Magnetic disk and method of producing the same
AssigneesHoya Corporation, Hoya Magnetics Singapore Pte. Ltd.
InventorMasafumi Ishiyama
Life of this patent
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Abstract
A magnetic disk includes a substrate on which a nonmagnetic metal layer, a magnetic layer, a carbon-based protection layer, an alcohol-based coupling layer, and a lubrication layer successively formed thereon. The lubrication layer contains a hydroxyl- or a carboxyl-modified compound as a lubricating material. The alcohol-based coupling layer contains, for example, lower alcohol as a main component and is deposited on the carbon-based protection layer, for example, by vapor deposition. The alcohol-based coupling layer may be replaced by a layer containing lower alcohol. The carbon-based protection layer may be deposited by plasma CVD.
Claims10
A method of producing a magnetic disk, comprising successively depositing a magnetic layer and a carbon-based protection layer on a disk substrate, thereafter depositing an alcohol-based coupling layer on the carbon-based protection layer, and then depositing a lubrication layer containing a hydroxyl- or a carboxyl-modified compound,
- whereby the carbon-based protection layer and the lubrication layer are bonded to each other by the alcohol-based coupling layer.
A method of producing a magnetic disk, comprising successively depositing a magnetic layer and a carbon-based protection layer on a disk substrate, thereafter depositing a layer containing lower alcohol on the carbon-based protection layer, and then depositing a lubrication layer containing a hydroxyl- or a carboxyl-modified compound.
Dependencies are inferred from the claim text.