Magnetic recording device and control method for magnetic recording device

Abstract

To provide a magnetic recording device and a control method thereof that enable stable operation. [Solution] The magnetic recording device 210 includes a magnetic recording medium 80, a magnetic head 110 for recording information on the magnetic recording medium, and a control unit 75 for controlling the magnetic recording medium and the magnetic head. The magnetic head includes a coil 30c, a first magnetic pole 31 that generates a magnetic field corresponding to the recording current Iw supplied to the coil, and a light emitting unit 77 that irradiates the magnetic recording medium with light to locally raise the temperature of the magnetic recording medium. The control unit performs a first operation OP1 and a second operation OP2. In the first operation, the control unit supplies a first current to the light emitting unit to emit a first light L1, causing the first magnetic pole 31 to record information on the magnetic recording medium. In the second operation, the control unit supplies a second current to the light emitting unit to emit a second light L2, changing the state of a contaminating member 88 attached to the magnetic head 110. The second current is greater than the first current.

Description

[Technical Field]

[0001] Embodiments of the present invention relate to a magnetic recording device and a control method for a magnetic recording device. [Background Art]

[0002] In a magnetic recording device, information is recorded on a magnetic recording medium such as an HDD (Hard Disk Drive) using a magnetic head. Stable operation is desired for a magnetic recording device. [Prior Art Literature] [Patent Literature]

[0003] [Patent Document 1] U.S. Pat. No. 9,911,446 Specification [Summary of the Invention] [Problem to be Solved by the Invention]

[0004] Embodiments of the present invention provide a magnetic recording device capable of stable operation and a control method for the magnetic recording device. [Means for Solving the Problem]

[0005] According to one embodiment, the magnetic recording apparatus includes a magnetic recording medium, a magnetic head configured to record information on the magnetic recording medium, and a control unit configured to control the magnetic recording medium and the magnetic head. The magnetic head includes a coil, a first magnetic pole configured to generate a magnetic field corresponding to a recording current supplied to the coil, and a light emitting unit configured to irradiate the magnetic recording medium with light to locally raise the temperature of the magnetic recording medium. The control unit is configured to perform a first operation and a second operation. In the first operation, the control unit is configured to supply a first current to the light emitting unit to emit a first light, causing the first magnetic pole to record information on the magnetic recording medium. In the second operation, the control unit is configured to supply a second current to the light emitting unit to emit a second light, changing the state of a contaminating member attached to the magnetic head. The second current is greater than the first current. [Brief explanation of the drawing]

[0006] [Figure 1] Figures 1(a) and 1(b) are schematic diagrams illustrating a magnetic recording device according to the first embodiment. [Figure 2] Figure 2 is a schematic plan view illustrating a magnetic recording device according to the first embodiment. [Figure 3] Figure 3 is a schematic diagram illustrating a magnetic recording device according to the first embodiment. [Figure 4] Figure 4 is a flowchart illustrating the operation of the magnetic recording device according to the first embodiment. [Figure 5] Figures 5(a) to 5(d) are schematic diagrams illustrating the operation of a magnetic recording device according to the first embodiment. [Figure 6] Figure 6 is a schematic perspective view illustrating a magnetic head and magnetic recording device according to an embodiment. [Figure 7] Figure 7 is a schematic perspective view illustrating a part of a magnetic recording apparatus according to an embodiment. [Figure 8] Figure 8 is a schematic perspective view illustrating a magnetic recording device according to an embodiment. [Figure 9]Figures 9(a) and 9(b) are schematic perspective views illustrating a part of a magnetic recording apparatus according to an embodiment. [Modes for carrying out the invention]

[0007] Embodiments of the present invention will be described below with reference to the drawings. Drawings are schematic or conceptual, and the relationships between the thickness and width of each part, as well as the ratios of the sizes of different parts, are not necessarily identical to those of reality. Even when representing the same part, the dimensions and ratios may be depicted differently in different drawings. In this specification and in each figure, elements similar to those described above are denoted by the same reference numerals with respect to previously shown figures, and detailed explanations are omitted as appropriate.

[0008] (First Embodiment) Figures 1(a) and 1(b) are schematic diagrams illustrating a magnetic recording device according to the first embodiment. Figure 2 is a schematic plan view illustrating a magnetic recording device according to the first embodiment. Figure 3 is a schematic diagram illustrating a magnetic recording device according to the first embodiment. As shown in Figure 1(a), the magnetic recording device 210 according to this embodiment includes a magnetic recording medium 80, a magnetic head 110, and a control unit 75. The magnetic head 110 is configured to record information on the magnetic recording medium 80. The control unit 75 is configured to control the magnetic recording medium 80 and the magnetic head 110.

[0009] The magnetic head 110 includes a coil 30c and a first magnetic pole 31. The first magnetic pole 31 generates a magnetic field (recording magnetic field) corresponding to the recording current Iw supplied to the coil 30c. The generated magnetic field is applied to the magnetic recording medium 80. This controls the orientation of the magnetization 83 of the magnetic recording medium 80. The state of the magnetization 83 corresponds to the information to be recorded. In this example, the magnetic head 110 further includes a second magnetic pole 32. The first magnetic pole 31 is, for example, a principal magnetic pole. The second magnetic pole 32 is, for example, a trailing shield. The magnetic recording medium 80 moves relative to the magnetic head 110 in the direction of the medium movement direction 85.

[0010] The magnetic head 110 further includes a light emission unit 77. The light emission unit 77 is configured to irradiate the magnetic recording medium 80 with light to locally increase the temperature of the magnetic recording medium 80.

[0011] For example, the light emission unit 77 includes a light source 77S and a light guide 77G. Light emitted from the light source 77S is guided by the light guide 77G. Light emitted from the light guide 77G is emitted to the magnetic recording medium 80 via, for example, an optical element or the like. The light source 77S is, for example, a laser.

[0012] Current (electric power) is supplied from the control unit 75 to the light source 77S. The current (electric power) is variable. Light having an intensity corresponding to the current (electric power) is emitted.

[0013] The control unit 75 is configured to perform a first operation OP1 and a second operation OP2. FIG. 1(a) corresponds to the first operation OP1. FIG. 1(b) corresponds to the second operation OP2.

[0014] As shown in FIG. 1(a), in the first operation OP1, the control unit 75 is configured to supply a first current I1 to the light emission unit 77 to cause the light emission unit 77 to emit first light L1, and cause the first magnetic pole 31 to record information on the magnetic recording medium 80. The first operation OP1 corresponds to a recording operation.

[0015] In the first operation OP1, the first light L1 locally irradiates the magnetic recording medium 80, so that the temperature of the magnetic recording medium 80 locally increases. This locally changes the recording characteristics of the magnetic recording medium 80, enabling efficient recording. The first operation OP1 corresponds to, for example, a heat-assisted recording operation.

[0016] As shown in FIG. 1(b), in the second operation OP2, the control unit 75 is configured to supply a second current I2 to the light emitting unit 77 to cause the second light L2 to be emitted, thereby changing the state of the contaminant member 88 attached to the magnetic head 110. The second current I2 is larger than the first current I1. For example, at least a portion of the contaminant member 88 may be removed by the second operation OP2. The second operation OP2 corresponds to, for example, a cleaning operation.

[0017] The intensity of the second light L2 in the second operation OP2 to which the second current I2 is supplied is higher than the intensity of the first light L1 in the first operation OP1. This changes the state of the contaminant member 88. For example, the hardness of the contaminant member 88 decreases. For example, the adhesive force of the contaminant member 88 decreases. For example, the shape of the contaminant member 88 changes. For example, a portion of the contaminant member 88 vaporizes. For example, at least a portion of the contaminant member 88 is removed.

[0018] When the first operation OP1 (recording operation) is performed with the contaminant member 88 attached, it becomes difficult for the target first light L1 to irradiate the magnetic recording medium 80. For example, the intensity of the first light L1 irradiated onto the magnetic recording medium 80 decreases. For example, the directivity of the first light L1 decreases, and the first light L1 is also incident on a region that is not the target position. For this reason, it becomes difficult to obtain a stable recording operation.

[0019] In the embodiment, the state of the contaminant member 88 is changed by the above-described second operation OP2. For example, at least a portion of the contaminant member 88 is removed. This enables a stable recording operation to be obtained. According to the embodiment, a magnetic recording apparatus capable of stable operation can be provided.

[0020] The contaminant member 88 may include a material contained in the magnetic recording medium 80. The contaminant member 88 may include a material derived from a material contained in the magnetic recording medium 80. For example, the magnetic recording medium 80 may include a magnetic recording layer 81 and a surface layer 81f. The surface layer 81f is provided on the magnetic recording layer 81. The surface layer 81f is, for example, a lubricant material layer. The contaminant member 88 may include, for example, a part of the material contained in the surface layer 81f.

[0021] For example, a contaminating member 88 is generated during the first operation OP1. For example, the generation of the contaminating member 88 is accelerated by the first light L1 irradiated onto the magnetic recording medium 80 during the first operation OP1.

[0022] In one example, the control unit 75 may be configured to periodically perform the second operation OP2. For example, a state in which there are few or no contaminating members 88 can be maintained.

[0023] In the second operation OP2, no information is recorded on the magnetic recording medium 80. The state of the magnetic head 110 in the second operation OP2 is different from the state of the magnetic head 110 in the first operation OP1 of the recording operation.

[0024] As shown in Figure 1(a), the distance between the magnetic recording medium 80 and the magnetic head 110 during the first operation OP1 is defined as the first distance d1. As shown in Figure 1(b), the distance between the magnetic recording medium 80 and the magnetic head 110 during the second operation OP2 is defined as the second distance d2. In one example, the second distance d2 is longer than the first distance d1. This suppresses the adverse effect of the second light L2 on the magnetic recording medium 80 during the second operation OP2.

[0025] As shown in Figure 2, the magnetic head 110 can face any position on the magnetic recording medium 80 by means of the arm 155. For example, the magnetic recording medium 80 includes a recording area 80R and a non-recording area 80N. As shown in Figure 1(a), in the first operation OP1, the magnetic head 110 faces the recording area 80R. In one example, as shown in Figure 1(b), in the second operation OP2, the magnetic head 110 faces the non-recording area 80N.

[0026] As shown in Figure 2, the magnetic head 110 has a ramp position RP. The ramp position RP is, for example, a standby position.

[0027] Figure 3 illustrates one state in the second operation OP2. As shown in Figure 3, in the second operation OP2, the magnetic head 110 may be in the Ramp position RP. In the Ramp position RP, vibration may be applied to the magnetic head 110. For example, the contaminating material 88 is effectively removed.

[0028] In one example, during the second operation OP2, the magnetic head 110 does not overlap with the recording area 80R of the magnetic recording medium 80 in a first direction D1 perpendicular to the recording surface 80F of the magnetic recording medium 80. This suppresses adverse effects on the magnetic recording medium 80 by the second light L2 during the second operation OP2.

[0029] In one example, the second current I2 may be 1.1 times or more and 2 times or less of the first current I1. When the second current I2 is 1.1 times or more of the first current I1, the state of the contaminating member 88 can be efficiently changed. When the second current I2 is 2 times or less of the first current I1, the degradation of the magnetic head 110's characteristics is suppressed.

[0030] Figure 4 is a flowchart illustrating the operation of the magnetic recording device according to the first embodiment. As shown in Figure 4, the control unit 75 performs the first operation OP1 (step S10) and the second operation OP2 (step S20).

[0031] The control unit 75 may determine whether the first condition is met (step S15). The control unit 75 is configured to perform the second operation OP2 if the first condition is met. If the first condition is not met, the first operation OP1 continues to be performed.

[0032] In one example, the first condition includes the time of the first action OP1 reaching a reference time.

[0033] In another example, the first condition includes the difference between the distance between the magnetic recording medium 80 and the magnetic head 110 and a reference distance exceeding a reference value. For example, if no contaminating member 88 is present, the distance between the magnetic recording medium 80 and the magnetic head 110 is short. For example, if a contaminating member 88 is present, the distance between the magnetic recording medium 80 and the magnetic head 110 will not be less than or equal to the thickness of the contaminating member 88. Based on the distance between the magnetic recording medium 80 and the magnetic head 110, the presence or absence of a contaminating member 88, or the amount of contaminating member 88, can be estimated.

[0034] As already explained, the control unit 75 may be configured to periodically perform the second operation OP2.

[0035] As shown in Figure 4, the control unit 75 may determine whether the second condition is met. If the second condition is not met, the second operation OP2 is continued. If the second condition is met, the second operation OP2 is terminated. In this case, the first operation OP1 can be performed. Thus, the control unit 75 may be configured to continue the second operation OP2 until the second condition is met.

[0036] In one example, the second condition includes the difference between the distance between the magnetic recording medium 80 and the magnetic head 110 and the reference distance being less than or equal to a reference value. For example, if the difference between the distance between the magnetic recording medium 80 and the magnetic head 110 and the reference distance becomes large, contaminating material 88 remains. The second operation OP2 may be continued until the amount of contaminating material 88 becomes less than the reference amount.

[0037] In another example, the second condition may include the execution time of the second action OP2 reaching a specified time. The second action OP2 may be terminated by the elapsed time.

[0038] The following describes an example of measuring the distance between the magnetic recording medium 80 and the magnetic head 110. In the following example, the distance between the magnetic recording medium 80 and the magnetic head 110 is controlled by the power supplied to the magnetic head 110.

[0039] Figures 5(a) to 5(d) are schematic diagrams illustrating the operation of a magnetic recording device according to the first embodiment. Figures 5(a) and 5(b) correspond to the state in which the contaminating member 88 is absent. The horizontal axis in Figure 5(b) is the power PW supplied to the magnetic head 110. The vertical axis in Figure 5(b) is the distance dz1 between the magnetic recording medium 80 and the magnetic head 110. The distance dz1 is the distance between the medium-facing surface 31F of the magnetic head 110 and the magnetic recording medium 80.

[0040] As shown in Figure 5(b), increasing the power PW reduces the distance dz1 due to thermal expansion of the magnetic head 110. As shown in Figure 5(b), when the power PW reaches the first power PW1, the decrease in distance dz1 saturates. The first power PW1 corresponds to a state in which the media-facing surface 31F and the magnetic recording medium 80 are in substantial contact. In this way, the distance dz1 can be measured by measuring the behavior related to the change in power PW.

[0041] Figures 5(c) and 5(d) correspond to the state in which the contaminating member 88 is present. The horizontal axis of Figure 5(d) is the power PW supplied to the magnetic head 110. The vertical axis of Figure 5(d) is the distance dz1 between the magnetic recording medium 80 and the magnetic head 110.

[0042] As shown in Figure 5(d), increasing the power PW reduces the distance dz1 due to thermal expansion of the magnetic head 110. As shown in Figure 5(d), when the power PW reaches the second power PW2, the decrease in distance dz1 saturates. The second power PW2 corresponds to a state where the medium-facing surface 31F and the contaminating member 88 are in substantial contact. The second power PW2 is smaller than the first power PW1.

[0043] By comparing the characteristics exemplified in Figure 5(b) with the characteristics exemplified in Figure 5(d), the thickness (amount) of the contaminating material 88 can be measured. By measuring the behavior with respect to changes in power PW, the distance dz1 when the contaminating material 88 is present can be measured.

[0044] Thus, the distance dz1 between the magnetic recording medium 80 and the magnetic head may vary based on the power PW supplied to the magnetic head 110. The distance dz1 between the magnetic recording medium 80 and the magnetic head 110 may be measured based on the rate of change of the power PW.

[0045] (Second Embodiment) The second embodiment relates to a control method for a magnetic recording device 210. The control method performs, for example, the process described with respect to Figure 4.

[0046] For example, a magnetic head 110 configured to record information on a magnetic recording medium 80 is made to perform a first operation OP1 and a second operation OP2. As already described, the magnetic head 110 includes a coil 30c, a first magnetic pole 31 configured to generate a magnetic field corresponding to the recording current Iw supplied to the coil 30c, and a light emitting unit 77 configured to irradiate the magnetic recording medium 80 with light to locally raise the temperature of the magnetic recording medium 80.

[0047] In the first operation OP1, a first current I1 is supplied to the light emission unit 77 to emit a first light L1, causing the first magnetic pole 31 to record information on the magnetic recording medium 80 (see Figure 1(a)). In the second operation OP2, a second current I2 is supplied to the light emission unit 77 to emit a second light L2, changing the state of the contaminating member 88 attached to the magnetic head 110 (see Figure 1(b)). The second current I2 is greater than the first current I1. According to this embodiment, a control method for a magnetic recording device that enables stable operation is provided.

[0048] The configuration described in the first embodiment may be applied to the second embodiment. For example, in the second operation OP2, at least a portion of the contaminating member 88 may be removed. For example, in the second operation OP2, the magnetic head 110 may be in the ramp position RP.

[0049] The following describes an example of the configuration of the magnetic head 110 and the magnetic recording device 210.

[0050] Figure 6 is a schematic perspective view illustrating a magnetic head and magnetic recording device according to an embodiment. In Figure 6, the light-emitting section 77 is omitted. As shown in Figure 6, the magnetic head according to the embodiment (for example, magnetic head 110) includes a regeneration unit 70. The regeneration unit 70 includes a first regeneration element 70a. The regeneration unit 70 may further include other regeneration elements. The magnetic head 110 is used together with a magnetic recording medium 80. The magnetic head 110 may include a recording unit 60. The recording unit 60 of the magnetic head 110 records information on the magnetic recording medium 80. The regeneration unit 70 regenerates the information recorded on the magnetic recording medium 80.

[0051] The magnetic recording medium 80 includes, for example, a media substrate 82 and a magnetic recording layer 81 provided on the media substrate 82. The magnetization 83 of the magnetic recording layer 81 is controlled by the recording unit 60. The recording unit 60 includes, for example, a first magnetic pole 31 and a second magnetic pole 32. The first magnetic pole 31 is, for example, a main magnetic pole. The second magnetic pole 32 is, for example, a trailing shield. The recording unit 60 may also include a recording unit element 33. The recording unit element 33 may include a magnetic field control element or a high-frequency oscillation element, etc. The recording unit element 33 may be omitted.

[0052] The first regeneration element 70a of the regeneration unit 70 includes, for example, a first regeneration shield 71, a second regeneration shield 72, and a regeneration element 73. The regeneration unit 70 is capable of outputting a signal corresponding to the magnetization 83 of the magnetic recording layer 81.

[0053] As shown in Figure 6, the magnetic recording medium 80 moves relative to the magnetic head 110 in the direction of the medium movement direction 85. The magnetic head 110 controls the information corresponding to the magnetization 83 of the magnetic recording layer 81 at any position. The magnetic head 110 reproduces the information corresponding to the magnetization 83 of the magnetic recording layer 81 at any position.

[0054] For example, the direction of the media movement direction 85 is from the first regeneration shield 71 to the second regeneration shield 72. For example, the magnetic recording medium 80 includes one first recording area. After the first recording area faces the first regeneration shield 71, the first recording area faces the second regeneration shield 72.

[0055] Figure 7 is a schematic perspective view illustrating a part of a magnetic recording apparatus according to an embodiment. Figure 7 illustrates a head slider. The magnetic head 110 is mounted on a head slider 159. The head slider 159 includes, for example, Al2O3 / TiC. The head slider 159 moves relative to the magnetic recording medium, either floating above or in contact with it.

[0056] The head slider 159 has, for example, an air inlet side 159A and an air outlet side 159B. The magnetic head 110 is positioned on the side of the air outlet side 159B of the head slider 159. As a result, the magnetic head 110 moves relative to the magnetic recording medium while floating above or in contact with it.

[0057] Figure 8 is a schematic perspective view illustrating a magnetic recording device according to an embodiment. Figures 9(a) and 9(b) are schematic perspective views illustrating a part of a magnetic recording apparatus according to an embodiment. The magnetic recording device may be a magnetic recording and playback device. As shown in Figure 8, a rotary actuator is used in the magnetic recording device 150 according to this embodiment. The recording medium disk 180 is mounted on a spindle motor 180M. The recording medium disk 180 rotates in the direction of arrow AR by the spindle motor 180M. The spindle motor 180M responds to a control signal from the drive unit control. The magnetic recording device 150 according to this 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, an SSD (Solid State Drive). For example, a non-volatile memory such as flash memory is used for the recording medium 181. For example, the magnetic recording device 150 may be a hybrid HDD (Hard Disk Drive).

[0058] The head slider 159 records and plays back information to be recorded on the recording medium disk 180. The head slider 159 is located at the tip of a thin-film suspension 154. A magnetic head according to this embodiment is located near the tip of the head slider 159.

[0059] As the recording medium disk 180 rotates, the pressing pressure from the suspension 154 and the pressure generated on the media-facing surface (ABS) of the head slider 159 are balanced. The distance between the media-facing surface of the head slider 159 and the surface of the recording medium disk 180 becomes a predetermined amount of levitation. In this embodiment, the head slider 159 may be in contact with the recording medium disk 180. For example, a contact-running type may be applied.

[0060] The suspension 154 is connected to one end of an arm 155 (for example, an actuator arm). The arm 155 has, for example, a bobbin section. The bobbin section 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 section 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.

[0061] The arm 155 is held by ball bearings. Ball bearings are provided at two locations, above and below the bearing portion 157. The arm 155 can rotate and slide by a voice coil motor 156. The magnetic head can move to any position on the recording medium disk 180.

[0062] Figure 9(a) illustrates a part of the configuration of a magnetic recording device and is an enlarged perspective view of the head stack assembly 160. Figure 9(b) is a perspective view illustrating a magnetic head assembly (head gimbal assembly: HGA) 158, which is part of the head stack assembly 160.

[0063] As shown in Figure 9(a), the head stack assembly 160 includes a bearing section 157, a head gimbal assembly 158, and a support frame 161. The head gimbal assembly 158 extends from the bearing section 157. The support frame 161 extends from the bearing section 157. The direction in which the support frame 161 extends is opposite to the direction in which the head gimbal assembly 158 extends. The support frame 161 supports the coil 162 of the voice coil motor 156.

[0064] As shown in Figure 9(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.

[0065] A head slider 159 is provided at the tip of the suspension 154. A magnetic head according to the embodiment is provided on the head slider 159.

[0066] The magnetic head assembly (head gimbal assembly) 158 according to the embodiment includes a magnetic head according to the embodiment, a head slider 159 on which the magnetic head is provided, 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.

[0067] The suspension 154 may have, for example, lead wires (not shown) for recording and reproducing signals. The suspension 154 may also have, for example, lead wires (not shown) for heaters for adjusting the amount of levitation. The suspension 154 may also have, for example, lead wires (not shown) for an oscillator or the like. These lead wires are electrically connected to a plurality of electrodes provided on the magnetic head.

[0068] A signal processing unit 190 is provided in the magnetic recording device 150. The signal processing unit 190 records and reproduces signals on a magnetic recording medium using a magnetic head. The input and output lines of the signal processing unit 190 are connected, for example, to the electrode pads of the head gimbal assembly 158 and are electrically connected to the magnetic head.

[0069] The magnetic recording apparatus 150 according to the embodiment includes a magnetic recording medium, a magnetic head according to the embodiment, a movable part, a position control unit, and a signal processing unit. The movable part allows the magnetic recording medium and the magnetic head to move relative to each other while separated or in contact. The position control unit aligns the magnetic head to 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.

[0070] For example, a recording medium disk 180 is used as the magnetic recording medium. The movable part includes, for example, a head slider 159. The position control unit includes, for example, a head gimbal assembly 158.

[0071] The embodiments may include the following technical proposals. (Technical proposal 1) Magnetic recording medium and A magnetic head configured to record information on the magnetic recording medium, A control unit configured to control the magnetic recording medium and the magnetic head, Equipped with, The aforementioned magnetic head is Coil and, A first magnetic pole configured to generate a magnetic field corresponding to the recording current supplied to the coil, A light emitting unit configured to irradiate the magnetic recording medium with light to locally raise the temperature of the magnetic recording medium, Includes, The control unit is configured to perform the first and second operations. In the first operation, the control unit is configured to supply a first current to the light emission unit to emit a first light, causing the first magnetic pole to record information on the magnetic recording medium. In the second operation described above, the control unit is configured to supply a second current to the light emission unit to emit a second light, thereby changing the state of the contaminating material attached to the magnetic head. A magnetic recording device in which the second current is greater than the first current.

[0072] (Technical proposal 2) The magnetic recording apparatus according to Technical Proposal 1, wherein at least a portion of the contaminating member is removed in the second operation.

[0073] (Technical proposal 3) The magnetic recording apparatus according to Technical Proposal 1, wherein the shape of the contaminating member changes during the second operation.

[0074] (Technical proposal 4) A magnetic recording device according to any one of Technical Proposals 1 to 3, wherein no information is recorded on the magnetic recording medium in the second operation.

[0075] (Technical proposal 5) A magnetic recording device according to any one of Technical Proposals 1 to 4, wherein the contaminating member is generated in the first operation.

[0076] (Technical proposal 6) In the second operation, the magnetic head does not overlap with the recording area of ​​the magnetic recording medium in a first direction perpendicular to the recording surface of the magnetic recording medium, as described in any one of Technical Proposals 1 to 5.

[0077] (Technical proposal 7) In the second operation, the magnetic head is in the Ramp position, as described in any one of Technical Proposals 1 to 5.

[0078] (Technical proposal 8) A magnetic recording apparatus according to any one of Technical Proposals 1 to 5, wherein the second distance between the magnetic recording medium and the magnetic head in the second operation is longer than the first distance between the magnetic recording medium and the magnetic head in the first operation.

[0079] (Technical proposal 9) The magnetic recording medium includes a recording area and a non-recording area. In the first operation, the magnetic head faces the recording area, In the second operation, the magnetic head is a magnetic recording device according to any one of Technical Proposals 1 to 5, facing the non-recording area.

[0080] (Technical proposal 10) The control unit is configured to perform the second operation when the first condition is met. The magnetic recording apparatus according to any one of Technical Proposals 1 to 9, wherein the first condition includes the time of the first operation reaching a reference time.

[0081] (Technical proposal 11) The control unit is configured to perform the second operation when the first condition is met. The magnetic recording apparatus according to any one of Technical Proposals 1 to 9, wherein the first condition includes the difference between the distance between the magnetic recording medium and the magnetic head and the reference distance exceeds a reference value.

[0082] (Technical proposal 12) The control unit is configured to periodically perform the second operation, as described in any one of Technical Proposals 1 to 9, for the magnetic recording apparatus.

[0083] (Technical proposal 13) The control unit is configured to continue the second operation until the second condition is met. The magnetic recording apparatus according to any one of Technical Proposals 1 to 9, wherein the second condition includes the difference between the distance between the magnetic recording medium and the magnetic head and the reference distance being less than or equal to a reference value.

[0084] (Technical proposal 14) The control unit is configured to continue the second operation until the second condition is met. The magnetic recording device according to any one of Technical Proposals 1 to 9, wherein the second condition includes the time required to perform the second operation reaching a specified time.

[0085] (Technical proposal 15) The magnetic recording device according to any one of Technical Proposals 1 to 14, wherein the second current is 1.1 times or more and 2 times or less the first current.

[0086] (Technical proposal 16) The distance between the magnetic recording medium and the magnetic head changes based on the power supplied to the magnetic head. The magnetic recording apparatus according to proposal 11 or 13, wherein the distance between the magnetic recording medium and the magnetic head is measured based on the rate of change of the power.

[0087] (Technical proposal 17) The magnetic recording apparatus according to any one of Technical Proposals 1 to 16, wherein the contaminating member includes a material contained in the magnetic recording medium.

[0088] (Technical proposal 18) A magnetic head configured to record information on a magnetic recording medium is made to perform a first operation and a second operation, the magnetic head including a coil, a first magnetic pole configured to generate a magnetic field corresponding to the recording current supplied to the coil, and a light emitting unit configured to irradiate the magnetic recording medium with light to locally raise the temperature of the magnetic recording medium, In the first operation, a first current is supplied to the light emission unit to emit first light, causing the first magnetic pole to record information on the magnetic recording medium. In the second operation described above, a second current is supplied to the light emission unit to emit a second light, thereby changing the state of the contaminating material attached to the magnetic head. A control method for a magnetic recording device, wherein the second current is greater than the first current.

[0089] (Technical proposal 19) A control method for a magnetic recording apparatus according to Technical Proposal 18, wherein in the second operation, at least a portion of the contaminating member is removed.

[0090] (Technical proposal 20) A control method for a magnetic recording apparatus according to Technical Proposal 18 or 19, wherein in the second operation, the magnetic head is in the Ramp position.

[0091] According to the embodiment, a magnetic recording apparatus capable of improving productivity and a method for manufacturing the same can be provided.

[0092] In this specification, "perpendicular" and "parallel" do not mean strictly perpendicular and strictly parallel, but also include variations in the manufacturing process, for example, and it is sufficient if they are substantially perpendicular and substantially parallel.

[0093] The embodiments of the present invention have been described above with reference to specific examples. However, the present invention is not limited to these specific examples. For example, the specific configuration of each element included in a magnetic recording device, such as a magnetic recording medium, a magnetic head, and a control unit, is included within the scope of the present invention as long as it can be implemented in the same way and similar effects can be obtained by appropriately selecting from the range known to those skilled in the art.

[0094] Combinations of two or more elements from any of the specific examples, to the extent technically feasible, are also included within the scope of the present invention, insofar as they encompass the gist of the invention.

[0095] Furthermore, all magnetic recording devices and methods for manufacturing magnetic recording devices that can be implemented by those skilled in the art by appropriately modifying the design based on the magnetic recording device and method for manufacturing a magnetic recording device described above as embodiments of the present invention also fall within the scope of the present invention, insofar as they encompass the gist of the present invention.

[0096] Furthermore, within the scope of the concept of the present invention, a person skilled in the art could conceive of various modifications and alterations, and it is understood that such modifications and alterations also fall within the scope of the present invention.

[0097] While several embodiments of the present invention have been described, these embodiments are presented as examples only and are not intended to limit the scope of the invention. These novel embodiments can be carried out in a variety of other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims of the invention and its equivalents. [Explanation of Symbols]

[0098] 30c: coil, 31, 32: first and second magnetic poles, 31F: media-facing surface, 33: recording element, 60: recording section, 70: playback section, 70a: first playback element, 71, 72: first and second playback shields, 73: playback element, 75: control unit, 77: light emission section, 77G: optical guide, 77S: light source, 80: magnetic recording medium, 80F: recording surface, 80N: non-recording area, 80R: recording area, 81: magnetic recording layer, 81f: surface layer, 82: media substrate, 83: magnetization, 85: media movement direction, 88: contamination member, 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 outlet 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, I1, I2: First, second current, Iw: Recording current, L1, L2: First, second light, OP1, OP2: First, second operation, PW: Power, PW1, PW2: First, second power, RP: Ramp position, d1, d2: First, second distance, dz1: Distance

Claims

1. Magnetic recording medium and A magnetic head configured to record information on the magnetic recording medium, A control unit configured to control the magnetic recording medium and the magnetic head, Equipped with, The aforementioned magnetic head is Coil and, A first magnetic pole configured to generate a magnetic field corresponding to the recording current supplied to the coil, A light emitting unit configured to irradiate the magnetic recording medium with light to locally raise the temperature of the magnetic recording medium, Includes, The control unit is configured to perform the first and second operations. In the first operation, the control unit is configured to supply a first current to the light emission unit to emit a first light, causing the first magnetic pole to record information on the magnetic recording medium. In the second operation described above, the control unit is configured to supply a second current to the light emission unit to emit a second light, thereby changing the state of the contaminating material attached to the magnetic head. A magnetic recording device in which the second current is greater than the first current.

2. The magnetic recording apparatus according to claim 1, wherein in the second operation, at least a portion of the contaminating member is removed.

3. The magnetic recording apparatus according to claim 1 or 2, wherein in the second operation, the magnetic head does not overlap with the recording area of ​​the magnetic recording medium in a first direction perpendicular to the recording surface of the magnetic recording medium.

4. In the second operation, the magnetic head is in the Ramp position, according to claim 1 or 2, the magnetic recording apparatus.

5. The magnetic recording apparatus according to claim 1 or 2, wherein the second distance between the magnetic recording medium and the magnetic head in the second operation is longer than the first distance between the magnetic recording medium and the magnetic head in the first operation.

6. The magnetic recording medium includes a recording area and a non-recording area. In the first operation, the magnetic head faces the recording area, In the second operation, the magnetic head faces the non-recording area, as described in claim 1 or 2.

7. The control unit is configured to perform the second operation when the first condition is met. The magnetic recording apparatus according to claim 1 or 2, wherein the first condition includes the time of the first operation reaching a reference time.

8. The control unit is configured to perform the second operation when the first condition is met. The magnetic recording apparatus according to claim 1 or 2, wherein the first condition includes the difference between the distance between the magnetic recording medium and the magnetic head and the reference distance exceeds a reference value.

9. The control unit is configured to continue the second operation until the second condition is met. The magnetic recording apparatus according to claim 1 or 2, wherein the second condition includes the difference between the distance between the magnetic recording medium and the magnetic head and the reference distance being less than or equal to a reference value.

10. A magnetic head configured to record information on a magnetic recording medium is made to perform a first operation and a second operation, and the magnetic head includes a coil, a first magnetic pole configured to generate a magnetic field corresponding to the recording current supplied to the coil, and a light emitting unit configured to irradiate the magnetic recording medium with light to locally raise the temperature of the magnetic recording medium. In the first operation, a first current is supplied to the light emission unit to emit first light, causing the first magnetic pole to record information on the magnetic recording medium. In the second operation described above, a second current is supplied to the light emission unit to emit a second light, thereby changing the state of the contaminating material attached to the magnetic head. A control method for a magnetic recording device, wherein the second current is greater than the first current.

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