WO2011093232A1 - 磁気記録媒体の製造装置及び製造方法 - Google Patents
磁気記録媒体の製造装置及び製造方法 Download PDFInfo
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- WO2011093232A1 WO2011093232A1 PCT/JP2011/051182 JP2011051182W WO2011093232A1 WO 2011093232 A1 WO2011093232 A1 WO 2011093232A1 JP 2011051182 W JP2011051182 W JP 2011051182W WO 2011093232 A1 WO2011093232 A1 WO 2011093232A1
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- magnetic recording
- recording medium
- liquid
- lubricant
- inner peripheral
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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
- G11B5/84—Processes or apparatus specially adapted for manufacturing record carriers
- G11B5/8408—Processes or apparatus specially adapted for manufacturing record carriers protecting the magnetic layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C13/00—Means for manipulating or holding work, e.g. for separate articles
- B05C13/02—Means for manipulating or holding work, e.g. for separate articles for particular articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C3/00—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material
- B05C3/02—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/18—Processes for applying liquids or other fluent materials performed by dipping
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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
- G11B5/84—Processes or apparatus specially adapted for manufacturing record carriers
Definitions
- a disk-shaped magnetic recording medium having a central hole is immersed in a dipping tank containing a liquid lubricant, and then the magnetic recording medium is pulled up from the dipping tank so that a lubricant film is formed on the surface of the magnetic recording medium.
- the present invention relates to a manufacturing apparatus and a manufacturing method of a magnetic recording medium to be formed.
- the CSS (contact activation stop) method is the mainstream of hard disk drives, where the basic operation from starting to stopping of the magnetic head is contact sliding-floating-contact sliding with respect to the magnetic recording medium. Since then, contact sliding of the magnetic head on the magnetic recording medium has been unavoidable.
- the problem about tribology between the magnetic head and the magnetic recording medium has become a fateful technical problem, and there are many efforts to improve the protective film laminated on the magnetic film of the magnetic recording medium.
- the wear resistance and sliding resistance on the surface of the medium are a major pillar for improving the reliability of the magnetic recording medium.
- a protective layer of a magnetic recording medium materials made of various materials have been proposed, but a carbon film is mainly used from the comprehensive viewpoint such as film formability and durability. Further, the hardness, density, dynamic friction coefficient, etc. of the carbon film are very important because they are reflected in the CSS characteristics or corrosion resistance characteristics of the magnetic recording medium.
- a lubricant film is formed on the surface of the protective layer.
- the main role of the lubricant film is to prevent the protective layer of the magnetic recording medium from directly contacting the atmosphere, to improve its corrosion resistance, and when the magnetic head slider accidentally contacts the data surface of the magnetic recording medium.
- the magnetic head slider is prevented from coming into direct contact with the protective layer, and the frictional force of the magnetic head slider sliding on the magnetic recording medium is remarkably reduced.
- the lubricant film formed on the surface of the magnetic recording medium is strictly controlled in sub-nm units, and a method for forming the lubricant film includes a dipping bath containing a liquid lubricant.
- a so-called dipping method in which a lubricant film is uniformly formed on the surface of the magnetic recording medium by immersing the magnetic recording medium in the immersion tank and then lifting the magnetic recording medium from the immersion tank has been widely used.
- a batch processing method is generally adopted from the viewpoint of mass productivity, and a plurality of magnetic recording media are immersed in an immersion tank in a state where they are arranged, and processed in a lump.
- the magnetic recording medium immersed in the immersion tank is supported in a suspended state by a hanger inserted through its central hole, and when this hanger is pulled up from the immersion tank containing the liquid lubricant, The liquid surface of the liquid lubricant is disturbed (swayed).
- the hanger comes out of the liquid surface, the droplets (liquid pool) attached to the hanger bounce or sag, causing unevenness in the film thickness distribution of the lubricant film formed on the surface of the magnetic recording medium. It tends to occur.
- the present invention has been proposed in view of such a conventional situation, and a magnetic recording medium manufacturing apparatus and manufacturing capable of forming a lubricant film with a uniform film thickness on the surface of the magnetic recording medium. It aims to provide a method.
- the present invention provides the following means. (1) After immersing a disk-shaped magnetic recording medium having a central hole in a dipping tank containing a liquid lubricant, a lubricant film is formed on the surface of the magnetic recording medium by lifting the magnetic recording medium from the dipping tank.
- An apparatus for manufacturing a magnetic recording medium A hanger mechanism that is inserted through the central hole of the magnetic recording medium and supports the magnetic recording medium in a suspended state; An elevating mechanism for elevating / lowering one of the hanger mechanism and the immersion tank with respect to the other; The hanger mechanism is provided between a support plate whose upper end is in contact with the inner peripheral portion of the magnetic recording medium and an inner peripheral portion of the magnetic recording medium that is provided extending from the lower end of the support plate.
- An apparatus for manufacturing a magnetic recording medium comprising: a liquid draining plate that forms a gap along the inner peripheral portion.
- the hanger mechanism is provided with a pair of support plates whose upper end portions are in contact with the inner peripheral portion of the magnetic recording medium, and extending in opposite directions from the lower end portions of the pair of support plates.
- the apparatus for manufacturing a magnetic recording medium according to (1) further comprising a pair of liquid drain plates that form a gap along the inner peripheral portion between the inner peripheral portion of the magnetic recording medium.
- the liquid draining plate is bent in the direction away from the inner peripheral part of the magnetic recording medium from the middle part to the lower end part. Manufacturing apparatus for magnetic recording media.
- the lower end of the liquid draining plate is located below the position where the liquid pool accumulated in the gap with the inner peripheral part of the magnetic recording medium is drained.
- the upper end portion of the support plate is provided with a groove portion with which the inner peripheral portion of the magnetic recording medium is engaged.
- (7) The apparatus for manufacturing a magnetic recording medium according to any one of (1) to (6), wherein the hanger mechanism supports a plurality of the magnetic recording media arranged in a line.
- the magnetic recording medium is immersed in an immersion tank containing a liquid lubricant while being supported by the hanger mechanism inserted through the central hole of a disk-shaped magnetic recording medium having a central hole. Then, the magnetic recording medium is formed by lifting the magnetic recording medium from the immersion tank to form a lubricant film on the surface of the magnetic recording medium, the hanger mechanism having the upper end portion of the magnetic recording medium.
- the magnetic recording medium when pulled out of the immersion tank containing the liquid lubricant, the fluctuation of the liquid level generated at the moment when the liquid level of the liquid lubricant is cut by the support plate is detected.
- a liquid draining plate that forms a gap along the inner peripheral portion with the inner peripheral portion, it can be kept low.
- the lubricant film is uniformly formed on the surface of the magnetic recording medium while preventing the occurrence of linear coating unevenness in the film thickness distribution of the lubricant film formed on the surface of the magnetic recording medium. Since it can be formed with a film thickness, it is possible to provide a magnetic recording medium suitable for lowering the flying height of the magnetic head and excellent in wear resistance and environmental resistance.
- FIG. 2 is a cross-sectional view of the hanger mechanism along line X-X ′ shown in FIG. 1. It is the principal part top view which looked at the hanger mechanism shown in FIG. 1 from upper direction.
- FIG. 4 is a cross-sectional view of the hanger mechanism along a line Y-Y ′ shown in FIG. 3. It is a side view which shows the simulation result which compared the state of the liquid level of the liquid lubricant at the time of pulling up a magnetic recording medium from an immersion tank, and shows the state before a liquid pool is formed.
- FIG. 6 is a characteristic diagram showing a simulation in which the liquid level of the liquid lubricant is measured when the magnetic recording medium is pulled up from the immersion tank. It is a characteristic view which expands and shows the vicinity of the liquid runout point of the graph shown in FIG. It is a side view which shows the modification of a liquid cutting plate. It is sectional drawing which shows an example of a magnetic recording medium. It is a perspective view which shows an example of a magnetic recording / reproducing apparatus.
- Magnetic recording medium manufacturing equipment An apparatus for manufacturing a magnetic recording medium to which the present invention is applied, for example, as shown in FIG. 1, after immersing a disk-shaped magnetic recording medium 100 having a central hole 100a in an immersion tank 1 containing a liquid lubricant L, This is a so-called dipping device in which a lubricant film is formed on the surface of the magnetic recording medium 100 by pulling up the magnetic recording medium 100 from the immersion tank 1.
- the dipping device is inserted through the center hole 100 a of the magnetic recording medium 100 and supports the magnetic recording medium 100 in a suspended state.
- the hanger mechanism 2 and the raising / lowering mechanism 3 which raises / lowers either one of this hanger mechanism 2 and the immersion tank 1 with respect to the other are provided.
- the hanger mechanism 2 has a pair of support plates 4a and 4b provided in parallel with each other and extending in the horizontal direction.
- a plurality of V-shaped groove portions 5 with which the inner peripheral portion of the magnetic recording medium 100 is engaged are provided at the upper end portions of the pair of support plates 4a and 4b.
- the plurality of magnetic recording media 100 are supported in a state of being arranged in parallel in the longitudinal direction. Further, the magnetic recording medium 100 can be stably held by contacting the inner peripheral portion of the magnetic recording medium 100 with such a groove 5.
- a slit 6 is provided at the bottom of the groove 5 to cut out the pair of support plates 4a and 4b vertically downward.
- the slit 6 is for promptly guiding the liquid lubricant L accumulated between the groove 5 and the inner periphery of the magnetic recording medium 100 engaged with the groove 5 downward. It is cut out in a straight line (or V shape) with a width narrower than the thickness of 100.
- the hanger mechanism 2 has a pair of liquid drain plates 7a and 7b that extend in opposite directions from the lower ends of the pair of support plates 4a and 4b and are bent along the inner periphery of the magnetic recording medium 100. is doing.
- the pair of liquid cutting plates 7 a and 7 b are curved in an arc shape with a certain gap S between the inner peripheral portion of the magnetic recording medium 100. Further, the lower ends of the pair of liquid cutting plates 7 a and 7 b are located above a horizontal line passing through the center of the magnetic recording medium 100. Further, it is preferable that the lower end portions of the liquid drain plates 7a and 7b are located below the position where the liquid pool accumulated in the gap S between the inner periphery of the magnetic recording medium 100 described later is drained.
- the lifting mechanism 3 is not particularly limited as long as it is a mechanism capable of immersing the magnetic recording medium 100 in the immersion tank 1 containing the liquid lubricant L and pulling up the magnetic recording medium 100 from the immersion tank 1. It is not something.
- a support pole 8 that cantilever-supports the base ends of the pair of support plates 4a and 4b, a nut portion 9 attached to the support pole 8, a lead screw 10 meshed with the nut portion 9, and this
- a drive motor 11 that rotationally drives the lead screw 10, and the drive motor 11 rotationally drives the lead screw 10, and moves the support pole 8 up and down together with the nut portion 9 meshed with the lead screw 10.
- the pair of support plates 4 a and 4 b can be lifted and lowered with respect to the immersion tank 1.
- the liquid level of the liquid lubricant L by the support plates 4a and 4b when the magnetic recording medium 100 immersed in the liquid lubricant L in the immersion tank 1 is pulled up from the immersion tank 1, the liquid level of the liquid lubricant L by the support plates 4a and 4b.
- the fluctuation of the liquid level that occurs at the moment when the ink is cut can be suppressed to a low level by providing the liquid cutting plates 7 a and 7 b that form the gap S along the inner peripheral portion with the inner peripheral portion of the magnetic recording medium 100. it can.
- the liquid lubricant L is pulled by pulling the magnetic recording medium 100 immersed in the liquid lubricant L in the immersion tank 1 from the immersion tank 1 at a constant speed.
- the liquid level t moves downward along the surface of the magnetic recording medium 100.
- the magnetic recording medium 100 immersed in the liquid lubricant L in the immersion tank 1 is pulled up from the immersion tank 1 at a constant speed.
- the liquid level t of the liquid lubricant L moves downward along the surface of the magnetic recording medium 100.
- the support is
- the liquid level t of the liquid lubricant L divided by the upper end of the plate 4a forms a liquid pool d in the gap S between the inner periphery of the magnetic recording medium 100 and the support plate 4a and the liquid draining plate 7a. , Will move downward.
- This liquid pool d is generated by the surface tension of the liquid lubricant L, and is pulled by the liquid surface t of the liquid lubricant L moving downward, and the thickness gradually decreases.
- the size of the liquid pool d can be controlled by the width of the gap S and depends on the viscosity of the liquid lubricant L. Generally, when the width of the gap S is reduced, the liquid pool d is also reduced. Get smaller.
- the residual liquid z that has formed the liquid pool d is pulled to the liquid surface t of the liquid lubricant L, and the magnetic recording medium. It moves to the liquid level t of the liquid lubricant L along the gap S between the inner peripheral portion of 100 and the liquid draining plate 7a. At this time, the generation of wave accompanying the movement of the residual liquid z is suppressed by the liquid cutting plate 7a, and the fluctuation (disturbance) of the liquid level t that occurs at the moment when the liquid level t of the liquid lubricant L is cut can be suppressed low. is there.
- magnetic recording media 100 having an outer diameter of 65 mm, an inner diameter of 20 mm, and a thickness of 0.8 mm are arranged on a support plate 4a (4b) having a thickness of 0.2 mm and a height of 7 mm at intervals of 6.35 mm.
- the analysis model was provided with a slit 6 having a width of 0.3 mm and a depth of 3 mm at the contact position between the inner periphery of the magnetic recording medium and the support plate 4a (4b).
- the dipping apparatus of the present invention is the same as the conventional dipping apparatus except that the gap S between the inner peripheral portion of the magnetic recording medium 100 and the liquid draining plate 7a (7b) is set to 0.5 mm and 1 mm.
- the analysis model was as follows. For the liquid lubricant, the surface tension coefficient was set to 1/10 of water and the contact angle was set to 60 °, and the case where the liquid level t dropped at a speed of 3 mm / second was analyzed.
- the dipping apparatus of the present invention has a fluctuation (disturbance) of the liquid level t that occurs at the moment when the liquid level t of the liquid lubricant L is cut as compared with the conventional dipping apparatus. It can be kept low.
- the graph shown in FIG. 9 is an enlarged view of the vicinity of the liquid breakage point of the graph shown in FIG.
- the surface of the magnetic recording medium is lubricated while preventing the occurrence of linear coating unevenness in the film thickness distribution of the lubricant film formed on the surface of the magnetic recording medium 100. It is possible to form the agent film with a uniform film thickness. By using such a dipping device, it is possible to manufacture a magnetic recording medium suitable for lowering the flying height of the magnetic head and having excellent wear resistance and environmental resistance.
- this invention is not necessarily limited to the thing of the said embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.
- FIG. 10 it is possible to have a configuration in which the middle part to the lower end part of the liquid cutting plates 7 a and 7 b are bent in a direction away from the inner peripheral part of the magnetic recording medium 100.
- the liquid reservoir d formed in the gap S between the inner peripheral portion of the magnetic recording medium 100 and the liquid cutting plates 7a and 7b is the liquid lubricant L that moves downward.
- the thickness is gradually reduced by being pulled by the surface t, the level difference from the liquid level t is reduced while spreading in the lateral direction. It is possible to further reduce the shaking (disturbance).
- Magnetic recording medium Next, a specific configuration of the magnetic recording medium manufactured by using the dipping apparatus of the present invention will be described in detail by taking, for example, the discrete magnetic recording medium 30 shown in FIG.
- the magnetic recording medium 30 illustrated in the following description is only an example, and the magnetic recording medium manufactured by applying the present invention is not necessarily limited to such a configuration, and the gist of the present invention is changed. It is possible to implement by changing as appropriate within the range not to be.
- the magnetic recording medium 30 includes a soft magnetic layer 32, an intermediate layer 33, a recording magnetic layer 34 having a magnetic recording pattern 34a, and a protective layer 35 on both surfaces of a nonmagnetic substrate 31. It has a structure in which layers are sequentially stacked, and further has a structure in which a lubricant film 36 is formed on the outermost surface.
- the soft magnetic layer 32, the intermediate layer 33, and the recording magnetic layer 34 constitute a magnetic layer 37. In FIG. 11, only one surface of the nonmagnetic substrate 31 is illustrated.
- the nonmagnetic substrate 31 examples include an Al alloy substrate mainly composed of Al, such as an Al—Mg alloy, a glass substrate such as soda glass, aluminosilicate glass, or crystallized glass, a silicon substrate, a titanium substrate, a ceramic substrate, Various substrates such as a resin substrate can be mentioned, and among them, an Al alloy substrate, a glass substrate, and a silicon substrate are preferably used. Further, the average surface roughness (Ra) of the nonmagnetic substrate 31 is preferably 1 nm or less, more preferably 0.5 nm or less, and further preferably 0.1 nm or less.
- the soft magnetic layer 32 increases the component in the direction perpendicular to the substrate surface of the magnetic flux generated from the magnetic head, and further strengthens the magnetization direction of the recording magnetic layer 34 on which information is recorded to be more perpendicular to the nonmagnetic substrate 31. It is provided to fix in the direction. This effect becomes more conspicuous particularly when a single pole head for perpendicular recording is used as a magnetic head for recording and reproduction.
- a soft magnetic material containing Fe, Ni, Co, or the like can be used as the soft magnetic layer 32.
- soft magnetic materials include CoFe alloys (CoFeTaZr, CoFeZrNb, etc.), FeCo alloys (FeCo, FeCoV, etc.), FeNi alloys (FeNi, FeNiMo, FeNiCr, FeNiSi, etc.), FeAl alloys (FeAl, etc.).
- the intermediate layer 33 can improve the recording / reproducing characteristics by refining the crystal grains of the magnetic layer.
- a material is not particularly limited, but a material having an hcp structure, an fcc structure, or an amorphous structure is preferable.
- Ru-based alloys, Ni-based alloys, Co-based alloys, Pt-based alloys, and Cu-based alloys are preferable, and these alloys may be multilayered.
- Ni-based alloy it is made of at least one material selected from NiW alloy, NiTa alloy, NiNb alloy, NiTi alloy, NiZr alloy, NiMn alloy, and NiFe alloy containing 33 to 96 at% Ni. Is preferred. Further, it may be a nonmagnetic material containing 33 to 96 at% Ni and containing at least one or more of Sc, Y, Ti, Zr, Hf, Nb, Ta, and C. In this case, the Ni content is preferably in the range of 33 at% to 96 at% in order to maintain the effect as the intermediate layer 33 and to have a range without magnetism.
- the thickness of the intermediate layer 33 is preferably 5 to 40 nm, more preferably 8 to 30 nm as a total thickness in the case of a multilayer.
- the perpendicular orientation of the direct magnetic layer is particularly high, and the distance between the magnetic head and the soft magnetic layer during recording can be reduced. Recording / reproducing characteristics can be improved without lowering.
- the magnetic layer 37 may be a horizontal magnetic layer for an in-plane magnetic recording medium or a perpendicular magnetic layer for a perpendicular magnetic recording medium, but a perpendicular magnetic layer is preferable in order to achieve a higher recording density.
- the magnetic layer 37 is preferably formed from an alloy mainly composed mainly of Co, for example, CoCrPt system, CoCrPtB based magnetic layer and the CoCrPtTa system, these and SiO 2, the oxidation of such Cr 2 O 3
- a magnetic layer having a granular structure to which an object is added can be used.
- a perpendicular magnetic recording medium it is made of, for example, soft magnetic FeCo alloy (FeCoB, FeCoSiB, FeCoZr, FeCoZrB, FeCoZrBCu, etc.), FeTa alloy (FeTaN, FeTaC, etc.), Co alloy (CoTaZr, CoZrNB, CoB, etc.), etc. available soft magnetic layer 32, an intermediate layer 33 made of Ru or the like, a material obtained by laminating a recording magnetic layer 34 made of 60Co-15Cr-15Pt alloy or 70Co-5Cr-15Pt-10SiO 2 alloy. Further, an orientation control film made of Pt, Pd, NiCr, NiFeCr or the like may be laminated between the soft magnetic layer 32 and the intermediate layer 33.
- soft magnetic FeCo alloy FeCoB, FeCoSiB, FeCoZr, FeCoZrB, FeCoZrBCu, etc.
- FeTa alloy FeTaN, FeTaC, etc.
- a nonmagnetic CrMo underlayer and a ferromagnetic CoCrPtTa magnetic layer can be used as the magnetic layer 37.
- the thickness of the recording magnetic layer 34 is 3 nm or more and 20 nm or less, preferably 5 nm or more and 15 nm or less, and may be formed so as to obtain sufficient head input / output according to the type of magnetic alloy used and the laminated structure.
- the magnetic layer 37 needs to have a film thickness of a certain level or more in order to obtain an output of a certain level or more during reproduction, while parameters indicating recording / reproduction characteristics usually deteriorate as the output increases. Therefore, it is necessary to set an optimum film thickness.
- the magnetic layer 37 is usually formed as a thin film by sputtering.
- the granular magnetic recording layer 34 includes at least Co and Cr as magnetic particles, and at least Si oxide, Cr oxide, Ti oxide, W oxide, Co oxide, Ta oxide at the grain boundary portion of the magnetic particles. And those containing at least one or more selected from Ru and Ru oxides. Specifically, for example, CoCrPt—Si oxide, CoCrPt—Cr oxide, CoCrPt—W oxide, CoCrPt—Co oxide, CoCrPt—Cr oxide—W oxide, CoCrPt—Cr oxide—Ru oxide , CoRuPt—Cr oxide—Si oxide, CoCrPtRu—Cr oxide—Si oxide, and the like.
- the average particle size of the magnetic crystal particles having a granular structure is preferably 1 nm or more and 12 nm or less.
- the total amount of oxides present in the magnetic layer is preferably 3 to 15 mol%.
- Examples of the magnetic layer not having a granular structure include a layer using a magnetic alloy containing Co and Cr, and preferably containing Pt.
- the magnetic recording pattern 34 a formed in the recording magnetic layer 34 has a region whose magnetic characteristics are modified (for example, a nonmagnetic region or a recording magnetic layer 34 has a coercive force of about 80%. This is a so-called discrete type magnetic recording medium that is magnetically separated by the lowered region 38).
- the width L1 of the magnetic recording pattern 34a in the recording magnetic layer 34 is 200 nm or less and the width L2 of the modified region 38 is 100 nm or less.
- the protective layer 35 may be made of a material usually used in a magnetic recording medium. Examples of such a material include carbon (C), hydrogenated carbon (HXC), nitrogenated carbon (CN), and alumocarbon. Examples thereof include carbonaceous materials such as silicon carbide (SiC), SiO 2 , Zr 2 O 3 , and TiN.
- the protective layer 35 may be a laminate of two or more layers. If the thickness of the protective layer 35 exceeds 10 nm, the distance between the magnetic head and the magnetic layer 37 increases, and sufficient input / output characteristics cannot be obtained.
- the lubricant film 36 is formed by applying a lubricant composed of a fluorine-based lubricant such as perfluoropolyether, fluorinated alcohol, or fluorinated carboxylic acid, a hydrocarbon-based lubricant, or a mixture thereof on the protective layer 35.
- a lubricant composed of a fluorine-based lubricant such as perfluoropolyether, fluorinated alcohol, or fluorinated carboxylic acid, a hydrocarbon-based lubricant, or a mixture thereof.
- the film thickness of the lubricant film 36 is usually about 1 to 4 nm.
- a chemically stable, low friction and low adsorptive one is preferably used.
- a fluorine resin lubricant such as a perfluoropolyether lubricant containing a compound having a perfluoropolyether structure.
- perfluoropolyether lubricant one kind of perfluoropolyether lubricant may be used, a lubricant combining a cyclic triphosphazene lubricant and a perfluoropolyether lubricant, A lubricant in which a perfluoropolyether compound having a phosphazene ring as a group and a perfluoropolyether compound having a hydroxyl group as a terminal group may be used.
- Examples of the lubricant containing a compound having a perfluoropolyether structure include Fomblin Z-DOL (trade name) and Fomblin Z-TETRAOL (trade name) manufactured by Solvay Solexis.
- Examples of the cyclic triphosphazene lubricant include X-1p (trade name) manufactured by Dow Chemical.
- Examples of the perfluoropolyether compound having a phosphazene ring at the end group include MORESCO PHOSPHAROLA 20H-2000 (trade name) manufactured by Matsumura Oil Research Institute (MORESCO).
- the lubricant thus obtained is dissolved in a solvent to obtain a coating solution (liquid lubricant) having a concentration suitable for the coating method.
- a solvent used here, a fluorine-based solvent or the like is used in the same manner as the solvent for diluting the lubricant described above.
- a dipping method (dip coating method) is used for the coating process.
- a coating solution is placed in a dipping tank of a dip coating apparatus, and a nonmagnetic substrate on which each layer up to the protective layer is formed is dipped in this dipping tank, and then the nonmagnetic substrate is transferred from the dipping tank at a predetermined speed.
- a lubricant film having a uniform film thickness is formed on the surface of the nonmagnetic substrate on the protective layer.
- a magnetic recording / reproducing apparatus to which the present invention is applied includes, for example, as shown in FIG. 12, the magnetic recording medium 30, a rotational drive unit 51 that rotationally drives the magnetic recording medium 30, and a recording operation on the magnetic recording medium 30.
- a magnetic head 52 that performs a reproducing operation, a head drive unit 53 that moves the magnetic head 52 in the radial direction of the magnetic recording medium 30, and a signal input to the magnetic head 52 and an output signal from the magnetic head 52 are reproduced.
- a recording / reproducing signal processing system 54 includes, for example, as shown in FIG. 12, the magnetic recording medium 30, a rotational drive unit 51 that rotationally drives the magnetic recording medium 30, and a recording operation on the magnetic recording medium 30.
- a recording / reproducing signal processing system 54 includes,
- this magnetic recording / reproducing apparatus by using the discrete track type magnetic recording medium 30, it is possible to eliminate writing blur when performing magnetic recording on the magnetic recording medium 30 and to obtain a high surface recording density. That is, by using the magnetic recording medium 30, a magnetic recording / reproducing apparatus having a high recording density can be configured.
- the reproducing head width is made narrower than the recording head width in order to eliminate the influence of the magnetization transition region at the track edge portion. What was supported can be operated with both of them approximately the same width. As a result, sufficient reproduction output and high SNR can be obtained.
- the reproducing unit of the magnetic head 52 by configuring the reproducing unit of the magnetic head 52 with a GMR head or a TMR head, a sufficient signal intensity can be obtained even at a high recording density, and a magnetic recording / reproducing apparatus having a high recording density can be realized. it can. Further, when the flying height of the magnetic head 52 is within the range of 0.005 ⁇ m to 0.020 ⁇ m and the flying height is lower than the conventional height, the output is improved and a high device SNR is obtained, and the large capacity and the high reliability are obtained.
- the magnetic recording / reproducing apparatus can be provided.
- the recording density can be further improved.
- the track density is 100 k tracks / inch or more
- the linear recording density is 1000 k bits / inch or more
- the recording density is 100 G bits or more per square inch.
- a sufficient SNR can also be obtained when recording / reproducing.
- the present invention can be widely applied to a magnetic recording medium having a magnetically separated magnetic recording pattern MP.
- a magnetic recording medium having a magnetic recording pattern the magnetic recording pattern is 1 bit. Examples thereof include so-called patterned media arranged with a certain regularity, media with magnetic recording patterns arranged in a track shape, and other magnetic recording media including servo signal patterns.
- the present invention is preferably applied to a so-called discrete type magnetic recording medium in which magnetically separated magnetic recording patterns are magnetic recording tracks and servo signal patterns, from the viewpoint of simplicity in manufacturing.
- the glass substrate used here is composed of Li 2 Si 2 O 5 , Al 2 O 3 —K 2 O, Al 2 O 3 —K 2 O, MgO—P 2 O 5 , Sb 2 O 3 —ZnO.
- the crystallized glass is made of a material having an outer diameter of 65 mm, an inner diameter of 20 mm, a thickness of 0.8 mm, and an average surface roughness (Ra) of 2 angstroms.
- this glass substrate was subjected to DC sputtering using a FeCoB film having a thickness of 60 nm as a soft magnetic layer, a Ru film having a thickness of 10 nm as an intermediate layer, and a 70Co-5Cr-15Pt-10SiO layer having a thickness of 15 nm as a recording magnetic layer.
- a FeCoB film having a thickness of 60 nm as a soft magnetic layer a Ru film having a thickness of 10 nm as an intermediate layer
- a 70Co-5Cr-15Pt-10SiO layer having a thickness of 15 nm as a recording magnetic layer.
- Two alloy films, a 70Co-5Cr-15Pt alloy film having a thickness of 14 nm, and a CVD carbon film as a protective film were stacked in this order in a thickness of 5 nm.
- Example 1 In Example 1, a lubricant was applied to the magnetic recording medium produced as described above. Specifically, a coating solution in which a lubricant was dissolved in a solvent was applied by a dipping method using a dipping device to form a 1.5 nm lubricant film on the surface of the protective layer of the magnetic recording medium.
- the same device as the dipping device shown in FIGS. 1 to 4 was used. Specifically, a pair of support plates having a thickness of 0.2 mm are provided in parallel at intervals of 5 mm, and magnetic recording media are arranged side by side at intervals of 6.35 mm in the V-shaped groove portions of the pair of support plates. A slit having a width of 0.3 mm and a depth of 0.5 mm was provided at a contact position between the inner peripheral portion of the medium and the support plate. And the liquid cutting plate bent along the inner peripheral part of the magnetic recording medium from the lower end part of the support plate, the gap between the inner peripheral part of the magnetic recording medium and the liquid cutting plate is equally spaced at 0.5 mm. The length of the liquid draining plate was 10 mm.
- Fomblin Z-TETRAOL (trade name) manufactured by Solvay Solexis, which is a compound having a perfluoropolyether structure
- Vertrel XF (trade name) manufactured by Mitsui Dupont Fluoro Chemical Co. was used as a solvent for dissolving the lubricant.
- the concentration of the lubricant in the coating solution was 0.3% by mass, the pulling speed of the magnetic recording medium was 3 mm / second, and the coating film thickness was 15 mm.
- Comparative Example 1 In Comparative Example 1, a lubricant was applied to the magnetic recording medium in the same manner as in Example 1 except that the liquid cutting plate was not provided in the dipping device.
Landscapes
- Manufacturing Of Magnetic Record Carriers (AREA)
- Magnetic Record Carriers (AREA)
- Coating Apparatus (AREA)
Abstract
Description
本願は、2010年1月26日に日本に出願された特願2010-014272号に基づき優先権を主張し、その内容をここに援用する。
(1) 中心孔を有する円盤状の磁気記録媒体を液体潤滑剤の入った浸漬槽に浸漬した後、この浸漬槽から磁気記録媒体を引き上げることによって、磁気記録媒体の表面に潤滑剤膜を形成する磁気記録媒体の製造装置であって、
前記磁気記録媒体の中心孔に挿通されて当該磁気記録媒体を吊り下げた状態で支持するハンガー機構と、
前記ハンガー機構と前記浸漬槽との何れか一方を他方に対して昇降操作する昇降機構とを備え、
前記ハンガー機構は、上端部が前記磁気記録媒体の内周部と当接される支持プレートと、前記支持プレートの下端部から延長して設けられて前記磁気記録媒体の内周部との間に当該内周部に沿った隙間を形成する液切プレートとを有することを特徴とする磁気記録媒体の製造装置。
(2) 前記ハンガー機構は、上端部が前記磁気記録媒体の内周部と当接される一対の支持プレートと、前記一対の支持プレートの下端部から互いに逆向きに延長して設けられて前記磁気記録媒体の内周部との間に当該内周部に沿った隙間を形成する一対の液切プレートとを有することを特徴とする前記(1)に記載の磁気記録媒体の製造装置。
(3) 前記液切プレートは、その中途部から下端部に亘って前記磁気記録媒体の内周部から離間する方向に折り曲げられていることを特徴とする前記(1)又は(2)に記載の磁気記録媒体の製造装置。
(4) 前記液切プレートの下端部は、前記磁気記録媒体の内周部との間の隙間に溜まった液溜まりが液切れする位置よりも下方に位置することを特徴とする前記(1)~(3)の何れか一項に記載の磁気記録媒体の製造装置。
(5) 前記支持プレートの上端部には、前記磁気記録媒体の内周部が係合される溝部が設けられていることを特徴とする前記(1)~(4)の何れか一項に記載の磁気記録媒体の製造装置。
(6) 前記溝部の底部には、前記支持プレートを鉛直下向きに切り欠くスリットが設けられていることを特徴とする前記(5)に記載の磁気記録媒体の製造装置。
(7) 前記ハンガー機構は、前記磁気記録媒体を複数並べた状態で支持することを特徴とする前記(1)~(6)の何れか一項に記載の磁気記録媒体の製造装置。
(8) 中心孔を有する円盤状の磁気記録媒体の中心孔にハンガー機構を挿通して当該磁気記録媒体を吊り下げた状態で支持しながら磁気記録媒体を液体潤滑剤の入った浸漬槽に浸漬した後、この浸漬槽から磁気記録媒体を引き上げることによって、磁気記録媒体の表面に潤滑剤膜を形成する磁気記録媒体の製造方法であって、前記ハンガー機構を、その上端部が前記磁気記録媒体の内周部と当接される支持プレートと、前記支持プレートの下端部から延長して設けられて前記磁気記録媒体の内周部との間に当該内周部に沿った隙間を形成する液切プレートとを有する構造とすることを特徴とする磁気記録媒体の製造方法。
(磁気記録媒体の製造装置)
本発明を適用した磁気記録媒体の製造装置は、例えば図1に示すように、中心孔100aを有する円盤状の磁気記録媒体100を液体潤滑剤Lの入った浸漬槽1に浸漬した後、この浸漬槽1から磁気記録媒体100を引き上げることによって、磁気記録媒体100の表面に潤滑剤膜を形成する、いわゆるディッピング装置である。
例えば、図10に示すように、上記液切プレート7a,7bの中途部から下端部までを磁気記録媒体100の内周部から離間する方向に折り曲げた構成とすることも可能である。このような構成を採用した場合、磁気記録媒体100の内周部と液切プレート7a,7bとの間の隙間Sに形成された液溜まりdは、下方へと移動する液体潤滑剤Lの液面tに引っ張られて、その厚みが徐々に薄くなるとき、横方向に広がりながら液面tとの段差を小さくしていくため、液体潤滑剤Lの液面tが切れる瞬間に生じる液面tの揺れ(乱れ)を更に低く抑えることが可能となる。
次に、本発明のディッピング装置を用いて製造される磁気記録媒体の具体的な構成について、例えば図11に示すディスクリート型の磁気記録媒体30を例に挙げて詳細に説明する。
以下の説明において例示される磁気記録媒体30はほんの一例であり、本発明を適用して製造される磁気記録媒体は、そのような構成に必ずしも限定されるものではなく、本発明の要旨を変更しない範囲で適宜変更して実施することが可能である。
次に、本発明を適用した磁気記録再生装置(HDD)について説明する。
本発明を適用した磁気記録再生装置は、例えば図12に示すように、上記磁気記録媒体30と、上記磁気記録媒体30を回転駆動する回転駆動部51と、上記磁気記録媒体30に対する記録動作と再生動作とを行う磁気ヘッド52と、磁気ヘッド52を上記磁気記録媒体30の径方向に移動させるヘッド駆動部53と、磁気ヘッド52への信号入力と磁気ヘッド52から出力信号の再生とを行うための記録再生信号処理系54とを備えている。
本実施例では、先ず、HD用ガラス基板をセットした真空チャンバを予め1.0×10-5Pa以下に真空排気した。ここで使用したガラス基板は、Li2Si2O5、Al2O3-K2O、Al2O3-K2O、MgO-P2O5、Sb2O3-ZnOを構成成分とする結晶化ガラスを材質とし、外径が65mm、内径が20mm、厚み0.8mm、平均表面粗さ(Ra)が2オングストロームである。
実施例1では、以上のように作製された磁気記録媒体について潤滑剤を塗布した。具体的には、潤滑剤が溶剤に溶解された塗布溶液を、ディッピング装置を用いてディップ法で塗布し、磁気記録媒体の保護層の表面に1.5nmの潤滑剤膜を形成した。
比較例1では、上記ディッピング装置において液切プレートを設けなかった以外は、実施例1と同様に磁気記録媒体に潤滑剤を塗布した。
以上のように作製された実施例1及び比較例1の磁気記録媒体の潤滑剤膜の膜厚分布を測定した。膜厚分布の測定には、光学式表面検査装置、KLA-Tencor社(米国)製のCandela 6100(商品名)を使用した。
Claims (8)
- 中心孔を有する円盤状の磁気記録媒体を液体潤滑剤の入った浸漬槽に浸漬した後、この浸漬槽から磁気記録媒体を引き上げることによって、磁気記録媒体の表面に潤滑剤膜を形成する磁気記録媒体の製造装置であって、
前記磁気記録媒体の中心孔に挿通されて当該磁気記録媒体を吊り下げた状態で支持するハンガー機構と、
前記ハンガー機構と前記浸漬槽との何れか一方を他方に対して昇降操作する昇降機構とを備え、
前記ハンガー機構は、上端部が前記磁気記録媒体の内周部と当接される支持プレートと、前記支持プレートの下端部から延長して設けられて前記磁気記録媒体の内周部との間に当該内周部に沿った隙間を形成する液切プレートとを有することを特徴とする磁気記録媒体の製造装置。 - 前記ハンガー機構は、上端部が前記磁気記録媒体の内周部と当接される一対の支持プレートと、前記一対の支持プレートの下端部から互いに逆向きに延長して設けられて前記磁気記録媒体の内周部との間に当該内周部に沿った隙間を形成する一対の液切プレートとを有することを特徴とする請求項1に記載の磁気記録媒体の製造装置。
- 前記液切プレートは、その中途部から下端部に亘って前記磁気記録媒体の内周部から離間する方向に折り曲げられていることを特徴とする請求項1又は2に記載の磁気記録媒体の製造装置。
- 前記液切プレートの下端部は、前記磁気記録媒体の内周部との間の隙間に溜まった液溜まりが液切れする位置よりも下方に位置することを特徴とする請求項1又は2に記載の磁気記録媒体の製造装置。
- 前記支持プレートの上端部には、前記磁気記録媒体の内周部が係合される溝部が設けられていることを特徴とする請求項1又は2に記載の磁気記録媒体の製造装置。
- 前記溝部の底部には、前記支持プレートを鉛直下向きに切り欠くスリットが設けられていることを特徴とする請求項5に記載の磁気記録媒体の製造装置。
- 前記ハンガー機構は、前記磁気記録媒体を複数並べた状態で支持することを特徴とする請求項1又は2に記載の磁気記録媒体の製造装置。
- 中心孔を有する円盤状の磁気記録媒体の中心孔にハンガー機構を挿通して当該磁気記録媒体を吊り下げた状態で支持しながら磁気記録媒体を液体潤滑剤の入った浸漬槽に浸漬した後、この浸漬槽から磁気記録媒体を引き上げることによって、磁気記録媒体の表面に潤滑剤膜を形成する磁気記録媒体の製造方法であって、
前記ハンガー機構を、その上端部が前記磁気記録媒体の内周部と当接される支持プレートと、前記支持プレートの下端部から延長して設けられて前記磁気記録媒体の内周部との間に当該内周部に沿った隙間を形成する液切プレートとを有する構造とすることを特徴とする磁気記録媒体の製造方法。
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