WO2009096420A1 - 凹凸パターン形成方法、およびそれを利用した磁気記録媒体の製造方法 - Google Patents
凹凸パターン形成方法、およびそれを利用した磁気記録媒体の製造方法 Download PDFInfo
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- WO2009096420A1 WO2009096420A1 PCT/JP2009/051342 JP2009051342W WO2009096420A1 WO 2009096420 A1 WO2009096420 A1 WO 2009096420A1 JP 2009051342 W JP2009051342 W JP 2009051342W WO 2009096420 A1 WO2009096420 A1 WO 2009096420A1
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- Prior art keywords
- thin film
- concavo
- convex pattern
- forming
- magnetic recording
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Images
Classifications
-
- 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
- G11B5/855—Coating only part of a support with a magnetic layer
Definitions
- the present invention relates to a method for forming a concavo-convex pattern using a specific concavo-convex pattern forming material and a method for producing a magnetic recording medium using the concavo-convex pattern formed by the method for forming the concavo-convex pattern.
- the following techniques are well known as a method for forming an uneven microstructure on the surface of a material to be processed with high throughput.
- the uneven pattern is transferred to the film by embossing the film with a mold having an uneven pattern.
- the workpiece material is processed using a concavo-convex pattern made of the film formed thereby as a resist.
- the material to be processed is a material for forming a concavo-convex pattern.
- a substrate such as a glass plate, a substrate on which a magnetic film or a protective film is formed, or a substrate or a substrate subjected to masking treatment Etc.
- thermoplastic polymer such as polymethyl methacrylate (PMMA) has been used as the material for forming the concavo-convex pattern, that is, a resist (a method proposed by Steohen Y. Chou et al., See Non-Patent Document 1).
- PMMA polymethyl methacrylate
- nanoimprinting using this resist forming material requires heating at the time of stamping, and there is a problem that the position and line width of the transferred pattern after stamping change due to temperature changes when cooling after stamping. .
- the nanoimprint has a process of heating and cooling, so that the workability is not so good.
- the resist forming material adheres to the mold (embossing) mask in the transfer process, and the pattern transfer accuracy is lowered. It was.
- hydrogenated silsesquioxane which is one of the siloxane compounds, is used as a resist forming material. After the coating film is formed on the substrate, it is embossed at room temperature, and the hydrogenated silsesquioxane is further hydrolyzed.
- a technique for obtaining a fine concavo-convex pattern by decomposing and hardening has been developed (see Patent Document 1).
- a technology has been developed to obtain a fine concavo-convex pattern by forming a coating film comprising a composition containing a catechol derivative and a resorcinol derivative on a substrate, then embossing at room temperature, and further curing the composition. (See Patent Document 2).
- the former method using silsesquioxane hydride has a drawback that it is very difficult to use industrially to produce a fine concavo-convex pattern (resist). This is because hydrogenated silsesquioxane is unstable and thus has a short life as a coating solution, and also has a short usable time after being applied to a substrate and drying the solvent.
- the latter method using an organic material has a drawback that a composition containing a catechol derivative and a resorcinol derivative has low resistance to oxygen, and is particularly restricted in processing a magnetic medium having high resistance to etching by oxygen gas. is there.
- a dry etching method or the like is known as a method for transferring the resist pattern formed by the nanoimprint to a magnetic film.
- the dry etching method is a method of selectively removing part or all of a portion of a substrate on which a resist is not formed by spraying an etching gas on the substrate on which a resist pattern is formed, for example. Since there is a difference in the ease of removal of the resist and the substrate by the etching gas, such removal is possible. That is, the resist is difficult to remove and the substrate is easy to remove.
- the magnetic film is made of a metal oxide that is highly resistant to etching gas (usually oxygen gas). Even if sesquioxane or the like is used, there is a problem that the uneven shape of the resist, that is, the rectangle is deformed, and the patterning of the magnetic film cannot be performed cleanly.
- an object of the present invention is to provide the following two methods.
- (1) A method for forming a concavo-convex pattern that can be imprinted (embossed) at room temperature with good rectangularity, using a resist forming material that has excellent oxygen etching resistance and a long pot life.
- (2) A method of manufacturing a magnetic recording medium that can perform patterning with good rectangularity on a workpiece such as a substrate provided with a magnetic film, using the uneven pattern formed by the method of (1).
- the present inventors include a silsesquioxane compound having a specific weight average molecular weight represented by a composition formula of R 1 R 2 Si 2 O 3. It has been found that the solution can solve the above problems (1) and (2).
- the magnetic film is highly resistant to ion etching, so that the concavo-convex pattern having good rectangularity is formed on the magnetic film.
- it is difficult to form a pattern consisting of a resist and carbon thin film on the magnetic film by oxygen etching in advance by introducing a carbon thin film having high ion milling resistance onto the magnetic film the magnetic film has good rectangularity.
- the present inventors have also found that an uneven pattern can be formed.
- the present invention is as described in the following [1] to [13].
- a solution containing a silsesquioxane compound represented by the following composition formula (A) and having a weight average molecular weight of 10,000 or more in terms of standard polystyrene measured by gel permeation chromatography is applied to the surface of the work material. And forming a thin film (1), A step (2) of pressing a master having an uneven pattern on the thin film; And a step (3) of peeling the master from the thin film.
- R 1 R 2 Si 2 O 3 composition formula (A) (In the above compositional formula (A), R 1 and R 2 are each independently an optionally substituted alkyl group having 1 to 8 carbon atoms, an optionally substituted alkenyl group having 2 to 8 carbon atoms, and a substituted group. Represents an optionally substituted alkoxy group having 1 to 6 carbon atoms or an optionally substituted aryl group having 6 to 10 carbon atoms).
- R 1 and R 2 are each independently an optionally substituted alkyl group having 1 to 8 carbon atoms, an optionally substituted alkenyl group having 2 to 8 carbon atoms, Represents an optionally substituted alkoxy group having 1 to 6 carbon atoms or an optionally substituted aryl group having 6 to 10 carbon atoms).
- [8] Forming a concavo-convex pattern made of a thin film on the magnetic film by the method for forming a concavo-convex pattern according to any one of [1] to [7] using a substrate having a magnetic film on a substrate as a material to be processed And Removing the thin film present at the bottom of the concave portion of the concave-convex pattern;
- a method of manufacturing a concavo-convex patterned magnetic recording medium comprising a step of removing at least a part of the magnetic film present at the bottom of the concave portion exposed by the removal.
- a magnetic recording / reproducing apparatus comprising the magnetic recording medium according to [12].
- the solution containing the silsesquioxane compound since the solution containing the silsesquioxane compound has a long pot life, the solution is applied to the surface of the material to be processed to form a thin film, and then a long time at room temperature. Even if the mold is pressed after being allowed to stand for a long time, an uneven pattern with good rectangularity can be transferred to the thin film.
- a magnetic recording medium of the present invention it is possible to perform patterning with good rectangularity on a material to be processed such as a substrate provided with a magnetic film.
- the etching gas is, for example, a fluorine-based gas
- the etching gas is, for example, an oxygen gas.
- corrugated pattern formation method with respect to a desirable magnetic film, when a workpiece material is a board
- the etching gas is, for example, a fluorine-based gas
- the etching gas is, for example, an oxygen gas.
- SR-20 weight average molecular weight 5470
- SR-20 weight average molecular weight 16900
- FIG. 4 It is a figure which shows the cross-sectional SEM image of the board
- a solution containing polydiphenylsilsesquioxane is applied to the surface of the material to be processed to form a thin film, and a concavo-convex pattern is transferred to the thin film by a stamper.
- corrugated pattern formation method of this invention covers the solution containing the silsesquioxane compound whose weight average molecular weight of the standard polystyrene conversion measured by the gel permeation chromatography represented by the following compositional formula (A) is 10,000 or more.
- a good aryl group having 6 or 7 carbon atoms is preferred,
- An alkyl group having 1 to 4 carbon atoms, an alkenyl group having 2 to 4 carbon atoms, or an aryl group having 6 or 7 carbon atoms is more preferable from the viewpoint of fluidity of the solution and rectangularity of the uneven pattern.
- Examples of the substituent in the optionally substituted alkyl group having 1 to 8 carbon atoms include a halogen atom and a hydroxyl group.
- Examples of the alkyl group having 1 to 8 carbon atoms include a methyl group, an ethyl group, a propyl group, and a butyl group.
- Examples of the alkenyl group having 2 to 8 carbon atoms include a vinyl group, an allyl group, and a butenyl group.
- Examples of the alkoxy group having 1 to 6 carbon atoms include a methoxy group and an ethoxy group.
- Examples of the aryl group having 6 to 10 carbon atoms include a phenyl group and a tolyl group.
- a phenyl group and a methyl group are particularly preferable from the viewpoint of the ability to hold a thin film rectangle during embossing.
- the silsesquioxane compound has a weight average molecular weight in terms of standard polystyrene measured by gel permeation chromatography (GPC) of 10,000 or more, preferably 30000 or less, more preferably 12000 or more and 25000 or less, and still more preferably. Is 15000 or more and 20000 or less.
- GPC gel permeation chromatography
- the viscosity of the solution containing the silsesquioxane compound will increase and the fluidity will decrease, so excessive pressure will be required when embossing with the master and the life of the master (stamper) will be shortened. It may end up.
- the silsesquioxane compound is preferably composed of a repeating unit having a structure represented by the following formula (B) from the viewpoint of fluidity of the solution containing the silsesquioxane compound and rectangularity of the uneven pattern. .
- R 1 and R 2 have the same meanings as R 1 and R 2 in formula (A). That is, R 1 and R 2 are each independently an optionally substituted alkyl group having 1 to 8 carbon atoms, an optionally substituted alkenyl group having 2 to 8 carbon atoms, or an optionally substituted carbon number 1 Represents an alkoxy group having 6 to 6 atoms or an aryl group having 6 to 10 carbon atoms which may be substituted; These examples and preferred ones are also as described for R 1 and R 2 in the composition formula (A).
- an alkali metal carboxylate and a lower alcohol are dissolved in a mixed solution in which two layers of water and an organic solvent are formed, and methyltrichlorosilane is dropped into the system to hydrolyze the methyltrichlorosilane, followed by further hydrolysis.
- a decomposition product can be condensed to synthesize polymethylsilsesquioxane (see Japanese Patent No. 2977218).
- a polyphenylsilsesquioxane can be synthesized by condensing a prepolymer or phenylsilanetriol (see Japanese Patent Publication No. 3-60336 and Japanese Patent Application Laid-Open No. 8-143578).
- an alkali metal carboxylate and a lower aliphatic alcohol are dissolved in a mixed solution in which two layers of water and an organic solvent are formed, and phenyltrichlorosilane is dropped into this system to be hydrolyzed and further condensed.
- phenyltrichlorosilane is dropped into this system to be hydrolyzed and further condensed.
- a prepolymer obtained by hydrolyzing methyltriethoxysilane and phenyltrimethoxysilane in the presence of an acidic catalyst is condensed in a methyl isobutyl ketone solvent in the presence of a basic catalyst to produce an ultrahigh molecular weight polymethyl ester.
- Phenyl silsesquioxane can be synthesized (see Japanese Patent No. 3272002).
- the silsesquioxane compound used in the method for forming a concavo-convex pattern according to the present invention can be produced by various known methods and is also commercially available.
- the compound When forming a fine concavo-convex pattern using these compounds, the compound is dissolved in a solvent to form a solution, which is applied to the surface of the work material by a method such as spin coating or dip coating.
- the solvent include ketone solvents such as methyl isobutyl ketone and cyclohexanone, Aromatic hydrocarbon solvents such as toluene and xylene, Ester solvents such as ethyl acetate, butyl acetate, propylene glycol monomethyl ether acetate, Examples include alcohol solvents such as 2-propanol, butanol, hexanol, propylene glycol mono-n-propyl ether, and ethylene glycol monoethyl ether.
- the amount of the solvent used is such that the silsesquioxane compound is usually 1 to 40% by mass, preferably 3 to 6% by mass with respect to 100% by mass of the solvent.
- the concavo-convex pattern forming method of the present invention can carry out all the steps at room temperature, and also described in Patent Documents 1 and 2. Since it is not necessary to carry out the curing reaction required by the method, workability is good.
- the thin film used as a resist, which is formed by this method is highly resistant to oxygen etching, and has a long pot life, so even if it is left at room temperature for a long time after forming the thin film, it has good rectangularity. A pattern can be formed.
- the method for forming a concavo-convex pattern according to the present invention includes a step of applying a solution containing the specific silsesquioxane compound to the surface of a material to be processed to form a thin film (application step), and a master having a concavo-convex pattern on the thin film. It has a process of pressing (transfer process) and a process of peeling the master from the thin film (peeling process).
- a solution containing the silsesquioxane compound is applied to a work material such as a substrate to form a thin film on the work material surface.
- a work material such as a substrate
- a thin film forming method include spin coating and dip coating, but it is preferable to appropriately select a method in which the thickness of the thin film on the substrate is uniform. Further, it is desirable to select a solvent having a boiling point as a solvent of the solution so that it is not necessary to perform a prebake treatment after the application according to each application method.
- the concavo-convex pattern is transferred to the thin film by pressing the master (mold with concavo-convex pattern) on the thin film formed in the coating process under pressure at room temperature without any special treatment such as pre-baking.
- the FIG. 1B shows a process of pressing the master against the thin film formed in the coating process.
- normal temperature means a temperature range of 0 to 50 ° C.
- this transfer step is particularly preferably carried out at a temperature of 10 to 40 ° C. This step can usually be performed in air.
- the pressure is usually 100 to 250 MPa, more preferably 140 to 180 MPa. If the pressure is too low, transfer may be insufficient. On the other hand, if it is too high, the life of the master may be shortened, which is not economical.
- a fine concavo-convex pattern can be formed on the thin film by the above operation.
- the fine uneven pattern is a pattern in which the line width dimension of the unevenness formed on the thin film is 10 ⁇ m or less, that is, a pattern in which the sum of one concave line width and one convex line width is 10 ⁇ m or less. Means.
- FIG. 1C shows a process of peeling the master from the thin film.
- the thin film having the concavo-convex pattern transferred thereon can be used as a resist.
- a fluorine-based etching gas such as CF 4 or SF 6
- the remaining film at the bottom of the pattern recess is removed (residual film processing), and only the bottom of the recess is processed.
- the pattern of the master can be transferred to the material to be processed by performing etching according to the characteristics of the material to be processed.
- FIG. 2A shows the remaining film treatment
- FIG. 2B shows the step of etching the material to be processed.
- a solution containing a specific silsesquioxane compound is applied to a surface of a work material to form a thin film on the surface of the work material, and a master is formed on the thin film.
- a concave / convex pattern with good rectangularity can be formed on the thin film.
- oxygen etching or the like is sufficient for etching the work material.
- the work material is a magnetic material in which a magnetic film is formed on a base such as a hard disk substrate, such work material is Since the resistance to various etching gases is high, it may be difficult to form a concavo-convex pattern on the work material with good rectangularity by the above method.
- a carbon thin film such as diamond-like carbon
- Such a carbon thin film can be formed in advance on the magnetic film by a known method such as a known CVD method or PVD method.
- the concave and convex pattern is formed on the material to be processed (magnetic film) with good rectangularity by performing the following steps until the remaining film treatment, and then performing the following steps. Can be formed.
- the thin film formed on the carbon thin film has excellent oxygen etching resistance, while the carbon thin film has low oxygen etching resistance, so by performing oxygen etching on the thin film and the carbon thin film after performing the residual film treatment, It is possible to selectively remove the carbon thin film that is not covered with the thin film, that is, exposed by the residual film treatment and that exists at the bottom of the concave portion.
- FIG. 3B shows the process.
- the thickness of the carbon thin film is usually 10 to 30 nm.
- ⁇ Magnetic film removal process By performing a process such as ion milling after the carbon thin film removing step, the portion of the material to be processed (magnetic film) that is not covered with the carbon thin film, that is, exposed by the oxygen etching, is present at the bottom of the concave portion. It can be selectively removed. This is because the diamond-like carbon constituting the carbon thin film has high resistance to ion milling, and the magnetic film has low resistance to ion milling. In this way, a concavo-convex pattern can be formed on the substrate. The thin film (resist) is also removed by ion milling. FIG. 3C shows this process.
- the carbon thin film can be easily removed by ion etching with oxygen gas after patterning of the workpiece material, the carbon thin film is a preferable material as a mask for patterning the magnetic material.
- the magnetic recording medium obtained by the method of manufacturing a magnetic recording medium having a concavo-convex pattern according to the present invention can be applied to various known applications, for example, can be provided in a magnetic recording / reproducing apparatus.
- polydiphenylsilsesquioxane (SR-20, manufactured by Konishi Chemical Co., Ltd.), which is a compound comprising a repeating unit having the structure represented by the formula (B) described above, wherein R 1 and R 2 are phenyl groups
- R 1 and R 2 are phenyl groups
- Two types having different average molecular weights were prepared (two types having weight average molecular weights of 5470 and 16900 in terms of standard polystyrene measured by GPC).
- a 5% solution of each propylene glycol monomethyl ether acetate (manufactured by Daicel Chemical Industries, Ltd.) was prepared and used as a resist solution.
- a substrate provided with a magnetic film on a base was prepared, and a carbon thin film was formed on the surface of the substrate, that is, the magnetic film with a thickness of about 10 nm, and this was used as a material to be processed.
- the resist solution was spin-coated on the surface of the material to be processed, that is, on the carbon thin film so as to have a thickness of about 100 nm.
- a stamper made of nickel having a concavo-convex pattern with a concave and convex width of about 50 to 100 nm and a depth of about 50 nm is pressed onto this thin film for 60 seconds at room temperature and about 180 MPa using a pressing device. did. After pressing, the stamper was peeled off, and it was confirmed that the uneven pattern of the stamper was transferred to the surface of the material to be processed (see FIG. 4).
- the shape of the concavo-convex pattern obtained by pressing a stamper under the same conditions as described above after 20 minutes have passed after spin coating a solution containing silsesquioxane hydride in an organic solvent on the surface of the work material. As shown in FIG.
- CF 4 residual film processing
- O 2 carbon thin film processing
- CF 4 and O 2 carbon thin film processing
- a discrete track medium magnetic recording medium
- the cross-sectional shape after transferring the concavo-convex pattern to a thin film with a stamper and the cross-sectional shape after oxygen etching after ion milling are greatly different, and the concavo-convex pattern of the magnetic recording medium is rectangular. Not good.
- the cross-sectional shape after transferring the concavo-convex pattern to the thin film with a stamper and the cross-sectional shape after oxygen etching after ion milling are approximately the same, and magnetic recording The rectangularity of the uneven pattern of the medium is good.
- the solution containing the silsesquioxane compound represented by the composition formula (A) having a weight average molecular weight of less than 10,000 can form a concavo-convex pattern having good rectangularity on the substrate and can be used. Although the time is long, with this solution, it is not possible to obtain a magnetic recording medium having a concavo-convex pattern with good rectangularity, which is a target product in the actual industry.
Landscapes
- Manufacturing Of Magnetic Record Carriers (AREA)
- Exposure Of Semiconductors, Excluding Electron Or Ion Beam Exposure (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
- Treatments Of Macromolecular Shaped Articles (AREA)
- Magnetic Record Carriers (AREA)
Abstract
Description
Appl.Phys. Lett., Vol.76, p.3114(1995)
(1)酸素エッチング耐性が優れ且つ可使時間の長いレジスト形成材料を用いた、矩形性良く常温でインプリント(型押し)を行うことができる凹凸パターン形成方法。
(2)(1)の方法により形成された凹凸パターンを用いた、磁性膜を備えた基板等の被加工材料に矩形性の良いパターニングを行うことができる磁気記録媒体の製造方法。
その薄膜に凹凸パターンを有する原盤を押し付ける工程(2)と、
前記原盤を前記薄膜から剥離する工程(3)と
を有することを特徴とする凹凸パターン形成方法:
R1R2Si2O3 組成式(A)
(上記組成式(A)において、R1およびR2はそれぞれ独立に、置換されていてもよい炭素数1~8のアルキル基、置換されていてもよい炭素数2~8のアルケニル基、置換されていてもよい炭素数1~6のアルコキシ基または置換されていてもよい炭素数6~10のアリール基を表す。)。
該凹凸パターンの凹部分の底部に存在する前記薄膜を除去し、
その除去により露出した、前記凹部分の底部に存在する前記磁性膜の少なくとも一部を除去する工程を有することを特徴とする凹凸パターン化された磁気記録媒体の製造方法。
該凹凸パターンの凹部分の底部に存在する前記薄膜を除去し、
その除去により露出した、前記凹部分の底部に存在する前記炭素薄膜を除去し、
炭素薄膜の除去により露出した、前記凹部分の底部に存在する前記磁性膜の少なくとも一部を除去する工程を有することを特徴とする凹凸パターン化された磁気記録媒体の製造方法。
前記磁性膜の除去をイオンミリングにより行うことを特徴とする[9]に記載の凹凸パターン化された磁気記録媒体の製造方法。
14 薄膜
16 被加工材料
18 凹凸パターンが転写された薄膜
20 エッチングガス
22 イオンミリング
24 炭素薄膜
まず前記シルセスキオキサン化合物を含む溶液について説明する。
本発明の凹凸パターン形成方法で使用される溶液は、特定のシルセスキオキサン化合物を含み、そのシルセスキオキサン化合物は以下の組成式(A)で表される。
上記組成式(A)において、
R1及びR2はそれぞれ独立に、置換されていてもよい炭素数1~8のアルキル基、置換されていてもよい炭素数2~8のアルケニル基、置換されていてもよい炭素数1~6のアルコキシ基または置換されていてもよい炭素数6~10のアリール基を表し、
置換されていてもよい炭素数1~4のアルキル基、置換されていてもよい炭素数2~4のアルケニル基、置換されていてもよい炭素数1もしくは2のアルコキシ基または置換されていてもよい炭素数6もしくは7のアリール基が好ましく、
炭素数1~4のアルキル基、炭素数2~4のアルケニル基または炭素数6もしくは7のアリール基が前記溶液の流動性及び凹凸パターンの矩形性保持の点からより好ましい。
炭素数2~8のアルケニル基としてはビニル基、アリル基およびブテニル基を例示でき、
炭素数1~6のアルコキシ基としては、メトキシ基およびエトキシ基を例示でき、
炭素数6~10のアリール基としてはフェニル基およびトリル基を例示できる。
トルエンおよびキシレンなどの芳香族炭化水素溶媒、
酢酸エチル、酢酸ブチル、プロピレングリコールモノメチルエーテルアセテートなどのエステル系溶媒、
2-プロパノール、ブタノール、ヘキサノール、プロピレングリコールモノ-n-プロピルエーテル、エチレングリコールモノエチルエーテル等のアルコール系溶媒などを挙げることができる。
次に、本発明の凹凸パターン形成方法について説明する。
まず、基板などの被加工材料に上記シルセスキオキサン化合物を含む溶液を塗布して被加工材料表面上に薄膜を形成する。薄膜形成方法としては、スピンコートやディップコートなどを例示することができるが、基板上の薄膜の膜厚が均一になる方法を適宜選択することが好ましい。また、それぞれの塗布方法に応じて、塗布後にプリベーク等の処理を行わずに済むような沸点を持つ溶媒を前記溶液の溶媒として選択することが望ましい。
凹凸パターンは、塗布膜に対してプリベーク等の処理を特に行うことなく、原盤(凹凸パターンを有する型)を塗布工程で形成された薄膜に、常温で圧力をかけて押し付けることで薄膜に転写される。図1(b)は、塗布工程で形成された薄膜に原盤を押し付ける工程を示している。
原盤の凹凸パターンを薄膜に転写した後に、原盤を薄膜から剥離する。図1(c)は、原盤を薄膜から剥離する工程を示している。
前記炭素薄膜上に形成された薄膜は酸素エッチング耐性が優れており、一方炭素薄膜は酸素エッチング耐性が低いので、残膜処理を施した後に薄膜および炭素薄膜に対して酸素エッチングをすることにより、薄膜に覆われていない、すなわち残膜処理により露出した、凹部分の底部に存在する炭素薄膜を選択的に除去することができる。図3(b)にその工程を示す。なお、炭素薄膜の厚さは通常10~30nmである。
前記炭素薄膜除去工程の後にイオンミリング等の処理を施すことにより、炭素薄膜で覆われていない、すなわち前記酸素エッチングにより露出した、凹部分の底部に存在する被加工材料(磁性膜)の部分を選択的に除去することができる。これは、炭素薄膜を構成するダイヤモンドライクカーボンがイオンミリングに対して耐性が高く、磁性膜がイオンミリングに対して耐性が低いからである。このようにして基板に凹凸パターンを形成させることができる。なお、薄膜(レジスト)もイオンミリングで除去される。図3(c)にこの工程を示す。
以下実施例および比較例により本発明を更に具体的に説明するが、本発明は以下の実施例にのみ制限されるものではない。
(1)前者(重量平均分子量5470)では、薄膜にスタンパーにより凹凸パターンを転写した後の断面形状とイオンミリングの後の酸素エッチング後の断面形状とが大きく異なり、磁気記録媒体の凹凸パターンの矩形性が良くない。
(2)後者(重量平均分子量16900)では、薄膜にスタンパーにより凹凸パターンを転写した後の断面形状とイオンミリングの後の酸素エッチング後の断面形状とが概ね同等の形状となっており、磁気記録媒体の凹凸パターンの矩形性が良い。
Claims (13)
- 下記組成式(A)で表される、ゲルパーミエーションクロマトグラフィーにより測定した標準ポリスチレン換算の重量平均分子量が10000以上であるシルセスキオキサン化合物を含む溶液を、被加工材料表面に塗布して薄膜を形成する工程(1)と、
その薄膜に凹凸パターンを有する原盤を押し付ける工程(2)と、
前記原盤を前記薄膜から剥離する工程(3)と
を有することを特徴とする凹凸パターン形成方法:
R1R2Si2O3 組成式(A)
(上記組成式(A)において、R1およびR2はそれぞれ独立に、置換されていてもよい炭素数1~8のアルキル基、置換されていてもよい炭素数2~8のアルケニル基、置換されていてもよい炭素数1~6のアルコキシ基または置換されていてもよい炭素数6~10のアリール基を表す。)。 - 前記工程(2)を、10~40℃の温度で行うことを特徴とする請求項1に記載の凹凸パターン形成方法。
- 前記工程(2)において、原盤を押し付ける圧力が100~250MPaであることを特徴とする請求項1または2に記載の凹凸パターン形成方法。
- 前記式(B)のR1及びR2がそれぞれ独立にメチル基またはフェニル基であることを特徴とする請求項4に記載の凹凸パターン形成方法。
- 前記シルセスキオキサン化合物のゲルパーミエーションクロマトグラフィーにより測定した標準ポリスチレン換算の重量平均分子量が10000~30000であることを特徴とする請求項1~5のいずれかに記載の凹凸パターン形成方法。
- 前記シルセスキオキサン化合物がポリジフェニルシルセスキオキサンであることを特徴とする請求項1~6のいずれかに記載の凹凸パターン形成方法。
- 基体上に磁性膜を備えた基板を被加工材料として用いた請求項1~7のいずれかに記載の凹凸パターン形成方法により、該磁性膜上に薄膜からなる凹凸パターンを形成し、
該凹凸パターンの凹部分の底部に存在する前記薄膜を除去し、
その除去により露出した、前記凹部分の底部に存在する前記磁性膜の少なくとも一部を除去する工程を有することを特徴とする凹凸パターン化された磁気記録媒体の製造方法。 - 基体、磁性膜、炭素薄膜がこの順に積層された基板を被加工材料として用いた請求項1~7のいずれかに記載の凹凸パターン形成方法により、該炭素薄膜上に薄膜からなる凹凸パターンを形成し、
該凹凸パターンの凹部分の底部に存在する前記薄膜を除去し、
その除去により露出した、前記凹部分の底部に存在する前記炭素薄膜を除去し、
炭素薄膜の除去により露出した、前記凹部分の底部に存在する前記磁性膜の少なくとも一部を除去する工程を有することを特徴とする凹凸パターン化された磁気記録媒体の製造方法。 - 前記炭素薄膜の除去を酸素ガスによるエッチングにより行い、かつ
前記磁性膜の除去をイオンミリングにより行うことを特徴とする請求項9に記載の凹凸パターン化された磁気記録媒体の製造方法。 - 前記炭素薄膜の厚さが10~30nmであることを特徴とする請求項9または10に記載の凹凸パターン化された磁気記録媒体の製造方法。
- 請求項9~11のいずれかに記載の凹凸パターン化された磁気記録媒体の製造方法で得られる磁気記録媒体。
- 請求項12に記載の磁気記録媒体を備えたことを特徴とする磁気記録再生装置。
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