Magnetic recording media
First Claim
Patent Images
1. A magnetic recording medium, comprising:
- a base material made of non-magnetic material;
a recording layer disposed on said base material, said recording layer being made of a ferromagnetic material; and
a protective layer disposed on said recording layer;
said protective layer being constituted by a diamond-like film of carbon having a Vicker'"'"'s hardness of more than 2000 kg/mm2 and a specific resistance of 107 Ω
·
cm to 1013 Ω
·
cm; and
said ferromagnetic material comprising an element which forms a carbide with carbon of said protective layer, in which said element is bonded to said carbon by covalent bonding or forms an intermetallic compound therewith.
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Abstract
A magnetic recording medium has a protective layer made of high hardness carbon synthesized under a low-temperature and a low-pressure by blowing hydrocarbon gas plasma onto a magnetic recording layer. The resistance thereof is large, and therefore, high density magnetic recording can be realized in a magnetic recording system wherein the magnetic head contacts the magnetic recording medium. Durability of the magnetic recording medium is substantially improved.
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Citations
8 Claims
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1. A magnetic recording medium, comprising:
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a base material made of non-magnetic material; a recording layer disposed on said base material, said recording layer being made of a ferromagnetic material; and a protective layer disposed on said recording layer; said protective layer being constituted by a diamond-like film of carbon having a Vicker'"'"'s hardness of more than 2000 kg/mm2 and a specific resistance of 107 Ω
·
cm to 1013 Ω
·
cm; andsaid ferromagnetic material comprising an element which forms a carbide with carbon of said protective layer, in which said element is bonded to said carbon by covalent bonding or forms an intermetallic compound therewith. - View Dependent Claims (2, 3)
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4. A method for making a magnetic recording medium, comprising:
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(a) providing a base material made of non-magnetic material; (b) successively, and in the same chamber, (i) forming on said base material a recording layer made of ferromagnetic material by one of sputtering and vapor deposition, and (ii) forming on said recording layer a protective layer of amorphous diamond by blowing a hydrocarbon gas plasma onto said recording layer while accelerating towards said recording layer ions of at least one chemical and electronic constituency in said plasma. - View Dependent Claims (5, 6, 7, 8)
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Specification