EP0187169A2
Expired / Lapsed
EP
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Process of manufacturing magnetic recording media and the media
Assignee: Proterial Ltd
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Filing: 1984-12-27
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Granted: —
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Expires: 2004-12-27
Abstract
Abstract A process of manufacturing Co-Ni magnetic recording media by sputtering Co-Ni thin film layer on a substrate in Argon atmosphere including nitrogen and heating the thin film to evaporate nitrogen from the thin film to prepare the magnetic recording media appropriate for high density longitudinal recording, wherein on sputtering the substrate is maintained at a temperature of room temperature to 300°C.
Inventors
- 👤 Juro Endo
- 👤 Shiro Murakami
- 👤 Shigeo Fujii
- 👤 Masayuki Nakao
- 👤 Tsutomu Iimura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 09:28
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/64; G11B5/65; G11B5/657; G11B5/84; G11B5/851
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
128 words
A process for manufacturing magnetic recording media comprising the steps of: sputtering with an alloy target on a non-magnetic substrate in atmosphere of inert gas including nitrogen, the non-magnetic substrate being maintained at a temperature of room temperature to 300°C and the alloy target having approximately the same composition as the composition of the final products, to obtain on the substrate a thin film including nitrogen, and heating the thin film to evaporate the nitrogen which has been absorbed in the thin film in the sputtering process and to form magnetic recording media which have a composition of Ni less than 35 atomic % and the balance sub- strantially being Co and substantially a hexagonal close packed crystalline structure which C-axes are mainly in a recording media plane.
Claim 2
Dependent Claim
128 words
A process for manufacturing magnetic recording media comprising the steps of: sputtering with an alloy target on a non-magnetic substrate in atmosphere of inert gas including nitrogen, the non-magnetic substrate being maintained at a temperature of room temperature to 300°C and the alloy target having approximately the same composition as the composition of the final products, to obtain on the substrate a thin film including nitrogen, and heating the thin film to evaporate the nitrogen which has been absorbed in the thin film in the sputtering process and to form magnetic recording media which have a composition of Ni less than 35 atomic % and the balance sub- strantially being Co and substantially a hexagonal close packed crystalline structure which C-axes are mainly in a recording media plane.
Claim 3
Dependent Claim
20 words
The process as set forth in Claim 1, wherein the thin film is formed on an anodized aluminum alloy substrate.
Claim 4
Dependent Claim
18 words
The process as set forth in Claim 2, wherein the thin film is 400 to 1,000 A thick.
Claim 5
Dependent Claim
22 words
The process as set forth in Claim 1, wherein the non-magnetic substrate is maintained at a temperature of room temperature to 100°C.
Claim 6
Dependent Claim
115 words
A magnetic recording media of a thin film formed on a non-magnetic substrate, the thin film having a composition of Ni less than 35 atomic % and the balance substantially being Co and substantially a hexagonal close packed crystalline structure which C-axes are mainly in a recording media plane, the thin film being sputtered in atmosphere of inert gas including nitrogen on the non-magnetic substrate which is maintained at a temperature of room temperature to 300°C and treated by heating the sputtered film to evaporate the nitrogen which has been absorbed in the sputtered film in the sputtering process and to increase the crystal size adequately from microcrystal or mixture of microcrystal and amorphous material.
Claim 7
Dependent Claim
115 words
A magnetic recording media of a thin film formed on a non-magnetic substrate, the thin film having a composition of Ni less than 35 atomic % and the balance substantially being Co and substantially a hexagonal close packed crystalline structure which C-axes are mainly in a recording media plane, the thin film being sputtered in atmosphere of inert gas including nitrogen on the non-magnetic substrate which is maintained at a temperature of room temperature to 300°C and treated by heating the sputtered film to evaporate the nitrogen which has been absorbed in the sputtered film in the sputtering process and to increase the crystal size adequately from microcrystal or mixture of microcrystal and amorphous material.
Claim 8
Dependent Claim
22 words
The magnetic recording media as set forth in Claim 5, wherein the thin film includes nitrogen of at most 5 atomic %.
References Cited (Backward Citations)
No citation records indexed.
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