Magnetic recording / reproducing apparatus and control method for magnetic recording / reproducing apparatus

Abstract

The invention provides a magnetic recording and reproducing device and a control method of the magnetic recording and reproducing device, which can shorten the time required for forming a lubricant filling area along with the fluctuation of the floating amount of a heat-assisted magnetic recording head. A control method of a magnetic recording and reproducing apparatus according to an embodiment includes recording by a heat-assisted magnetic recording head at a head float amount of a first height, changing the head float amount to a second height higher than the first height, operating the heat-assisted magnetic recording head, filling a lubricant between the heat-assisted magnetic recording head and a recording surface, and reproducing the heat-assisted magnetic recording head. A lubricant filling region having a second height is formed.

Description

[0001] This application claims the priority of Japanese Patent Application No. 2023-152174 (filing date: September 20, 2023) as a basic application. The present application incorporates the entire contents of the basic application by reference. Technical Field

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

[0003] In a heat-assisted magnetic recording head, recording is performed by increasing the temperature of a magnetic disk using laser light. It is known that due to the temperature increase, components of the magnetic film of the magnetic disk adhere to the tip of the near field optical element (NFT) through the lubricant and form a solid.

[0004] From the recording principle, it is impossible to prevent the generation of the lubricant solidified material. On the other hand, it is known that when the lubricant solidified material is fixed, the transmittance of the laser beam is improved, and it functions as a layer that improves the transmission efficiency of the laser beam.

[0005] If the floating amount is reduced, the lubricant solidification will be reduced due to wear, and if the floating amount is increased, the lubricant solidification will be rebuilt by filling the lubricant between the head and the medium. Therefore, when the floating amount in the disk surface changes, for example, when the thermally assisted magnetic recording head moves from a track with low floating to a track with high floating, the problem of recording performance degradation occurs until the solidification is generated. Summary of the invention

[0006] Embodiments of the present invention provide a magnetic recording and reproducing device and a control method of the magnetic recording and reproducing device that shorten the time required to form a lubricant filling region accompanying fluctuations in the floating amount of a thermally assisted magnetic recording head.

[0007] The control method of the magnetic recording and reproducing device involved in the present embodiment is a control method of the magnetic recording and reproducing device having a thermally assisted magnetic recording head and a thermally assisted magnetic recording medium with a lubricant provided on the recording surface, comprising: after recording is performed by the thermally assisted magnetic recording head at a head floating amount of a first height, the head floating amount is changed to a second height higher than the first height, the thermally assisted magnetic recording head is operated, and the lubricant is filled between the thermally assisted magnetic recording head and the recording surface to form a lubricant filling area of ​​the second height. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a block diagram showing the structure of an example of the magnetic recording and reproducing device according to the first embodiment.

[0009] Figure 2This is a part of an exploded perspective view of the magnetic recording and reproducing device according to the first embodiment.

[0010] Figure 3 It is a side view showing the magnetic head 10 and a suspension.

[0011] Figure 4 It is a cross-sectional view of a part of the magnetic recording and reproducing device according to the first embodiment.

[0012] Figure 5 This is a flowchart showing a control method of the magnetic recording and reproducing device according to the first embodiment.

[0013] Figure 6 This is a model diagram showing the formation process of the lubricant filling area.

[0014] Figure 7 This is a model diagram showing the formation process of the lubricant filling area.

[0015] Figure 8 This is a model diagram showing the formation process of the lubricant filling area.

[0016] Fig. 9 This is a block diagram showing another example of an MPU that can be used in the magnetic recording and reproducing device according to the first embodiment.

[0017] Fig.10 This is a flowchart showing another example of the control method of the magnetic recording and reproducing device according to the first embodiment.

[0018] Fig.11 This is a graph showing changes in BER with respect to time in Example 1.

[0019] Description of symbols

[0020] 1 magnetic recording medium (disk); 1a recording surface; 10, 10W, 10R thermally assisted magnetic recording head; 29 lubricant filling area; 19-1 floating amount control unit; 19-2 filling action control unit; 200 magnetic recording and reproducing device. DETAILED DESCRIPTION

[0021] Hereinafter, embodiments will be described with reference to the drawings.

[0022] In addition, the disclosure is only an example, and the contents that can be easily thought of by those skilled in the art while maintaining the main idea of ​​the invention are certainly included in the scope of the present invention. In addition, in order to make the description clearer, the drawings sometimes schematically show the width, thickness, shape, etc. of each part compared with the actual form, but it is always just an example and does not limit the interpretation of the present invention. In addition, in this specification and each figure, the same elements as those described previously with respect to the figures that have appeared are marked with the same figure numbers, and the detailed description is sometimes appropriately omitted.

[0023] Example

[0024] Hereinafter, examples will be shown and the implementation will be described in detail.

[0025] First, refer to Figure 1 , the structure of an example of a disk drive involved in the first embodiment is described. In addition, Figure 1 The structure of the disk drive as a magnetic recording and reproducing device shown above is also applicable to each embodiment described later.

[0026] like Figure 1 As shown, the disk drive 200 is a magnetic recording and reproducing device of a perpendicular magnetic recording method in which a magnetic disk 1 as a perpendicular magnetic recording medium and a magnetic head 10 having a magnetic flux control layer described later are incorporated.

[0027] Figure 2 This is a part of an exploded perspective view of the magnetic recording and reproducing device according to the first embodiment.

[0028] Figure 2 In the magnetic recording and reproducing device according to the first embodiment, a state is shown in which a plurality of magnetic disks 1 and a plurality of magnetic heads 10 are accommodated in a housing 51, and a cover portion is omitted.

[0029] The magnetic disk 1 is mounted to be fixed to the spindle motor (SPM) 2 and rotates. The magnetic head 10 is mounted on the actuator 3 and is configured to move in the radial direction on the magnetic disk 1. The actuator 3 is driven to rotate by the voice coil motor (VCM) 4. The magnetic head 10 includes a write head (recording head) 10W, a read head (reproduction head) 10R, and a thermal assist unit 100. The write head 10W writes data to the magnetic disk 1. The read head 10R reads data from the magnetic disk 1. The thermal assist unit 100 assists in writing data when the write head 10W writes data to the magnetic disk 1. The magnetic head 10 may include a single head or a plurality of heads.

[0030] The disk drive includes a head amplifier integrated circuit (hereinafter referred to as a head amplifier IC) 11, a read / write channel (R / W channel) 12, a hard disk controller (HDC) 13, a microprocessor (MPU) 14, a driver IC 16, and a memory 17. The R / W channel 12, the HDC 13, and the MPU 14 are assembled into a controller 15 formed of an integrated circuit of a single chip.

[0031] As described later, the head amplifier IC11 includes a circuit group for driving a laser diode for thermal assistance. In addition, the head amplifier IC11 includes a driver for supplying a recording signal (write current) corresponding to write data supplied from the R / W channel 12 to the recording head 10W. In addition, the head amplifier IC11 includes a read amplifier for amplifying a read signal output from the reproduction head 10R and transmitting it to the R / W channel 12.

[0032] The R / W channel 12 is a signal processing circuit for reading / writing data. The HDC 13 constitutes an interface between the disk drive and the host 18, and performs transmission control of read / write data.

[0033] The MPU 14 is a main control unit of the disk drive, and performs control of the read / write action and servo control required for positioning the magnetic head 10. Furthermore, the MPU 14 includes a floating amount control unit 19-1, which controls the head floating amount to change to a second height higher than the first height after recording is performed by the write head 10W for thermally assisted magnetic recording at a head floating amount of the first height, and a filling action control unit 19-2, which controls the filling action of the lubricant between the write head 10W and the recording surface 1a using the write head 10W for thermally assisted magnetic recording, to form a lubricant filling area having a second height.

[0034] The memory 17 includes a buffer memory formed of a DRAM, a flash memory, etc. In addition, it may include a system area of ​​a magnetic recording medium.

[0035] Figure 3 It is a side view showing the magnetic head 10 and the suspension.

[0036] like Figure 3 As shown in FIG. 1 , each magnetic head 10 is configured as a floating type magnetic head, and includes a slider 42 of a substantially rectangular parallelepiped shape and a head 44 for recording and reproducing provided at the outflow end (trailing end) of the slider 42. The magnetic head 10 is fixed to a universal joint spring 41 provided at the front end of the suspension 34. Due to the elasticity of the suspension 34, a head load L is applied to each magnetic head 10 toward the surface of the magnetic disk 1. Figure 2 As shown, each magnetic head 10 is connected to the head amplifier IC 11 and the HDC 13 via a suspension 34 and a wiring member (flexure) 35 fixed to an arm.

[0037] Next, the configurations of the magnetic disk 1 and the magnetic head 10 will be described in detail.

[0038] Figure 4 It is a cross-sectional view of a write head 10W and a magnetic disk 1 which are parts of a magnetic recording and reproducing device.

[0039] The magnetic disk 1 has a substrate 20, a heat sink layer 21, a crystal orientation layer 22, a perpendicular recording layer 23, and a protective film 24 with a lubricant applied on the surface, which are sequentially stacked on the substrate 20. The perpendicular recording layer 23 has a large anisotropy in a direction perpendicular to the disk surface. The crystal orientation layer 22 is arranged below the perpendicular recording layer 23 to improve the orientation of the perpendicular recording layer 23. The heat sink layer 21 is arranged below the crystal orientation layer 22 to suppress the expansion of the heating area. The protective film 24 is arranged on the upper part of the perpendicular recording layer 23 to protect the perpendicular recording layer 23.

[0040] The magnetic head 10 is a separate type magnetic head including a recording head 10W and a reproducing head 10R. The recording head 10W is composed of a main magnetic pole 40, a trailing yoke 50, a return shield 51, and a magnetic pole 52. The main magnetic pole 40 generates a vertical magnetic field perpendicular to the disk surface and is formed of a high magnetic permeability material. The trailing yoke 50 allows the main magnetic pole 40 to flow magnetic flux and is magnetically coupled with the main magnetic pole. The return shield magnetic pole 60 is arranged on the leading side of the main magnetic pole 40 and is provided to efficiently close the magnetic circuit directly below the main magnetic pole. The coil 70 is arranged in a manner of winding around the magnetic circuit including the trailing yoke and the return shield magnetic pole in order to allow the main magnetic pole 40 to flow magnetic flux. The heater 80 is used to control the floating height of the recording head. The near-field optical element 30 generates near-field light for heating the perpendicular recording layer 23 of the magnetic recording medium 1 on the leading side of the main magnetic pole 40. The waveguide 31 is used to propagate light for generating near-field light. The light source is assembled in the form of a laser diode 32 mounted on a slider of the actuator assembly 3. For example, Au, Pd, Pt, Rh, or Ir, or an alloy formed by a combination of several of them can be used as the near field optical element 30. For example, an oxide formed of SiO2, Al2O3, etc. can be used as the insulating layer provided between the main magnetic pole and the near field optical element.

[0041] As recording methods that can be used for heat-assisted magnetic recording in the magnetic recording and reproducing device 200, there can be cited a conventional recording method in which tracks are written at intervals in the radial direction and recorded in a manner that adjacent tracks do not overlap, namely the so-called CMR (Conventional Magnetic Recording), a shingled recording method in which tracks overlap sequentially in the radial direction and are recorded in an overlapping manner on a portion of adjacent tracks, namely the so-called SMR (Shingled Magnetic Recording), or an interlaced recording method in which bottom tracks and top tracks overlap adjacent tracks unequally and, after recording on the bottom track, are recorded on an interlaced top track in an overlapping manner with the bottom track, namely the so-called IMR (Interlaced Magnetic Recording), or a combination thereof.

[0042] Magnetic recording and reproducing device 200 can contain oxygen in a ratio of more than 1 volume % and less than 20 volume %. If oxygen is lower than 1 volume %, there is a tendency that the deposits attached to the head increase and the contact probability between the head and the medium rise, and if oxygen exceeds 20 volume %, there is a tendency that the head positioning accuracy cannot meet the desired level.

[0043] Figure 5 This is a flowchart showing a control method of the magnetic recording and reproducing device according to the first embodiment.

[0044] Figure 6 , Figure 7 and Figure 8 Each of them is a model diagram showing a formation process of a lubricant filling region of a thermally assisted magnetic recording head.

[0045] like Figure 5 and Figure 6 As shown, first, the thermally assisted magnetic recording head 10 having the NFT 30 and the main magnetic pole 40 at the front end seeks on the magnetic disk 1 having the magnetic recording layer 23, the protective layer 24, and the lubricant layer 25 coated on the protective layer 24 at the head floating amount of the first height H1, and the magnetic recording operation (ST1) based on the thermally assisted magnetic recording head 10 is performed at the head floating amount of the first height H1. As a result, the lubricant filled from the lubricant layer 25 to the front end of the NFT 30 is solidified, and the lubricant solidified material 26 having the first height H1 may be attached to the thermally assisted magnetic recording head 10.

[0046] Next, for example, a track dedicated to dummy writing is prepared as a track for operating the thermally assisted magnetic recording head during the lubricant filling operation, and the head floating amount is changed to a second height H2 (ST2) higher than the first height H1 by the floating amount control unit 19-1. Figure 7As shown, by increasing the flying height to the second height H2 , the distance between the thermally assisted magnetic recording head 10 and the recording surface 1 a of the magnetic recording medium 1 is increased, thereby forming a gap 27 between the lubricant solidified material 26 at the tip of the NFT 30 and the magnetic recording medium 1 .

[0047] Then, the filling operation control unit 19-2 operates the thermally assisted magnetic recording head 10 to perform a filling operation of the lubricant between the lubricant solidified material 26 and the recording surface 1a (ST3). As a filling operation of the lubricant, first, the thermally assisted magnetic recording head 10 seeks on the magnetic track for dummy writing, and the lubricant is filled from the lubricant layer 25 to the gap 27 by using surface tension. Then, by irradiating the magnetic recording with a laser in this state, the lubricant around the lubricant solidified material 26 filled in the front end of the NFT 30 can be solidified to form a lubricant solidified material 28. Thus, as Figure 8 As shown, the thermally assisted magnetic recording head 10 can be provided with a lubricant filling region 29 including the lubricant solidified material 26 and the lubricant solidified material 28 and having a second height.

[0048] Thus, according to the implementation mode, the head floating amount can be increased after the magnetic recording action is completed, and a lubricant filling area can be set in advance on the head. Therefore, even when there is a difference in the head floating amount in each track, the time required for lubricant filling accompanying the change in the floating amount, that is, the time during which the recording performance decreases, can be shortened as much as possible, and magnetic recording can be performed without reducing the recording performance.

[0049] In addition, instead of preparing a track for dummy writing, the same track as the track on which the thermally assisted magnetic recording was last performed is used as the track for operating the thermally assisted magnetic recording head during the lubricant filling operation. The same effect can be obtained by increasing the floating amount to the second height and drawing the same pattern.

[0050] The lubricant filling operation by the thermally assisted magnetic recording head includes, for example, performing magnetic recording while performing laser irradiation by thermally assisted magnetic recording operation after performing seek operation by the thermally assisted magnetic recording head, or performing seek operation by the thermally assisted magnetic recording head without performing laser irradiation by thermally assisted magnetic recording operation.

[0051] If magnetic recording is performed while laser irradiation is performed, the lubricant filling area 29 may become Figure 8The lubricant solidified material as shown. If only the heat-assisted magnetic recording head is sought, the lubricant filling area 29 may include the lubricant solidified material and the uncured or insufficiently cured lubricant. Even if laser irradiation is not performed, the lubricant can be attached to the front end of the NFT by only changing the floating amount for seeking. In this case, there is no temperature rise caused by the near-field light, and correspondingly no curing will occur, but when the floating height changes during the next magnetic recording, the time for filling the lubricant can be shortened, thereby shortening the time for recording performance to decline.

[0052] The timing of filling the lubricant can be determined by the following settings: once at a certain time, after passing a registered position when there is a defect such as a protrusion on the medium, or when the idle state continues for more than a certain time.

[0053] The following methods can be adopted to change the floating amount.

[0054] First, in order to cope with sudden floating changes, a method of uniformly increasing a certain value can be used. A floating amount table for each area, a defect map that registers the locations of defects such as protrusions on the magnetic recording medium, and a floating amount adjustment table for determining the adjustment value of each area can be stored in advance in the system area of ​​the magnetic recording medium. For example, based on the floating amount table of each area, the difference in floating amount between the area being written and the area to be written next can be calculated to determine the adjustment value.

[0055] Fig. 9 This is a block diagram showing another example of an MPU that can be used in the magnetic recording and reproducing device according to the first embodiment.

[0056] Fig. 9 Can be applied to Figure 1 The magnetic recording and reproducing device has the same Figure 1 Same composition.

[0057] As shown in the figure, the MPU 14-1 has: a detection unit 67, which detects a set value for determining the filling action of the lubricant; a filling action calculation unit 66, which calculates the filling action of the lubricant based on the detection result; a filling action control unit 19-2, which receives the result of the filling action calculation unit 66, operates the write head 10W for thermally assisted magnetic recording, and controls the filling action of the lubricant between the write head 10W and the recording surface 1a within a predetermined time, for example, by only performing seek, or irradiating laser and recording, so as to form a lubricant filling area with a second height; a timing determination unit 19-3, which determines at what timing to fill the lubricant; and a floating amount calculation unit 63, which determines the floating amount of the head at the first height by the thermal assisted magnetic recording head 10W. After the write head 10W for auxiliary magnetic recording has recorded, the floating amount in the zone where the write head 10W performs the next recording is calculated; a decision unit 64, which receives the calculation result and determines the head floating amount; an indication unit 65, which receives the decision result from the decision unit 64 and indicates a change in the head floating amount; a floating amount control unit 19-1, which receives an indication from the indication unit 65 and controls the head floating amount to change it to a second height higher than the first height; and a main control unit 61, which is connected to the floating amount control unit 19-1, the filling action control unit 19-2, the timing determination unit 19-3, the floating amount calculation unit 63, the decision unit 64, the indication unit 65, the filling action calculation unit 66 and the detection unit 67, and controls the whole.

[0058] Fig.10 This is a flowchart showing another example of the control method of the magnetic recording and reproducing device according to the first embodiment.

[0059] As shown in the figure, in another example of the control method of the magnetic recording and reproducing device involved in the first embodiment, first, the setting value for determining the filling action of the lubricant is detected by the detection unit 67. The filling action calculation unit 66 calculates the filling action of the lubricant according to the setting value. The filling action control unit 19-2 receives the calculation result and sets the filling action of the lubricant between the write head 10W and the recording surface 1a (ST11). The setting value may include parameters for determining the filling action and the filling time, etc., which can be pre-set and registered in the system area of ​​the magnetic recording medium. For example, when the setting value of the filling action is 0, the write head 10W for thermally assisted magnetic recording seeks on the track for dummy writing, irradiates the laser and records. Alternatively, when the setting value of the filling action is 1, the write head 10W for thermally assisted magnetic recording seeks on the track for dummy writing, and does not record based on laser irradiation. The filling time can be determined according to the setting value of the filling time. Here, the case of irradiating the laser and recording is described.

[0060] Next, the timing determination unit 19 - 3 determines whether or not to perform the filling operation, and sets the timing for performing the filling operation based on the obtained result ( ST12 ).

[0061] Next, recording is performed by the heat-assisted magnetic recording write head 10W (ST13).

[0062] Next, it is determined whether to change the floating volume (ST14). If not, the process returns to ST13 and the next recording is performed. The case where the floating volume is not changed may be, for example, the case where the highest floating volume in the partition for the next recording is less than the first height.

[0063] When changing the floating amount, for example, the main control unit obtains the highest floating amount in the partition for the next recording from the floating amount table for each area registered in the system area of ​​the magnetic recording medium included in the memory 17. The floating amount calculation unit 63 calculates the second height floating amount based on the highest floating amount (ST15).

[0064] The determination unit 64 receives the calculation result and determines the head floating amount (ST16). The floating amount control unit 19-1 receives the determination result from the determination unit 64 and controls the head floating amount to change it to a second height higher than the first height (ST17). The filling operation control unit 19-2 receives the result of the filling operation calculation unit 66, controls the operation of the write head 10W for thermally assisted magnetic recording, irradiates laser light and performs recording, and performs a filling operation of the lubricant between the write head 10W and the recording surface 1a (ST18), thereby forming a lubricant filling area having a second height.

[0065] It is determined whether to perform the next recording (ST19). If recording is to be performed, the process returns to ST13 and performs the next recording.

[0066] End without recording.

[0067] Example 1

[0068] Produced 20 units with Figure 1 A heat-assisted magnetic recording and reproducing device of the same structure. Among them, 10 devices are set as Example 1 by adding the process of forming the lubricant filling area of ​​the solidified part, and the remaining 10 devices are set as Comparative Example 1 without performing the special process of forming the lubricant filling area. When forming the lubricant filling area, move to the partition used to form the lubricant filling area, and write 1000 random patterns with the laser turned on. The floating height of this device is set to be constant for all partitions. In order to form the lubricant filling area, the floating amount is increased by 0.2nm for writing. The formation of the lubricant filling area is automatically performed at a certain time interval (this time once every 5 minutes) or when the partition is changed.

[0069] Then, when the partition changes significantly during writing (when the radial position moves by 5 mm or more), the bit error rate (BER) per hour is measured.

[0070] Fig.11 This is a graph showing the results of measuring the bit error rate per hour for one device in Example 1 and one device in Comparative Example 1.

[0071] As shown in the figure, in both Example 1 (curve 101 ) and Comparative Example 1 (curve 102 ), the BER is improved over time and approaches a certain value.

[0072] This is believed to be because the lubricant is filled between the head and the medium, and solidification progresses with repeated writing. However, in Example 1, in which the formation process of the lubricant filling area is added, the time until the BER reaches a certain value is shortened to about 1 / 5. It is believed that the reason is that since there is already a lubricant that is about to solidify, the time required for the BER to reach a certain value is shortened. This result shows that the formation process of the lubricant filling area in the embodiment can suppress the fluctuation of the BER and shorten the time until convergence.

[0073] Example 2

[0074] Produced 20 units with Figure 1 A heat-assisted magnetic recording and reproducing device of the same structure. 10 of them were set as Example 2 by adding the process of forming the lubricant filling area of ​​the solidified part, and the remaining 10 were set as Comparative Example 2 without performing the special process of forming the lubricant filling area. When forming the lubricant filling area, move to the partition used to form the lubricant filling area, and write 7200 random patterns with the laser turned on. The floating height of this device is set to be constant for all partitions. In order to form the lubricant filling area, the floating amount is increased by 0.3nm for writing. The formation of the lubricant filling area is automatically performed when it becomes idle.

[0075] Then, after the defect has passed, the lubricant filling area formation process is performed, and the BER per hour is measured. As a result, in both Example 2 and Comparative Example 2, the BER is improved over time and approaches a constant value. However, in Example 2, in which the lubricant filling area formation process is added, the time until the BER reaches a constant value is shortened to about 1 / 8. This result shows that the lubricant filling area formation process in the embodiment can suppress the fluctuation of the BER and shorten the time until convergence.

[0076] Example 3

[0077] Produced 20 units with Figure 1A heat-assisted magnetic recording and reproducing device of the same structure. 10 of them were set as Example 3 by adding the process of forming the lubricant filling area, and the remaining 10 were set as Comparative Example 3 without performing the special process of forming the lubricant filling area. When forming the lubricant filling area, a seek was performed on the track where the last writing was performed with the laser turned off. The floating height of this device is slightly different in all partitions, and the floating amount at the partition scheduled to be written next is increased by 0.3nm for seek. It is set that the formation of the lubricant filling area must be implemented in the case of a change in the partition and after passing over a registered defect.

[0078] Then, after the defect has passed, the lubricant filling area formation process is performed, and the BER per hour is measured. As a result, in both Example 3 and Comparative Example 3, the BER is improved over time and approaches a constant value. However, in Example 3, in which the lubricant filling area formation process is added, the time until the BER reaches a constant value is shortened to about 1 / 2. This result shows that the lubricant filling area formation process in the embodiment can suppress the fluctuation of the BER and shorten the time until convergence.

[0079] Several embodiments of the present invention have been described, but these embodiments are presented as examples and are not intended to limit the scope of the invention. These new embodiments can be implemented in various other ways, and various omissions, substitutions, and changes can be made without departing from the gist of the invention. These embodiments and their variations are included in the scope and gist of the invention, and are included in the invention described in the claims and their equivalents.

Claims

1. A method for controlling a magnetic recording and reproducing device, comprising: After recording is performed by the thermally assisted magnetic recording head at the first head flying height, The head floating height is changed to a second height higher than the first height, By operating the thermally assisted magnetic recording head, the lubricant is filled between the thermally assisted magnetic recording head and the recording surface, thereby forming the lubricant filling region at the second height.

2. The control method of the magnetic recording and reproducing device according to claim 1, The first height is equal to or higher than the highest floating amount in the partition where recording is performed.

3. The control method of the magnetic recording and reproducing device according to claim 1, The second height is equal to or higher than the highest floating height in the partition where recording is performed after the head floating height is changed.

4. The control method of the magnetic recording and reproducing device according to claim 1, The lubricant is filled onto the surface of the thermally assisted magnetic recording head by changing the head flying height to a second height that is higher than the first height.

5. The control method of the magnetic recording and reproducing device according to claim 1, The thermally assisted magnetic recording head is operated to perform a seek on the recording surface.

6. The control method of the magnetic recording and reproducing device according to claim 1, Operating the thermally-assisted magnetic recording head is to perform a thermally-assisted magnetic recording operation on the recording surface.

7. The control method of the magnetic recording and reproducing device according to claim 1, The track on which the thermally-assisted magnetic recording head is operated is the same as the track on which the thermally-assisted magnetic recording was last performed.

8. The control method of the magnetic recording and reproducing device according to claim 1, The track on which the heat-assisted magnetic recording head is operated is a specially prepared track.

9. The control method of the magnetic recording and reproducing device according to claim 1, The magnetic recording and reproducing device contains oxygen in a ratio of 1% to 20%.

10. A magnetic recording and reproducing device, comprising: heat-assisted magnetic recording heads; A heat-assisted magnetic recording medium having a lubricant disposed on a recording surface; a floating amount control unit that changes the head floating amount to a second height higher than the first height after recording is performed by the thermally assisted magnetic recording head at a first head floating amount; and The filling operation control unit fills the lubricant between the thermally assisted magnetic recording head and the recording surface by operating the thermally assisted magnetic recording head on the recording surface, thereby forming a lubricant filling region having a second height.

11. The magnetic recording and reproducing device according to claim 10, The first height is equal to or higher than the highest floating amount in the partition where recording is performed.

12. The magnetic recording and reproducing device according to claim 10, The second height is equal to or higher than the highest floating height in the partition where recording is performed after the head floating height is changed.

13. The magnetic recording and reproducing device according to claim 10, The lubricant is filled onto the surface of the thermally assisted magnetic recording head by changing the head flying height to a second height that is higher than the first height.

14. The magnetic recording and reproducing device according to claim 10, The thermally assisted magnetic recording head is operated to perform a seek on the recording surface.

15. The magnetic recording and reproducing device according to claim 10, Operating the thermally-assisted magnetic recording head is to perform a thermally-assisted magnetic recording operation on the recording surface.

16. The magnetic recording and reproducing device according to claim 10, The track on which the thermally-assisted magnetic recording head is operated is the same as the track on which the thermally-assisted magnetic recording was last performed.

17. The magnetic recording and reproducing device according to claim 10, The track on which the heat-assisted magnetic recording head is operated is a specially prepared track.

18. The magnetic recording and reproducing device according to claim 10, The magnetic recording and reproducing device contains oxygen in a ratio of 1% to 20%.

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