WO2011162280A1 - 磁気記録媒体 - Google Patents
磁気記録媒体 Download PDFInfo
- Publication number
- WO2011162280A1 WO2011162280A1 PCT/JP2011/064214 JP2011064214W WO2011162280A1 WO 2011162280 A1 WO2011162280 A1 WO 2011162280A1 JP 2011064214 W JP2011064214 W JP 2011064214W WO 2011162280 A1 WO2011162280 A1 WO 2011162280A1
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- WIPO (PCT)
- Prior art keywords
- glass substrate
- heat conduction
- magnetic recording
- magnetic
- conduction region
- Prior art date
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- 239000000758 substrate Substances 0.000 claims abstract description 80
- 239000011521 glass Substances 0.000 claims abstract description 74
- 230000002093 peripheral effect Effects 0.000 claims description 17
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- 230000015572 biosynthetic process Effects 0.000 description 2
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- 230000001050 lubricating effect Effects 0.000 description 2
- 239000006249 magnetic particle Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
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- 229910000599 Cr alloy Inorganic materials 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 229910005335 FePt Inorganic materials 0.000 description 1
- 240000006829 Ficus sundaica Species 0.000 description 1
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- 239000000696 magnetic material Substances 0.000 description 1
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- 229910052759 nickel Inorganic materials 0.000 description 1
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- 229910052720 vanadium Inorganic materials 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/74—Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum
- G11B5/82—Disk carriers
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/187—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/73—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer
- G11B5/739—Magnetic recording media substrates
- G11B5/73911—Inorganic substrates
- G11B5/73921—Glass or ceramic substrates
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B2005/0002—Special dispositions or recording techniques
- G11B2005/0005—Arrangements, methods or circuits
- G11B2005/0021—Thermally assisted recording using an auxiliary energy source for heating the recording layer locally to assist the magnetization reversal
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
- G11B23/0057—Intermediate mediums, i.e. mediums provided with an information structure not specific to the method of reproducing or duplication such as matrixes for mechanical pressing of an information structure ; record carriers having a relief information structure provided with or included in layers not specific for a single reproducing method; apparatus or processes specially adapted for their manufacture
- G11B23/0064—Intermediate mediums, i.e. mediums provided with an information structure not specific to the method of reproducing or duplication such as matrixes for mechanical pressing of an information structure ; record carriers having a relief information structure provided with or included in layers not specific for a single reproducing method; apparatus or processes specially adapted for their manufacture mediums or carriers characterised by the selection of the material
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
Definitions
- the present invention relates to a magnetic recording medium suitable as a substrate for an information recording medium such as a hard disk (HDD), particularly as a substrate for a heat-assisted recording medium.
- a magnetic recording medium suitable as a substrate for an information recording medium such as a hard disk (HDD), particularly as a substrate for a heat-assisted recording medium.
- HDD hard disk
- an aluminum alloy has been used as a substrate for an information recording medium such as a hard disk (HDD).
- HDD hard disk
- glass substrates are now widely used (for example, Patent Documents 1 to 6). .
- the coercive force of the magnetic recording film is preferably high from the viewpoint of increasing the recording density. The higher the coercive force of the magnetic recording film, the more the magnetic recording film is subjected to information recording. It is necessary to increase the degree of heating.
- adjacent sectors located on the inner and outer peripheral sides, which may affect the magnetic recording state of the adjacent sectors (cross-write phenomenon).
- Patent Document 1 discloses a structure in which a heat conduction region is provided between tracks to suppress heat spread.
- a heat conduction region is provided between the tracks, the surface roughness of the heat conduction region becomes rougher than the surface of the glass substrate, so the surface roughness of the heat conduction region is the surface of the magnetic recording film. Affects roughness.
- the magnetic recording head collides with the glass substrate when reading the recording information using the magnetic recording head, thereby causing a read error.
- the present invention has been made in view of the above-described situation, and an object of the present invention is to provide a magnetic recording medium capable of suppressing the cross-write phenomenon and reducing the occurrence rate of read errors. Is to provide.
- a magnetic recording medium based on the present invention is a magnetic recording medium used in a thermally assisted recording method, and is a glass substrate having an annular disk shape and at least one main surface of two main surfaces of the glass substrate. And a magnetic recording layer in which a plurality of annular tracks having a plurality of sectors separated in the circumferential direction as recording areas are defined in the radial direction, and the main substrate of the glass substrate on which the magnetic recording layer is formed. On the surface, a plurality of annular first heat conduction regions having a higher thermal conductivity than the glass substrate are provided concentrically with the center of the glass substrate, and the first heat conduction region straddles the plurality of tracks. The radial width of the first heat conduction region is larger than the depth of the first heat conduction region from the main surface.
- the depth of the first heat conduction region from the main surface is 5 nm or more and less than 20 nm.
- the area arranged per unit area of the glass substrate of the first heat conduction region is provided larger toward the inner peripheral side of the glass substrate.
- the glass substrate further includes a second heat conduction region that extends in a radial direction of the glass substrate so as to intersect the first heat conduction region and has a larger thermal conductivity than the glass substrate.
- the depth of the second heat conduction region from the main surface is not less than 5 nm and less than 20 nm.
- the area of the second heat conduction region arranged per unit area of the glass substrate is increased toward the inner peripheral side of the glass substrate.
- the magnetic recording medium based on the present invention it is possible to provide a magnetic recording medium capable of suppressing the cross write phenomenon and reducing the read error occurrence rate.
- 1 is a plan view showing a schematic configuration of a thermally-assisted magnetic recording apparatus in an embodiment.
- 1 is a side view showing a schematic configuration of a heat-assisted magnetic recording apparatus in an embodiment. It is a perspective view which shows the glass substrate used for the magnetic disc in embodiment. 1 is a perspective view showing a magnetic disk in an embodiment. It is a partial expanded sectional view of the other magnetic disc in an embodiment. It is a flowchart which shows the manufacturing process of the magnetic disc in embodiment. It is a plane schematic diagram which shows arrangement
- FIGS. 1 is a plan view showing a schematic configuration of the thermally-assisted magnetic recording device 2
- FIG. 2 is a side view showing the schematic configuration of the thermally-assisted magnetic recording device 2
- FIG. 3 is a glass substrate used for the magnetic disk 1.
- 1G is a perspective view showing the magnetic disk 1
- FIG. 5 is a partially enlarged sectional view of another magnetic disk 1A
- FIG. 6 is a flowchart showing the manufacturing process of the magnetic disk.
- the heat-assisted magnetic recording apparatus 2 includes a magnetic recording head 2D disposed opposite to a magnetic disk 1 for heat-assisted magnetic recording that is a magnetic recording medium that is rotationally driven in the direction of arrow DR1. Yes.
- the magnetic recording head 2D is mounted on the tip of the suspension 2C.
- the suspension 2C is provided so as to be rotatable in the direction of the arrow DR2 (tracking direction) with the support shaft 2A as a fulcrum.
- a tracking actuator 2B is attached to the support shaft 2A.
- the laser beam LB is irradiated on the side facing the magnetic recording head 2D across the magnetic disk 1. A portion to be recorded on the magnetic disk 1 is instantaneously heated by the laser beam LB, and data is recorded on the magnetic disk 1 by the magnetic recording head 2D.
- the magnetic particles of the magnetic layer formed on the magnetic disk 1 have a lower holding force as the temperature rises.
- the position of the magnetic recording head 2D and the irradiation position of the laser beam LB are configured to face the magnetic disk. However, in order to simplify the configuration and position control of the head, they are provided on the magnetic disk 1. Alternatively, they may be arranged on the same side. In particular, when both surfaces of the magnetic disk 1 are used as recording surfaces, they are arranged on the same side.
- FIG. 1 is a perspective view showing a glass substrate 1G used for the magnetic disk 1
- FIG. 4 is a perspective view showing the magnetic disk 1. As shown in FIG.
- the glass substrate 1G used for the magnetic disk 1 has an annular disk shape with a hole 11 formed in the center.
- the glass substrate 1G has an outer peripheral end face 12, an inner peripheral end face 13, a front main surface 14, and a back main surface 15.
- the outer diameter is about 64 mm
- the inner diameter is about 20 mm
- the thickness is about 0.8 mm.
- the main surface of the glass substrate 1G on which a magnetic layer 23 described later is formed is provided with a plurality of annular heat conduction regions concentric with the center of the glass substrate 1G.
- the detailed structure of the heat conduction region will be described later.
- a magnetic layer 23 is formed on the front main surface 14 of the glass substrate 1G.
- the magnetic layer 23 is formed only on the front main surface 14, but it is also possible to provide the magnetic layer 23 on the back main surface 15 (see FIG. 11).
- a conventionally known method can be used. For example, a method in which a thermosetting resin in which magnetic particles are dispersed is spin-coated on a substrate, or a method in which sputtering or electroless plating is used. A method is mentioned.
- the film thickness by spin coating is about 0.3 ⁇ m to 1.2 ⁇ m
- the film thickness by sputtering is about 0.04 ⁇ m to 0.08 ⁇ m
- the film thickness by electroless plating is 0.05 ⁇ m to 0.1 ⁇ m. From the viewpoint of thinning and densification, film formation by sputtering and electroless plating is preferable.
- the magnetic material used for the magnetic layer 23 is not particularly limited, and a conventionally known material can be used. However, in order to obtain a high coercive force, Co having high crystal anisotropy is basically used, and Ni is used for the purpose of adjusting the residual magnetic flux density. A Co-based alloy or the like to which Cr is added is suitable. In recent years, FePt-based materials have been used as magnetic layer materials suitable for heat-assisted recording.
- a lubricant may be thinly coated on the surface of the magnetic layer 23 in order to improve the sliding of the magnetic recording head.
- the lubricant include those obtained by diluting perfluoropolyether (PFPE), which is a liquid lubricant, with a freon-based solvent.
- an underlayer or a protective layer may be provided.
- the underlayer in the magnetic disk is selected according to the magnetic film.
- the material for the underlayer include at least one material selected from nonmagnetic metals such as Cr, Mo, Ta, Ti, W, V, B, Al, and Ni.
- the underlayer is not limited to a single layer, and may have a multi-layer structure in which the same or different layers are stacked.
- a multilayer underlayer such as Cr / Cr, Cr / CrMo, Cr / CrV, NiAl / Cr, NiAl / CrMo, or NiAl / CrV may be used.
- Examples of the protective layer for preventing wear and corrosion of the magnetic layer 23 include a Cr layer, a Cr alloy layer, a carbon layer, a hydrogenated carbon layer, a zirconia layer, and a silica layer. These protective layers can be formed continuously with an in-line type sputtering apparatus, such as an underlayer and a magnetic film. In addition, these protective layers may be a single layer, or may have a multilayer structure including the same or different layers.
- a tetraalkoxylane is diluted with an alcohol solvent on the Cr layer, and then colloidal silica fine particles are dispersed and applied, followed by baking to form a silicon oxide (SiO2) layer. May be.
- FIG. 5 shows an example of the configuration of another magnetic disk 1A.
- FIG. 5 is a partially enlarged cross-sectional view of another magnetic disk 1A.
- a magnetic recording layer 20 having a plurality of layers is formed on a glass substrate 1G.
- the magnetic recording layer 20 has a seed (unevenness control) layer 21 made of AlN or the like directly formed on the front main surface 14 of the glass substrate 1G, and a thickness of about 60 nm formed on the seed (unevenness control) layer 21.
- the underlayer 22, the magnetic layer 23 having a thickness of about 30 nm formed on the underlayer 22, the protective layer 24 having a thickness of about 10 nm formed on the magnetic layer 23, and the protective layer 24 are formed.
- a lubricating layer 25 having a thickness of about 0.8 nm.
- the configuration of the magnetic disk 1A is merely an example, and the size of the glass substrate 1G and the configuration of the magnetic recording layer 20 are appropriately changed according to the performance required for the magnetic disk 1A.
- step 10 a “glass melting step” in step 10 (hereinafter abbreviated as “S10”, the same applies to step 20 and subsequent steps), the glass material constituting the substrate is melted.
- step 20 the same applies to step 20 and subsequent steps
- the molten glass is poured onto the lower mold and press molded with the upper mold.
- the surface of the press-molded glass substrate is polished and the flatness of the glass substrate is preliminarily adjusted. Further, in the “precision polishing step” of S40, the glass substrate is subjected to polishing processing again, and the flatness and the like are finely adjusted. In addition, the manufacturing process of a heat conductive area
- the glass substrate is cleaned. Through the above steps, a glass substrate applicable to the hard disk substrate is obtained.
- a film to be a recording layer is formed on the glass substrate.
- heat treatment for improving the crystal magnetic field anisotropy is performed.
- the heating temperature is about 600 ° C.
- FIG. 7 is a schematic plan view of the magnetic disk 1A showing the arrangement of the first heat conduction region 101
- FIG. 8 is a partially enlarged sectional view taken along the line VIII in FIG. 7
- FIG. 9 is a diagram of the magnetic disk 1A.
- 2 is a plan view schematically showing a track T and a sector S.
- the main surface of glass substrate 1G on which magnetic recording layer 20 is formed is concentric with the center of glass substrate 1G and has a plurality of annular shapes larger than the thermal conductivity of glass substrate 1G.
- a first heat conduction region 101 is provided.
- Each of the first heat conductive regions 101 is provided so as to straddle the track T which is a region to be magnetically recorded on the magnetic recording layer 20.
- the broken lines shown in the magnetic recording layer 20 of FIG. 8 are described with the image of the track T, and the actual width and track pitch of the track T do not match.
- the distance (P) between adjacent first heat conduction regions 101 in the radial direction (r) is about 0.25 ⁇ m to about 0.5 ⁇ m
- the first heat conduction region 101 has a radial direction (r ) Is about 0.1 ⁇ m to about 0.2 ⁇ m
- the depth (H) from the main surface 14 of the glass substrate 1G is about 0.005 ⁇ m (5 nm) or more to about 0.02 ⁇ m (20 nm). ) Less than.
- the width (W) is larger than the depth (H).
- the width (SW) in the circumferential direction (c) of one sector S is about 100 nm
- the track T The width (TW) in the radial direction (r) is about 10 nm
- the track pitch (TP) is about 150 nm.
- the width (W) in the radial direction (r) of the first heat conduction region 101 is about 0.15 ⁇ m
- one first heat conduction region 101 is formed on about 15 tracks T. It will be provided across.
- the first heat conductive region 101 it is preferable to use a high heat conductive material such as Ag, Ag alloy (for example, AgSi), Al, Al alloy, Au, Cu, etc. as a material having a higher thermal conductivity than the glass substrate 1G. .
- the thermal conductivity of the glass substrate 1G is about 0.6 W / m ⁇ k, whereas the thermal conductivity of the high thermal conductivity material described above is about 200 W / m ⁇ k to about 400 W / m ⁇ k. is there.
- the thermal energy supplied per unit time is larger as the track T on which the recording is performed is positioned on the inner peripheral side. Therefore, it is preferable that the area of the first heat conduction region 101 arranged per unit area of the glass substrate 1G is increased toward the inner peripheral side of the glass substrate 1G.
- the pitch of the first thermal conduction regions 101 in the radial direction (r) becomes finer toward the inner peripheral side (0 .1 ⁇ m to 0.3 ⁇ m).
- the width (W) in the radial direction (r) of the plurality of first heat conduction regions 101 is different, the width (W) of the first heat conduction region 101 in the radial direction (r) is increased toward the inner peripheral side. It is preferable to do.
- FIGS. 10 to 13 are first to fourth cross-sectional views showing the manufacturing process of the heat conduction region provided in the magnetic disk.
- a resist mask 201 in which a predetermined opening pattern is formed on the front main surface 14 of the glass substrate 1G is formed.
- the glass substrate 1G is etched using the resist mask 201 to form a plurality of grooves 101g.
- a predetermined high thermal conductive material is deposited on each groove by sputtering method from above resist mask 201 having an opening corresponding to groove 101g.
- the high heat conductive material Ag, Ag alloy (for example, AgSi), Al, Al alloy, Au, Cu, or the like described above is used. Thereby, the 1st heat conductive area
- the groove is formed by sputtering performed using a plurality of targets made of materials having different thermal conductivities. While the deposition rate of each material is varied for each 101 g, the high thermal conductive material is deposited at a different composition ratio for each groove 101 g.
- the magnetic recording layer 20 is formed on the front main surface 14 of the glass substrate 1G.
- the seed (unevenness control) layer, the underlayer, the magnetic layer, the protective layer, the lubricating layer, and the like described with reference to FIG. 5 are formed by sputtering.
- the magnetic disk 1A is completed.
- the main surface of the glass substrate 1 ⁇ / b> G on which the magnetic recording layer 20 is formed is concentric with the center of the glass substrate 1 ⁇ / b> G and has a plurality of annular first heat conduction regions 101. Is provided. Each of the first heat conductive regions 101 is provided so as to straddle the track T which is a region to be magnetically recorded on the magnetic recording layer 20.
- the first heat conduction region 101 is formed such that the width (W) is larger than the depth (H), and the depth (H) is It is formed relatively shallow, about 15 nm.
- the film is stacked while growing the film-forming particles. Therefore, as the film thickness increases, the diameter of the film-forming particles increases. As a result, the surface roughness of the laminated film depends on the size of the diameter of the finally formed film.
- FIG. 14 shows the case where four second heat conduction regions 102 are provided at a pitch of 90 degrees, but the number provided is appropriately selected.
- the area of the second heat conduction region 102 disposed per unit area of the glass substrate 1G is increased toward the inner peripheral side of the glass substrate 1G. It can be said that it is preferable.
- the width in the circumferential direction (c) of the second heat conduction region 102 is also set to about 0.1 ⁇ m to about 0.2 ⁇ m, similarly to the first heat conduction region 101, so that the width of one sector S Since (SW) is about 0.05 ⁇ m to about 0.1 ⁇ m, one second heat conduction region 102 is provided across one or two sectors S.
- the magnetic recording layer is provided on the front main surface 14 side of the glass substrate 1G.
- the magnetic recording layer is also provided on the back main surface 15 side of the glass substrate 1G.
- a heat conduction region is also provided on the back main surface 15 side.
- 2 thermally assisted magnetic recording device 2A support shaft, 2B tracking actuator, 2C suspension, 2D magnetic recording head, 11 holes, 12 outer peripheral end face, 13 inner peripheral end face, 14 table Main surface, 15 back main surface, 20 magnetic recording layer, 21 seed (irregularity control) layer, 22 underlayer, 23 magnetic layer, 24 protective layer, 25 lubrication layer, 101 first heat conduction region, 102 second heat conduction region .
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- Recording Or Reproducing By Magnetic Means (AREA)
Abstract
Description
まず、図1から図6を参照して、熱アシスト磁気記録装置2の概略構成の一例について説明する。なお、図1は、熱アシスト磁気記録装置2の概略構成を示す平面図、図2は、熱アシスト磁気記録装置2の概略構成を示す側面図、図3は、磁気ディスク1に用いられるガラス基板1Gを示す斜視図、図4は、磁気ディスク1を示す斜視図、図5は、他の磁気ディスク1Aの部分拡大断面図、図6は、磁気ディスクの製造工程を示すフロー図である。
次に、図3および図4を参照して、磁気ディスク1の構成について説明する。なお、図3は、磁気ディスク1に用いられるガラス基板1Gを示す斜視図、図4は、磁気ディスク1を示す斜視図である。
図5に、他の磁気ディスク1Aの構成の一例を示す。図5は、他の磁気ディスク1Aの部分拡大断面図である。この磁気ディスク1Aは、ガラス基板1Gの上に複数層を有する磁気記録層20が形成されている。
次に、図6のフローチャートを用いて、本実施の形態に係るガラス基板を含む磁気ディスク1Aの製造方法を説明する。
次に、図7から図9を参照して、本実施の形態における磁気ディスク1Aに設けられる第1熱伝導領域101について詳細に説明する。なお、図7は、第1熱伝導領域101の配置を示す磁気ディスク1Aの平面模式図、図8は、図7中のVIII線矢視の部分拡大断面図、図9は、磁気ディスク1AのトラックTとセクターSとを模式的に示す平面図である。
次に、図10から図13を参照して、第1熱伝導領域101の製造方法について説明する。なお、図10から図13は、磁気ディスクに設けられる熱伝導領域の製造工程を示す第1から第4断面図である。
Claims (6)
- 熱アシスト記録方式に用いられる磁気記録媒体であって、
環状の円板形状を有するガラス基板(1G)と、
前記ガラス基板の2つの主表面のうち少なくとも一方の主表面に設けられ、記録領域として周方向(c)に分離される複数のセクター(s)を有する環状のトラック(T)が半径方向(r)に複数規定される磁気記録層(20)と、を備え、
前記磁気記録層(20)が形成された前記ガラス基板(1G)の前記主表面には、前記ガラス基板(1G)の中心と同心に、前記ガラス基板(1G)よりも熱伝導率が大きい複数の環状の第1熱伝導領域(101)が設けられ、
前記第1熱伝導領域(101)は、複数の前記トラック(T)を跨ぐように設けられ、
前記第1熱伝導領域(101)の前記主表面からの深さ(H)よりも、前記第1熱伝導領域(101)の半径方向の幅(W)の方が大きく設けられる、磁気記録媒体。 - 前記第1熱伝導領域(101)の前記主表面からの深さ(H)は、5nm以上20nm未満である、請求項1に記載の磁気記録媒体。
- 前記第1熱伝導領域(101)の前記ガラス基板(1G)の単位面積当たりに配置される面積は、前記ガラス基板(1G)の内周側に向かうほど大きく設けられる、請求項1に記載の磁気記録媒体。
- 前記第1熱伝導領域(101)に交差するように前記ガラス基板(1G)の半径方向(r)に延び、前記ガラス基板(1G)よりも熱伝導率が大きい第2熱伝導領域(102)をさらに含む、請求項1に記載の磁気記録媒体。
- 前記第2熱伝導領域(102)の前記主表面からの深さ(H)は、5nm以上20nm未満である、請求項4に記載の磁気記録媒体。
- 前記第2熱伝導領域(102)の前記ガラス基板(1G)の単位面積当たりに配置される面積は、前記ガラス基板(1G)の内周側に向かうほど大きく設けられる、請求項4に記載の磁気記録媒体。
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