, Co, and Ni,

[0339] the third magnetic layer includes at least one selected from the group consisting of Fe, Co, and Ni,

[0340] the fourth magnetic layer includes at least one selected from the group consisting of Fe, Co, and Ni, and at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc,

[0341] the first non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag,

[0342] the second non-magnetic layer includes at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt, and W,

[0343] the third non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag,

[0344] the fourth non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag.

[0345] (Technical Solution 22)

[0346] the magnetic recording device according to Technical Solution 9,

[0347] the magnetic element further includes:

[0348] a second magnetic layer disposed between the first magnetic layer and the second magnetic pole;

[0349] a third magnetic layer disposed between the second magnetic layer and the second magnetic pole;

[0350] a fourth magnetic layer disposed between the third magnetic layer and the second magnetic pole, and in contact with the second magnetic pole;

[0351] a first non-magnetic layer disposed between the first magnetic pole and the first magnetic layer;

[0352] a second non-magnetic layer disposed between the first magnetic layer and the second magnetic layer;

[0353] a third non-magnetic layer disposed between the second magnetic layer and the third magnetic layer; and

[0354] a fourth non-magnetic layer disposed between the third magnetic layer and the fourth magnetic layer,

[0355] the first magnetic layer contains at least one selected from the group consisting of Fe, Co, and Ni,

[0356] the second magnetic layer contains at least one selected from the group consisting of Fe, Co, and Ni,

[0357] the third magnetic layer contains at least one selected from the group consisting of Fe, Co, and Ni,

[0358] the fourth magnetic layer contains at least one selected from the group consisting of Fe, Co, and Ni, and at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc,

[0359] the first non-magnetic layer contains at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag, or at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt, and W,

[0360] the second non-magnetic layer contains at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag,

[0361] the third non-magnetic layer contains at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt, and W,

[0362] the fourth non-magnetic layer contains at least one selected from the group consisting of Cu, Au, Cr, V, Al, and Ag.

[0363] (Technical Solution 23)

[0364] the magnetic recording device according to any one of Technical Solutions 10 to 22,

[0365] the direct current component has a direction from the first magnetic pole toward the second magnetic pole.

[0366] According to the embodiment, it is possible to provide a magnetic recording device capable of achieving an improvement in recording density.

[0367] In the present application specification, "perpendicular" and "parallel" are not only strict perpendicular and strict parallel, but also include, for example, a deviation in a manufacturing process or the like, as long as they are substantially perpendicular and substantially parallel.

[0368] The above describes embodiments of the application with reference to specific examples. However, the application is not limited to these specific examples. For example, as to the specific configurations of each element such as the magnetic pole, the magnetic element, the magnetic layer, the non-magnetic layer, and the control section included in the magnetic head and the magnetic recording device, as long as the application can be implemented and the same effects can be obtained by appropriately selecting from the known range by those skilled in the art, the application includes such configurations in the scope of the application.

[0369] Techniques obtained by combining two or more elements of the specific examples in a technically possible range also belong to the scope of the application as long as the gist of the application is included.

[0370] In addition, all magnetic recording devices that can be implemented by those skilled in the art based on the magnetic recording device described above as an embodiment of the application with appropriate design changes also belong to the scope of the application as long as the gist of the application is included.

[0371] In addition, within the scope of the idea of the application, various modifications and corrections can be conceived by those skilled in the art, and it should be understood that these modifications and corrections also belong to the scope of the application.

[0372] Although some embodiments of the application are described, these embodiments are presented as examples and are not intended to limit the scope of the application. These novel embodiments can be implemented in other various ways, and various omissions, substitutions, and changes can be made without departing from the scope of the gist of the application. These embodiments and modifications thereof belong to the scope, gist, and range of the application described in the claims, and the application and equivalents thereof.

Claims

1. A magnetic recording device, comprising: A magnetic head, comprising a first magnetic pole, a magnetic element, and a coil, wherein the magnetic element includes a first magnetic layer; and The control unit, electrically connected to the magnetic element and the coil, is capable of supplying recording current to the coil and element current to the magnetic element. The recorded current includes a first period of a first polarity, a second period of a second polarity different from the first polarity, a third period transitioning from the first period to the second period, and a fourth period transitioning from the second period back to the first period. The element current includes a direct current component and an alternating current component. The alternating magnetic field is generated from the magnetic element by the flow of the direct current component in the element current. The alternating current component in the first period is the same as the alternating current component in the second period, the third period, and the fourth period.

2. The magnetic recording device according to claim 1, The ratio of the amplitude of the AC component current to the absolute value of the DC component current is 0.1 or more.

3. The magnetic recording device according to claim 1, The ratio of the amplitude of the AC component current to the absolute value of the DC component current is 0.5 or more.

4. The magnetic recording device according to claim 1, The frequency of the AC component is above 0.2 GHz and below 7 GHz.

5. The magnetic recording device according to claim 1, The phase of the AC component is synchronized with the moment when the recording current becomes 0 in at least one of the third and fourth periods.

6. The magnetic recording device according to claim 1, The magnetic head also includes a second magnetic pole. The magnetic element is disposed between the first magnetic pole and the second magnetic pole.

7. The magnetic recording apparatus according to claim 6, The magnetic element also includes: A first non-magnetic layer is disposed between the first magnetic pole and the first magnetic layer; and A second non-magnetic layer is disposed between the first magnetic layer and the second magnetic pole. The first magnetic layer comprises at least one element selected from the group consisting of Fe, Co, and Ni. The first non-magnetic layer comprises at least one element selected from the group consisting of Cu, Au, Cr, V, Al, and Ag. The second nonmagnetic layer comprises at least one group selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt and W.

8. The magnetic recording apparatus according to claim 6, The magnetic element also includes: A second magnetic layer is disposed between the first magnetic layer and the second magnetic pole; A first non-magnetic layer is disposed between the first magnetic pole and the first magnetic layer; A second non-magnetic layer is disposed between the first magnetic layer and the second magnetic layer; and A third non-magnetic layer is disposed between the second magnetic layer and the second magnetic pole. The first magnetic layer comprises at least one element selected from the group consisting of Fe, Co, and Ni. The second magnetic layer comprises at least one element selected from the group consisting of Fe, Co, and Ni. The first non-magnetic layer comprises at least one element selected from the group consisting of Cu, Au, Cr, V, Al, and Ag, or at least one element selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt, and W. The second non-magnetic layer comprises at least one element selected from the group consisting of Cu, Au, Cr, V, Al, and Ag. The third nonmagnetic layer comprises at least one group selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt and W.

9. The magnetic recording apparatus according to claim 7, The DC component has an orientation from the first magnetic pole to the second magnetic pole.

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