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JP2010092564A - Method for manufacturing magnetic disk - Google Patents

Method for manufacturing magnetic disk Download PDF

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JP2010092564A
JP2010092564A JP2008263971A JP2008263971A JP2010092564A JP 2010092564 A JP2010092564 A JP 2010092564A JP 2008263971 A JP2008263971 A JP 2008263971A JP 2008263971 A JP2008263971 A JP 2008263971A JP 2010092564 A JP2010092564 A JP 2010092564A
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layer
carbon
protective layer
magnetic
based protective
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JP5117350B2 (en
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Keiichi Kajita
圭一 梶田
Shuhei Azuma
修平 東
Yusuke Watanabe
雄介 渡辺
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Hoya Corp
Hoya Magnetics Singapore Pte Ltd
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Hoya Magnetics Singapore Pte Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a magnetic disk with which a magnetic disk equipped with a thin film carbon-based protective layer having enhanced adhesiveness between itself and a lubricating layer and sufficient mechanical hardness is obtained. <P>SOLUTION: In the method for manufacturing the magnetic disk: an adhesion layer 2, a soft magnetic backing layer 3, an underlayer 4, a nonmagnetic intermediate layer 5, a magnetic recording layer 6, a carbon-based protective layer 7, and a lubricating layer 8 are sequentially formed on a substrate 1, wherein nitriding treatment is conducted to the carbon-based protective layer 7 by using a mixed gas of gaseous nitrogen and a rare gas having ionization energy larger than that of the gaseous nitrogen after deposition of the carbon-based protective layer 7. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、垂直磁気記録方式のハードディスクドライブ(HDD)などに搭載される磁気ディスクの製造方法に関する。   The present invention relates to a method of manufacturing a magnetic disk mounted on a perpendicular magnetic recording type hard disk drive (HDD) or the like.

磁気記録方式のHDDなどに搭載される磁気ディスクは、主に基板と金属層との密着性を向上させる密着層、磁気ヘッドが発生する磁束を磁気記録層へ集中させるための軟磁性材料の軟磁性裏打ち層、磁気記録層を目的の方向に配向させるための下地層、硬質磁性材料の磁気記録層、磁気記録層の表面を保護する保護層、磁気ヘッドの浮上を安定させるための潤滑層を順次形成してなる(例えば、特許文献1参照)。   A magnetic disk mounted on a magnetic recording type HDD or the like is mainly composed of an adhesion layer for improving the adhesion between a substrate and a metal layer, and a soft magnetic material for concentrating the magnetic flux generated by the magnetic head on the magnetic recording layer. Magnetic backing layer, underlayer for orienting the magnetic recording layer in the desired direction, magnetic recording layer of hard magnetic material, protective layer for protecting the surface of the magnetic recording layer, and lubricating layer for stabilizing the flying of the magnetic head They are formed sequentially (see, for example, Patent Document 1).

通常、保護層には炭素系保護層が用いられている。この炭素系保護層は主に炭化水素ガスを原料としたプラズマCVDによって成膜される。プラズマCVD法で成膜した炭素系保護層は、圧力、ガス流量、印加バイアスといったプロセスパラメータによって容易に膜質を変化させることができ、硬質かつコロージョン耐性や金属イオン耐溶出性に優れた保護層である。
特開2000−282238号公報
Usually, a carbon-based protective layer is used as the protective layer. This carbon-based protective layer is formed mainly by plasma CVD using hydrocarbon gas as a raw material. The carbon-based protective layer formed by plasma CVD can easily change the film quality depending on the process parameters such as pressure, gas flow rate, and applied bias, and is a hard protective layer with excellent corrosion resistance and metal ion elution resistance. is there.
JP 2000-282238 A

炭素系保護層は、主に炭素と水素からなる材料であることから濡れ性が悪く、その上に形成される潤滑層との結合が十分に行われない。このため、炭素系保護層を成膜した基板を窒素プラズマ雰囲気下でバイアス印加して炭素系保護層の表面に窒素を打ち込む窒化処理を行って、より濡れ性の高い窒化炭素にすることが行われる。   Since the carbon-based protective layer is a material mainly composed of carbon and hydrogen, the wettability is poor, and bonding with the lubricating layer formed thereon is not sufficiently performed. For this reason, the substrate on which the carbon-based protective layer is formed is biased in a nitrogen plasma atmosphere, and nitriding is performed in which nitrogen is implanted into the surface of the carbon-based protective layer to obtain carbon nitride having higher wettability. Is called.

窒化処理を行う目的は、潤滑層との間の密着力を向上させるためであるので、窒化処理は炭素系保護層の表層のみで十分である。しかしながら、上述の窒化方法では、炭素系保護層の表層のみではなく内部にも深く窒素が入り込んでしまう。通常、窒化処理を行った炭素系保護層は、窒化処理を行っていない炭素系保護層よりも柔らかく、機械的強度で劣る。すなわち、窒化処理を施すことで、炭素系保護層の機械的強度が低下する。そのため、保護膜としての機能を果たすために炭素系保護層の厚さを厚くする必要がある。炭素系保護層の厚さを厚くすることによって、垂直磁気記録媒体の磁気記録層と磁気ヘッドとの間の距離が遠くなり、このため、信号の読み書きが困難になり、高密度化できなくなるという問題がある。   Since the purpose of performing the nitriding treatment is to improve the adhesion between the lubricating layer and the nitriding treatment, only the surface layer of the carbon-based protective layer is sufficient. However, in the above nitriding method, nitrogen enters deeply not only into the surface layer of the carbon-based protective layer but also into the inside. Usually, the carbon-based protective layer subjected to nitriding treatment is softer and inferior in mechanical strength than the carbon-based protective layer not subjected to nitriding treatment. That is, by performing nitriding treatment, the mechanical strength of the carbon-based protective layer is lowered. For this reason, it is necessary to increase the thickness of the carbon-based protective layer in order to fulfill the function as a protective film. Increasing the thickness of the carbon-based protective layer increases the distance between the magnetic recording layer of the perpendicular magnetic recording medium and the magnetic head, which makes it difficult to read and write signals and cannot increase the density. There's a problem.

本発明はかかる点に鑑みてなされたものであり、潤滑層との間の密着性を高めると共に十分な機械的強度を持つ薄膜の炭素系保護層を備えた磁気ディスクを得ることができる磁気ディスクの製造方法を提供することを目的とする。   The present invention has been made in view of the above points, and can provide a magnetic disk provided with a thin carbon-based protective layer having a sufficient mechanical strength while improving the adhesion with the lubricating layer. It aims at providing the manufacturing method of.

本発明の磁気ディスクの製造方法は、ディスク基体上に少なくとも磁気記録層を形成する磁気記録層形成工程と、前記磁気記録層上に炭素系保護層を形成する保護層形成工程と、を具備する磁気ディスクの製造方法であって、前記保護層形成工程は、前記磁気記録層上に前記炭素系材料を成膜する工程と、前記成膜した炭素系材料膜に対して、窒素よりもイオン化エネルギーの大きい希ガスを含む窒素ガスで窒化処理する工程と、を含むことを特徴とする。   The method for producing a magnetic disk of the present invention comprises a magnetic recording layer forming step of forming at least a magnetic recording layer on a disk substrate, and a protective layer forming step of forming a carbon-based protective layer on the magnetic recording layer. In the method of manufacturing a magnetic disk, the protective layer forming step includes a step of forming the carbon-based material on the magnetic recording layer, and ionizing energy rather than nitrogen with respect to the formed carbon-based material film. And nitriding with a nitrogen gas containing a large noble gas.

この方法によれば、炭素系保護層の窒化処理において、この種の希ガスを加えることにより、窒化処理チャンバ内の圧力が高まり、窒素イオンが基板に到達するまでに希ガスと衝突して運動エネルギーが減少し、窒素イオンの基板への衝突エネルギーが小さくなり、炭素系保護層の表層のみが窒化処理される。これにより、窒化処理において、窒素が炭素系保護層の内部深くに入り込むことを阻止することができる。炭素系保護層は、表層以外の領域で機械的強度を維持するので、機械的強度低下が最小限に抑えられ、薄型化が可能となる。   According to this method, in the nitriding treatment of the carbon-based protective layer, by adding this kind of rare gas, the pressure in the nitriding treatment chamber increases, and the nitrogen ions collide with the rare gas and move before reaching the substrate. The energy is reduced, the collision energy of nitrogen ions to the substrate is reduced, and only the surface layer of the carbon-based protective layer is nitrided. Thereby, it is possible to prevent nitrogen from entering deep inside the carbon-based protective layer in the nitriding treatment. Since the carbon-based protective layer maintains the mechanical strength in a region other than the surface layer, a decrease in mechanical strength can be minimized and the thickness can be reduced.

本発明の磁気ディスクの製造方法においては、前記希ガスがヘリウムガス又はネオンガスであることが好ましい。   In the method for manufacturing a magnetic disk according to the present invention, the rare gas is preferably helium gas or neon gas.

本発明の磁気ディスクの製造方法においては、前記炭素系保護層は、プラズマCVD法により形成されたことが好ましい。   In the method for manufacturing a magnetic disk of the present invention, the carbon-based protective layer is preferably formed by a plasma CVD method.

本発明の磁気ディスクの製造方法は、ディスク基体上に少なくとも磁気記録層を形成する磁気記録層形成工程と、前記磁気記録層上に炭素系保護層を形成する保護層形成工程と、を具備し、前記保護層形成工程において、前記磁気記録層上に前記炭素系材料を成膜し、その後成膜した炭素系材料膜に対して、窒素よりもイオン化エネルギーの大きい希ガスを含む窒素ガスで窒化処理するので、潤滑層との間の密着性を高めると共に十分な機械的強度を持つ薄膜の炭素系保護層を設けることができる。   The magnetic disk manufacturing method of the present invention includes a magnetic recording layer forming step of forming at least a magnetic recording layer on a disk substrate, and a protective layer forming step of forming a carbon-based protective layer on the magnetic recording layer. In the protective layer forming step, the carbon-based material is formed on the magnetic recording layer, and then the formed carbon-based material film is nitrided with a nitrogen gas containing a rare gas having an ionization energy larger than that of nitrogen. Since the treatment is performed, it is possible to provide a thin carbon-based protective layer having sufficient mechanical strength while improving adhesion to the lubricating layer.

以下、本発明の実施の形態について、添付図面を参照して詳細に説明する。
本発明の磁気ディスクの製造方法においては、保護層形成工程で、前記磁気記録層上に前記炭素系材料を成膜し、その後成膜した炭素系材料膜に対して、窒素よりもイオン化エネルギーの大きい希ガスを含む窒素ガスで窒化処理する。
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
In the method for manufacturing a magnetic disk of the present invention, in the protective layer forming step, the carbon-based material is formed on the magnetic recording layer, and the ionization energy of the carbon-based material film formed after that is higher than that of nitrogen. Nitriding is performed with nitrogen gas containing a large noble gas.

窒素ガスのみ用いた従来の窒化処理では、窒素ガス雰囲気下で窒素プラズマを生成させ、バイアスを印加した基板に対して、プラズマ中のイオン化した窒素を衝突させることで、炭素系保護層に窒化を行う。炭素系保護層を窒化処理する目的は、上述したように、炭素系保護層に濡れ性の高い窒化炭素を形成し、その窒化炭素で潤滑剤との間の結合を促進させるためである。この目的では、窒化処理は炭素系保護層の表層のみで十分である。   In a conventional nitriding process using only nitrogen gas, nitrogen plasma is generated in a nitrogen gas atmosphere, and ionized nitrogen in the plasma is collided against a substrate to which a bias is applied, thereby nitriding the carbon-based protective layer. Do. The purpose of nitriding the carbon-based protective layer is to form carbon nitride with high wettability on the carbon-based protective layer and promote bonding between the carbon nitride and the lubricant. For this purpose, the surface of the carbon-based protective layer is sufficient for the nitriding treatment.

そこで、本発明においては、炭素系保護層の窒化処理に用いる処理ガスとして、窒素ガスに、窒素よりもイオン化エネルギーの大きい希ガスを加えた混合ガスを用いる。この種の希ガスを加えることで、窒化処理チャンバ内の圧力が高まり、窒素イオンが基板に到達するまでに希ガスと衝突して運動エネルギーが減少し、窒素イオンの基板への衝突エネルギーが小さくなり、炭素系保護層の表層のみが窒化処理されることとなる。これにより、窒化処理において、窒素が炭素系保護層の内部深くに入り込むことを阻止することができる。炭素系保護層は、表層以外の領域で機械的強度を維持するので、機械的強度低下が最小限に抑えられる。このように、炭素系保護層の機械的強度の低下を最小限に抑えることができるので、薄型化が可能となり、磁気ヘッドと磁気ディスクの磁気記録層との間の距離を短くできる。これにより出力−ノイズ比が向上し、磁気ディスクの高密度化が可能となる。   Therefore, in the present invention, a mixed gas obtained by adding a rare gas having a higher ionization energy than nitrogen to nitrogen gas is used as a processing gas used for nitriding treatment of the carbon-based protective layer. By adding this kind of rare gas, the pressure in the nitriding chamber increases, and the nitrogen ions collide with the rare gas before reaching the substrate to reduce the kinetic energy, and the collision energy of the nitrogen ions to the substrate is reduced. Thus, only the surface layer of the carbon-based protective layer is nitrided. Thereby, it is possible to prevent nitrogen from entering deep inside the carbon-based protective layer in the nitriding treatment. Since the carbon-based protective layer maintains the mechanical strength in a region other than the surface layer, a decrease in mechanical strength is minimized. As described above, since the decrease in the mechanical strength of the carbon-based protective layer can be minimized, the thickness can be reduced, and the distance between the magnetic head and the magnetic recording layer of the magnetic disk can be shortened. As a result, the output-noise ratio is improved, and the density of the magnetic disk can be increased.

図1は、本発明の実施の形態に係る磁気ディスクの製造方法により得られた磁気ディスクの概略構成を示す図である。   FIG. 1 is a diagram showing a schematic configuration of a magnetic disk obtained by a magnetic disk manufacturing method according to an embodiment of the present invention.

図1において、本実施の形態に係る磁気ディスクは、ディスク基体である基板1と、密着層2と、軟磁性裏打ち層3と、下地層4と、非磁性中間層5と、磁気記録層6と、炭素系保護層7と、潤滑層8とを有する。   In FIG. 1, the magnetic disk according to the present embodiment includes a substrate 1, which is a disk substrate, an adhesion layer 2, a soft magnetic backing layer 3, an underlayer 4, a nonmagnetic intermediate layer 5, and a magnetic recording layer 6. And a carbon-based protective layer 7 and a lubricating layer 8.

基板(磁気ディスク用基板)1としては、例えば、ガラス基板、アルミニウム基板、シリコン基板、プラスチック基板などを用いることができる。基板1として、表面が平滑な化学強化ガラス基板を用いる場合には、例えば、素材加工工程及び第1ラッピング工程;端部形状工程(穴部を形成するコアリング工程、端部(外周端部及び/又は内周端部)に面取り面を形成するチャンファリング工程(面取り面形成工程));端面研磨工程(外周端部及び内周端部);第2ラッピング工程;主表面研磨工程(第1及び第2研磨工程);化学強化工程などの工程を含む製造工程により製造することができる。   As the substrate (magnetic disk substrate) 1, for example, a glass substrate, an aluminum substrate, a silicon substrate, a plastic substrate, or the like can be used. When a chemically strengthened glass substrate having a smooth surface is used as the substrate 1, for example, a material processing step and a first lapping step; an end portion shape step (a coring step for forming a hole, an end portion (an outer peripheral end portion and Chamfering step for forming a chamfered surface (or chamfered surface forming step)); end surface polishing step (outer peripheral end and inner peripheral end); second lapping step; main surface polishing step (first And 2nd grinding | polishing process); It can manufacture by the manufacturing process including processes, such as a chemical strengthening process.

密着層2は、基板1と軟磁性裏打ち層3との間の密着性を向上させるものであり、軟磁性裏打ち層3の剥離を防止することができる。密着層2の材料としては、例えばCrTi合金を用いることができる。   The adhesion layer 2 improves adhesion between the substrate 1 and the soft magnetic backing layer 3, and can prevent the soft magnetic backing layer 3 from peeling off. As a material of the adhesion layer 2, for example, a CrTi alloy can be used.

軟磁性裏打ち層3は、例えば、第1軟磁性層と第2軟磁性層の間に非磁性のスペーサ層を介在させることによって、AFC(Antiferro magnetic exchange coupling:反強磁性交換結合)を備えるように構成することができる。これにより、軟磁性裏打ち層3の磁化方向を高い精度で磁路(磁気回路)に沿って整列させることができ、磁化方向の垂直成分が極めて少なくなるため、軟磁性裏打ち層3から生じるノイズを低減することができる。具体的には、第1軟磁性層、第2軟磁性層の組成は、CoFeTaZrとし、スペーサ層の組成はRu(ルテニウム)とすることができる。   The soft magnetic backing layer 3 includes, for example, an AFC (Antiferromagnetic exchange coupling) by interposing a nonmagnetic spacer layer between the first soft magnetic layer and the second soft magnetic layer. Can be configured. Thereby, the magnetization direction of the soft magnetic backing layer 3 can be aligned with high accuracy along the magnetic path (magnetic circuit), and the perpendicular component of the magnetization direction is extremely reduced. Can be reduced. Specifically, the composition of the first soft magnetic layer and the second soft magnetic layer can be CoFeTaZr, and the composition of the spacer layer can be Ru (ruthenium).

下地層4は、この上に形成する非磁性中間層4の結晶性、配向性などを向上するために設けることが好ましい層で、省略することも可能である。下地層4の材料としては、fcc構造を有する軟磁性材料を用いることが好ましい。例えば、Ni、NiTa、NiWから選択することができる。   The underlayer 4 is a layer that is preferably provided in order to improve the crystallinity and orientation of the nonmagnetic intermediate layer 4 formed thereon, and can be omitted. As the material for the underlayer 4, it is preferable to use a soft magnetic material having an fcc structure. For example, it can be selected from Ni, NiTa, and NiW.

非磁性中間層5は、hcp構造であって、磁気記録層6のhcp構造の結晶をグラニュラー構造として成長させることができる。したがって、非磁性中間層5の結晶配向性が高いほど、磁気記録層6の配向性を向上させることができる。非磁性中間層5の材質としては、Ruの他に、RuCr、RuCoから選択することができる。Ruはhcp構造をとり、Coを主成分とする磁気記録層6を良好に配向させることができる。   The nonmagnetic intermediate layer 5 has an hcp structure, and the crystal of the hcp structure of the magnetic recording layer 6 can be grown as a granular structure. Therefore, the higher the crystal orientation of the nonmagnetic intermediate layer 5 is, the more the orientation of the magnetic recording layer 6 can be improved. The material of the nonmagnetic intermediate layer 5 can be selected from RuCr and RuCo in addition to Ru. Ru has an hcp structure and can satisfactorily orient the magnetic recording layer 6 containing Co as a main component.

磁気記録層6は、複合酸化物(複数の種類の酸化物)で構成されている。例えば、SiOとTiOをそれぞれ3mol%ずつ含有し、CoCrPt−3SiO−3TiOのhcp結晶構造の複合酸化物やSiOとTiOをそれぞれ5mol%ずつ含有し、CoCrPt−5SiO−5TiOのhcp結晶構造の複合酸化物などが挙げられる。これらの複合酸化物においては、複合酸化物は磁性物質であるCoの周囲に偏析して粒界を形成し、磁性粒(磁性グレイン)は柱状のグラニュラー構造を形成する。この磁気記録層6は、単層であっても良く、複数層で構成されても良い。 The magnetic recording layer 6 is composed of a complex oxide (a plurality of types of oxides). For example, it contains 3 mol% each of SiO 2 and TiO 2 , a composite oxide having a hcp crystal structure of CoCrPt-3SiO 2 -3TiO 2 , 5 mol% each of SiO 2 and TiO 2 , and CoCrPt-5SiO 2 -5 TiO 2 . 2 composite oxides having an hcp crystal structure. In these composite oxides, the composite oxide segregates around Co, which is a magnetic substance, to form grain boundaries, and the magnetic grains (magnetic grains) form a columnar granular structure. The magnetic recording layer 6 may be a single layer or a plurality of layers.

必要に応じて、磁気記録層6と非磁性中間層5との間にグラニュラー構造の微細化促進層を設けて、上記磁性粒を、微細化促進層のグラニュラー構造から継続してエピタキシャル成長させても良い。また、必要に応じて、磁気記録層6上に、磁気記録層6の高密度記録性と低ノイズ性に加えて、逆磁区核形成磁界Hnの向上、耐熱揺らぎ特性の改善、オーバーライト特性の改善ために、面内方向に磁気的に連続した層である補助記録層を設けても良い。   If necessary, a granular structure miniaturization promoting layer may be provided between the magnetic recording layer 6 and the nonmagnetic intermediate layer 5, and the magnetic grains may be epitaxially grown continuously from the granular structure of the miniaturization promoting layer. good. If necessary, on the magnetic recording layer 6, in addition to the high density recording property and low noise property of the magnetic recording layer 6, the reverse domain nucleation magnetic field Hn is improved, the heat-resistant fluctuation property is improved, and the overwrite property is improved. For improvement, an auxiliary recording layer which is a magnetically continuous layer in the in-plane direction may be provided.

炭素系保護層7は、磁気ヘッドの衝撃から磁気記録層6を防護するための保護膜である。一般にCVD法によって成膜されたカーボンはスパッタリング法によって成膜したものと比べて膜硬度が向上するので、磁気ヘッドからの衝撃に対してより有効に磁気記録層5を保護することができる。   The carbon-based protective layer 7 is a protective film for protecting the magnetic recording layer 6 from the impact of the magnetic head. In general, carbon deposited by the CVD method has improved film hardness as compared with that deposited by the sputtering method, so that the magnetic recording layer 5 can be more effectively protected against an impact from the magnetic head.

炭素系保護層7は、真空を保ったままカーボンをCVD法により成膜して形成した後に、窒素ガスと、窒素よりもイオン化エネルギーの大きい希ガスとの混合ガスを用いて窒化処理を行うことにより形成する。これにより、濡れ性を高くでき、潤滑層8との間の密着性を向上させることができる。これにより、磁気ディスクとして製品化してHDDに搭載した場合、外部衝撃や飛行の乱れによって磁気ヘッドがディスク表面に接触してもディスク表面からスライダ表面へ潤滑剤の移着が起こり難くなり、磁気ヘッドの安定浮上を妨害する虞のない信頼性の高い磁気ディスクを実現できる。また、炭素系保護層7は表層だけが窒化されており、その他の領域がカーボンで構成されるので、磁気記録層6を保護するために十分な機械的強度をもつ。このため、炭素系保護槽の薄型化が可能となり、磁気ヘッドと磁気ディスクの磁気記録層との間の距離を短くでき、これにより出力−ノイズ比が向上して磁気ディスクの高密度化が可能となる。   The carbon-based protective layer 7 is formed by forming a carbon film by a CVD method while maintaining a vacuum, and then performing a nitriding treatment using a mixed gas of nitrogen gas and a rare gas having a higher ionization energy than nitrogen. To form. Thereby, wettability can be made high and adhesiveness between the lubricating layers 8 can be improved. As a result, when the magnetic disk is commercialized and mounted on the HDD, even if the magnetic head comes into contact with the disk surface due to external impact or flight disturbance, it is difficult for the lubricant to transfer from the disk surface to the slider surface. It is possible to realize a highly reliable magnetic disk that does not interfere with stable flying of the disk. Further, since the carbon-based protective layer 7 is nitrided only on the surface layer and other regions are made of carbon, the carbon-based protective layer 7 has sufficient mechanical strength to protect the magnetic recording layer 6. This makes it possible to reduce the thickness of the carbon-based protection tank, shorten the distance between the magnetic head and the magnetic recording layer of the magnetic disk, thereby improving the output-noise ratio and increasing the density of the magnetic disk. It becomes.

炭素系保護層7の窒化処理における混合ガスの希ガスの混合量は、50%以下であることが好ましい。この範囲であれば、表層のみが濡れ性を持つ窒化炭素であり、かつ、十分な機械的強度を有する炭素系保護層7を得ることができる。このような希ガスとしては、ヘリウムガスやネオンガスが挙げられる。また、窒化処理の時間は、表層のみが窒化されることを考慮して、1秒〜3秒であることが好ましい。   The amount of mixed rare gas in the nitriding treatment of the carbon-based protective layer 7 is preferably 50% or less. Within this range, it is possible to obtain a carbon-based protective layer 7 in which only the surface layer is carbon nitride having wettability and has sufficient mechanical strength. Examples of such rare gas include helium gas and neon gas. The time for the nitriding treatment is preferably 1 to 3 seconds considering that only the surface layer is nitrided.

潤滑層8は、PFPE(パーフロロポリエーテル)を浸漬法により成膜するこのとき、浸漬法により成膜した後に、ベークを行って潤滑剤を硬化させて潤滑層を形成する。   The lubricating layer 8 is formed by immersing PFPE (perfluoropolyether) by the dipping method. After forming the film by the dipping method, baking is performed to cure the lubricant to form the lubricating layer.

上記構成を有する磁気ディスクは、この基板1上に、真空引きを行ったDCマグネトロンスパッタ装置を用いて、アルゴン(Ar)雰囲気中で、密着層2から磁気記録層6まで順次成膜を行い、その後、炭素系保護層7をCVD法により成膜し、続いて、炭素系保護層7に対して希ガスと窒素ガスの混合ガスを用いた窒化処理を行い、その後、DCマグネトロンスパッタ装置から取り出し、洗浄した後、潤滑層8をディップコート法(浸漬塗布法)により形成する、ことにより得られる。   The magnetic disk having the above-described configuration is sequentially formed on the substrate 1 from the adhesion layer 2 to the magnetic recording layer 6 in an argon (Ar) atmosphere using a evacuated DC magnetron sputtering apparatus. Thereafter, the carbon-based protective layer 7 is formed by a CVD method. Subsequently, the carbon-based protective layer 7 is nitrided using a mixed gas of a rare gas and a nitrogen gas, and then taken out from the DC magnetron sputtering apparatus. After the cleaning, the lubricating layer 8 is obtained by dip coating (dip coating).

次に、本発明の効果を明確にするために行った実施例について説明する。
(実施例1)
非磁性の基板として表面が平滑な化学強化ガラス基板を用い、これを洗浄した後、DCマグネトロンスパッタ装置内に導入し、厚さ10nmの密着層2(Cr45Ti)、厚さ46nmの軟磁性裏打ち層3(C92(60Co40Fe)−3Ta−5Zr)、厚さ9nmの下地層4(Ni5W)、厚さ21nmの非磁性中間層5(Ru)、厚さがそれぞれ2nm,9nm,7nmの磁気記録層6(それぞれ93(Co−20Cr−18Pt)−7Cr,87(Co−10Cr−18Pt)−5SiO−TiO−3CoO,95(Co−18Cr−13Pt)−5B、厚さ5nmの炭素系保護層7を成膜した。続いて、窒素にヘリウムを36%添加した混合ガスを用いて、炭素系保護層7に対して窒化処理を行った。このあと、DCマグネトロンスパッタ装置から取り出し、洗浄後ディップ法により潤滑剤(PFPE)を塗布し、ベークして潤滑層8形成した。このようにして実施例1の磁気ディスクを作製した。
Next, examples performed for clarifying the effects of the present invention will be described.
Example 1
A chemically strengthened glass substrate having a smooth surface is used as a non-magnetic substrate, which is cleaned and then introduced into a DC magnetron sputtering apparatus. A 10 nm thick adhesion layer 2 (Cr45Ti) and a 46 nm thick soft magnetic backing layer 3 (C92 (60Co40Fe) -3Ta-5Zr), an underlayer 4 (Ni5W) having a thickness of 9 nm, a nonmagnetic intermediate layer 5 (Ru) having a thickness of 21 nm, and a magnetic recording layer 6 having a thickness of 2 nm, 9 nm, and 7 nm, respectively. (respectively 93 (Co-20Cr-18Pt) -7Cr 2 O 3, 87 (Co-10Cr-18Pt) -5SiO 2 -TiO 2 -3CoO, 95 (Co-18Cr-13Pt) -5B, carbonaceous thickness of 5nm A protective layer 7 was formed, and then the carbon-based protective layer 7 was nitrided using a mixed gas obtained by adding 36% helium to nitrogen. Removed from the DC magnetron sputtering apparatus, a lubricant (PFPE) was applied by washing after dipping were lubricating layer 8 formed is baked. To prepare a magnetic disk of Example 1 in this manner.

(実施例2)
窒素ガスにネオンガスを36%添加した混合ガスを用いて窒化処理を行うこと以外実施例1と同様にして実施例2の磁気ディスクを作製した。
(Example 2)
A magnetic disk of Example 2 was fabricated in the same manner as in Example 1 except that nitriding was performed using a mixed gas obtained by adding 36% neon gas to nitrogen gas.

(比較例1)
窒素ガスにアルゴンガスを36%添加した混合ガスを用いて窒化処理を行うこと以外実施例1と同様にして比較例1の磁気ディスクを作製した。
(Comparative Example 1)
A magnetic disk of Comparative Example 1 was fabricated in the same manner as in Example 1 except that nitriding was performed using a mixed gas obtained by adding 36% of argon gas to nitrogen gas.

(比較例2)
窒素のみを用いて窒化処理を行うこと以外実施例1と同様にして比較例2の磁気ディスクを作製した。
(Comparative Example 2)
A magnetic disk of Comparative Example 2 was fabricated in the same manner as in Example 1 except that nitriding was performed using only nitrogen.

作製した実施例1,2及び比較例1,2の磁気ディスクについて、炭素系保護層7上の潤滑層8の結合率(B.R.:Bonded Ratio)及びピンオン試験による耐摩耗性を調べた。結合率は、FT−IR(フーリエ変換型赤外分光法)により求め、比較例2と同等である場合を○とした。また、ピンオン試験は、一定周速で回転させたディスク上に、一定加重で棒の先に固定させたボールを押し付けることで摺動させ、破断するまでの回転数を計測することにより行い、比較例2の炭素系保護層7を0.5nm厚くしたものと比較して、同等以上である場合を○とし、劣っている場合を×とした。すなわち、○である場合は、炭素系保護層7を0.5nm薄くしても比較例2と同等のピンオン耐性を持つことを示す。これらの結果を下記表1に示す。

Figure 2010092564
About the produced magnetic disks of Examples 1 and 2 and Comparative Examples 1 and 2, the wear rate by the bond ratio (BR: Bonded Ratio) of the lubricating layer 8 on the carbon-based protective layer 7 and the pin-on test was examined. . The binding rate was determined by FT-IR (Fourier transform infrared spectroscopy), and the case where it was equivalent to Comparative Example 2 was marked as ◯. In addition, the pin-on test is carried out by measuring the number of rotations until the ball breaks by pressing a ball fixed at the tip of the rod with a constant load onto a disk rotated at a constant peripheral speed. Compared with the case where the carbon-based protective layer 7 of Example 2 was thickened by 0.5 nm, the case where the carbon-based protective layer 7 was equal to or greater than that was evaluated as ○, and the case where it was inferior was evaluated as ×. That is, when it is (circle), even if it makes the carbon-type protective layer 7 0.5 nm thin, it shows having pin-on tolerance equivalent to the comparative example 2. These results are shown in Table 1 below.
Figure 2010092564

表1から分かるように、実施例1,2の磁気ディスクでは、相対的に厚さが薄い炭素系保護層であっても十分な耐摩耗性が得られており、潤滑層との間の密着力が十分であった。これに対して、比較例1,2の磁気ディスクでは、潤滑層との間の密着力が十分でなく、十分な耐摩耗性が得られなかった。   As can be seen from Table 1, in the magnetic disks of Examples 1 and 2, sufficient wear resistance was obtained even with a relatively thin carbon-based protective layer, and adhesion with the lubricating layer Power was enough. On the other hand, in the magnetic disks of Comparative Examples 1 and 2, the adhesion with the lubricating layer was not sufficient, and sufficient wear resistance was not obtained.

また、実施例1,2及び比較例1,2の方法で炭素系保護層7までを形成した磁気ディスクについて、炭素系保護層7の機械的強度を調べたところ、すべて十分な機械的強度が得られたことが確認された。なお、機械的強度は、ピンオン試験をすることにより行い、比較例2と同等以上のピンオン耐性である場合を「十分な機械的強度がある」とした。   Further, when the mechanical strength of the carbon-based protective layer 7 was examined for the magnetic disk on which the carbon-based protective layer 7 was formed by the methods of Examples 1 and 2 and Comparative Examples 1 and 2, all the mechanical strength was sufficient. It was confirmed that it was obtained. The mechanical strength was determined by performing a pin-on test, and the case where the pin-on resistance was equal to or higher than that of Comparative Example 2 was defined as “sufficient mechanical strength”.

本発明は上記実施の形態に限定されず、適宜変更して実施することができる。上記実施の形態における材質、個数、サイズ、処理手順などは一例であり、本発明の効果を発揮する範囲内において種々変更して実施することが可能である。その他、本発明の目的の範囲を逸脱しない限りにおいて適宜変更して実施することが可能である。   The present invention is not limited to the above embodiment, and can be implemented with appropriate modifications. The material, the number, the size, the processing procedure, and the like in the above embodiment are merely examples, and various modifications can be made within the range where the effects of the present invention are exhibited. In addition, various modifications can be made without departing from the scope of the object of the present invention.

本発明は、垂直磁気記録方式のHDDなどに搭載される磁気ディスクに適用することができる。   The present invention can be applied to a magnetic disk mounted on a perpendicular magnetic recording type HDD or the like.

本発明の実施の形態に係る磁気ディスクの製造方法により得られた磁気ディスクの概略構成を示す図である。It is a figure which shows schematic structure of the magnetic disc obtained by the manufacturing method of the magnetic disc which concerns on embodiment of this invention.

符号の説明Explanation of symbols

1 基板
2 密着層
3 軟磁性裏打ち層
4 下地層
5 非磁性中間層
6 磁気記録層
7 炭素系保護層
8 潤滑層
DESCRIPTION OF SYMBOLS 1 Substrate 2 Adhesion layer 3 Soft magnetic backing layer 4 Underlayer 5 Nonmagnetic intermediate layer 6 Magnetic recording layer 7 Carbon-based protective layer 8 Lubrication layer

Claims (3)

ディスク基体上に少なくとも磁気記録層を形成する磁気記録層形成工程と、前記磁気記録層上に炭素系保護層を形成する保護層形成工程と、を具備する磁気ディスクの製造方法であって、前記保護層形成工程は、前記磁気記録層上に前記炭素系材料を成膜する工程と、前記成膜した炭素系材料膜に対して、窒素よりもイオン化エネルギーの大きい希ガスを含む窒素ガスで窒化処理する工程と、を含むことを特徴とする磁気ディスクの製造方法。   A method for manufacturing a magnetic disk comprising: a magnetic recording layer forming step for forming at least a magnetic recording layer on a disk substrate; and a protective layer forming step for forming a carbon-based protective layer on the magnetic recording layer, The protective layer forming step includes forming the carbon-based material on the magnetic recording layer, and nitriding the formed carbon-based material film with nitrogen gas containing a rare gas having an ionization energy larger than nitrogen. And a process for processing the magnetic disk. 前記希ガスがヘリウムガス又はネオンガスであることを特徴とする請求項1記載の磁気ディスクの製造方法。   2. The method of manufacturing a magnetic disk according to claim 1, wherein the rare gas is helium gas or neon gas. 前記炭素系保護層は、プラズマCVD法により形成されたことを特徴とする請求項1又は請求項2記載の磁気ディスクの製造方法。   3. The method of manufacturing a magnetic disk according to claim 1, wherein the carbon-based protective layer is formed by a plasma CVD method.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5968819A (en) * 1982-10-12 1984-04-18 Tdk Corp Magnetic recording medium
JPH11316942A (en) * 1998-05-02 1999-11-16 Edokoro Sotaro Magnetic recording medium and its production
JP2001189007A (en) * 1999-07-16 2001-07-10 Fuji Photo Film Co Ltd Magnetic disk and method of magnetic recording by using floppy disk

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5968819A (en) * 1982-10-12 1984-04-18 Tdk Corp Magnetic recording medium
JPH11316942A (en) * 1998-05-02 1999-11-16 Edokoro Sotaro Magnetic recording medium and its production
JP2001189007A (en) * 1999-07-16 2001-07-10 Fuji Photo Film Co Ltd Magnetic disk and method of magnetic recording by using floppy disk

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