Fujitsu Corporation

Showa Denko K.k.

Japan Atomic Energy Agency

The School Corporation Kansai University

A School Corporation Kansai University

Eishin Yamakawa

Keiji Watanabe

Hiroshi Chiba

Norikazu Nakamura

Kazuaki Kurihara

Masayuki Takeda

Tsukasa Itani

Hiroshi Tani

Shoichi Suda

Yukiko Oshikubo

Kazuki Shindo

Takeshi Toukairin

Hiroshi Sakai

Jun Watanabe

Yoshiharu Kasamatsu

Akira Kikuchi

Makoto Watanabe

Kota Hasegawa

Ichiro Kobayashi

Katsuaki To

Takayuki Musashi

Katsumi Kiuchi

Yoshito Kitamoto

Masahiro Takagi

Takahiro Ukai

Satoru Nakamura

Yoshihiro Mitobe

Jun Fujii

Shiro Entani

Takeshi Tokairin

Seiji Sakai

Yoshihiko Maruyama

Takuya Tomoi

Selvaraj Aanandha

Yuan Ai Khoo

Hiroyoshi Okumura

Hiromitsu Tanuma

Saeko Hayase

Makoto Okada

Takako Yamauchi

A method of manufacturing a magnetic recording medium forms an unfinished product including a magnetic recording layer and a protection layer that are successively formed on a substrate, and forms a lubricant layer on the protection layer of the unfinished product. The lubricant layer is formed by coating a first organic fluorine compound on the protection layer of the unfinished product, and supplying a gas, including a second organic fluorine compound, onto the protection layer of the unfinished product, and decomposing the second organic fluorine compound by Townsend discharge and ultraviolet ray irradiation. The protection layer includes carbon, and the first organic fluorine compound includes a functional group at a terminal thereof.

Method of manufacturing magnetic recording medium

A film production method for producing a thin film on a surface of a workpiece, including the steps of: disposing the workpiece in a chamber; supplying a process gas into the chamber with the inside of the chamber being maintained at a predetermined pressure; applying a light having an energy between 3 eV and 10 eV to the surface of the workpiece to cause a photoelectron to be emitted from the surface of the workpiece; and applying an AC electric field to the surface of the workpiece, wherein the AC electric field has an electric field intensity causing a Townsend discharge to occur without generating a glow discharge plasma.

Method for producing a thin film, method for producing a magnetic disk, method for producing a nanoimprint mold, and apparatus for producing a thin film

A magnetic recording medium which is capable of effectively preventing a surface thereof from being contaminated, and is capable of preventing a contaminant thereon from adhering (being transferred) to a magnetic head, and a magnetic recording and reproducing apparatus including the magnetic recording medium are provided, A carbon protective layer of the magnetic recording medium is nitrided, and as a lubricant a compound A expressed by the following General Formula (1) and a compound B expressed by the following General Formula (2) are mixed and used.R&#x2014;CHOCHCH(OH)CHOCH&#x2014;R&#x2014;CHOCHCH(OH)CHOH&#x2003;&#x2003;(1)CH(OH)CH(OH)CHOCHCFCF(OCFCFCF)OCFCFCHOCHCH(OH)CHOH&#x2003;&#x2003;(2)

Magnetic recording medium, and magnetic recording and reproducing apparatus

In a magnetic recording medium of the present invention, an outermost surface of a protective layeron a lubricant layerside contains carbon and nitrogen in a range of 50 atomic % to 90 atomic %, and the lubricant layeris formed by being in contact with the outermost surface, contains compounds A to C represented in the below general formulas (1) to (3) described below, and has a film thickness of 0.5 nm to 2 nm.R1-CHOCHCH(OH)CHOCH&#x2014;R2-CHOCHCH(OH)CHOH &#x2003;&#x2003;(1),CH(OH)CH(OH)CHOCHCFCF(OCFCFCF)OCFCFCHOCHCH(OH)CHOH &#x2003;&#x2003;(2),HOCHCFCFO(CFCFCFO)sCFCFCHOCHCH(OH)CHOH &#x2003;&#x2003;()

Magnetic recording medium and magnetic recording and reproducing apparatus

A perpendicular magnetic recording medium includes a perpendicular magnetic layer provided above a nonmagnetic substrate, and a protection layer provided on the perpendicular magnetic layer. The perpendicular magnetic layer has an hcp structure, and includes stacked layers having a (0002) crystal plane oriented parallel to a surface of the nonmagnetic substrate. An uppermost layer amongst the stacked layers includes polycrystal grains selected from a CoCr-base alloy, a CoPt-base alloy, a CoCrPt-base alloy, and a CoPtCr-base alloy. The protection layer makes contact with the uppermost layer of the perpendicular magnetic layer, and includes a single graphene layer or a graphene stack, and an amorphous carbon layer. The single graphene layer or the graphene stack is bonded in parallel to a (0002) crystal plane of the polycrystal grains.

Perpendicular magnetic recording medium and magnetic storage apparatus

According to an aspect of an embodiment, a method for manufacturing a storage medium includes providing a medium plate member for forming the storage medium and a guide member; and aligning the medium plate member and the guide member so that the medium plate member and the guide member are placed adjacently and the surfaces of the medium plate member and the guide member form a substantially common plane. The method further includes guiding a burnishing member for burnishing the medium plate member onto the surface of the guide member; and sliding the burnishing member on the guide member onto the medium plate member so as to burnish the surface of the medium plate member.

Method for manufacturing storage medium

A manufacturing method of a magnetic recording medium having a surface where a lubricating layer is provided, the manufacturing method includes the steps of: applying a lubricant so that the lubricating layer is formed; and inspecting the magnetic recording medium where the lubricating layer is formed; wherein the step of inspecting includes a first step of floating a magnetic head over the magnetic recording medium or sliding the magnetic head on a surface of the magnetic recording medium; a second step of adhering a medium facing surface of the magnetic head to a surface of a substrate for measuring, standing the medium facing surface of the magnetic head on the surface of the substrate for measuring, and transferring the lubricant from the medium facing surface of the magnetic head to the substrate for measuring; a third step of measuring an amount of the lubricant on the surface of the substrate for measuring; and a fourth step of determining whether the amount of the lubricant is proper.

Manufacturing method and evaluating method of magnetic recording medium

There are provided a composition that exhibits sufficient flowability and also displays high substrate adhesion, and a magnetic recording medium, a head slider and a magnetic recording device that use this composition as a lubricant and are thus not prone to faults. The composition comprises a fluorine-containing polyether represented by formula (1), (in formula (1), p and q represent, independently of the symbols in other formulae, any chosen integers). The composition can be produced by reacting a polymer represented by formula (2) with glycidol,HOCHCFO(CFCFO)(CFO)CFCHOH&#x2003;&#x2003;(2)(in formula (2), p and q represent, independently of the symbols in other formulae, any chosen integers).

Composition, magnetic recording medium, head slider, and magnetic recording device

A magnetic disk is produced with improved yield by forming a DLC protective film by a d.c. magnetron sputtering process conducted in a sputtering atmosphere containing oxygen. The magnetic disk carries a lubricating film on the DLC film wherein a fluorocarbon resin constituting the lubricating film contains photocrosslinking groups. A lubricating film having non-polar end groups is also disclosed.

Magnetic disk drive having a surface coating on a magnetic disk

A head slider to which little amount of contaminants is adhered, that can form a uniform and flat head lubricant layer surface and that has excellent ultra-low floating properties, as well as a magnetic recording device equipped with the head slider are provided. The head slider is equipped with a head slider lubricant layer having an average film thickness of not more than 2.5 nm, and composed of a water-repellent resin, the lubricant layer being formed on the head slider surface and head slider protection layer surface facing the magnetic recording medium, and the surface tension of the head slider lubricant layer determined by the Fowkes equation is not more than those of the head slider surface and head slider protection layer surface.

Magnetic recording device having a head slider utilizing a water-repellant resin lubricant having specified surface tension properties

In preparing a purified fluorine-based solvent from a fluorine-based solution comprising a lubricant based on a fluororesin having an organic terminal group and a fluorocarbon-based solvent, impurities including ionic pollutants contained in the fluorine-based solution or the lubricant are selectively removed by an adsorption process. The preparation apparatus of a purified fluorine-based solvent is also disclosed.

Method and apparatus for preparing fluorine-based solvent

In a magnetic recording medium wherein a magnetic recording layer for storing information, a carbon type protective layer for preventing damage of the magnetic recording layer and a lubrication layer are sequentially formed on a non-magnetic substrate, the carbon protective layer has a relatively smaller hydrogen content on the side nearer the lubrication layer than on the side nearer the magnetic recording layer. In a magnetic head slider having an electromagnetic conversion device mounted thereto, a carbon protective layer is laminated on at least a sliding surface side, and a lubrication layer is disposed on the carbon type protective layer. In a recording apparatus including a recording medium for storing information and a magnetic head for recording or reproducing information to and from the memory medium, a carbon protective film having a lower hydrogen content at an upper, surface portion thereof than at a lower, initial portion thereof is formed on either the recording medium or a sliding portion of the magnetic head.

Magnetic recording medium and magnetic head having carbon protective

In the method of the present invention, lubricant layers of magnetic discs, which have fixed thickness, can be formed by volatilizing solvent. The method of forming the lubricant layer on the magnetic disc, comprises the steps of: dipping the magnetic disc into a solution in which the lubricant is diluted with the volatile solvent; taking out the magnetic disc from the solution; and volatilizing the volatile solvent from a surface of the magnetic disc, wherein a layer of specific liquid, whose specific gravity is less than that of the solution and which is less volatile and insoluble in the solution, is formed on a surface of the solution.

Method of forming lubricant layer on magnetic disc, device for forming

Growing community of inventors

Higashine, Japan

Eishin Yamakawa