US4645690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing a magnetic media
Assignee: Proterial Ltd
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Filing: 1985-02-01
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Granted: 1987-02-24
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Expires: 2005-02-01
Abstract
Abstract A manufacturing process of Co-Ni magnetic recording media by sputtering Co-Ni thin film layer on a substrate in Argon atmosphere including oxygen or air and heating the thin film to evaporate oxygen or air from the layer 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
- 👤 Shiro Murakami
- 👤 Shigeo Fujii
- 👤 Masayuki Nakao
- 👤 Yoshio Igarashi
- 👤 Juro Endo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:25
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/06; C23C14/14; C23C14/58; C23C14/5806; C23C14/5846; G; G11; G11B; G11B5/00; G11B5/62; G11B5/64; G11B5/65; G11B5/658; G11B5/84; G11B5/851; H; H01; H01F; H01F41/00; H01F41/14; H01F41/20; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
169 words
A process for manufacturing magnetic recording media comprising the steps of: sputtering a metal alloy comprised of nickel and cobalt as a thin film onto a non-magnetic substrate consisting essentially of an anodized aluminum alloy in an inert gas containing oxygen, said substrate being maintained at a temperature of from about room temperature to 300° C. during said sputtering step thereby forming an oxygen containing metal thin film comprised of oxygen and said metal alloy on said anodized aluminum alloy substrate; and heating said oxygen containing thin film and said substrate to evaporate the oxygen absorbed in said thin film during the sputtering step thereby forming a magnetic recording media with a metal alloy thin film on said substrate, said metal alloy thin film having a composition of less than 35 atomic % nickel with the balance being substantially cobalt, said metal alloy thin film having a hexagonal close-packed crystalline structure wherein the C-axes of the cobalt-nickel crystals forming said structure are in the plane of said recording media.
Claim 2
Dependent Claim
169 words
A process for manufacturing magnetic recording media comprising the steps of: sputtering a metal alloy comprised of nickel and cobalt as a thin film onto a non-magnetic substrate consisting essentially of an anodized aluminum alloy in an inert gas containing oxygen, said substrate being maintained at a temperature of from about room temperature to 300° C. during said sputtering step thereby forming an oxygen containing metal thin film comprised of oxygen and said metal alloy on said anodized aluminum alloy substrate; and heating said oxygen containing thin film and said substrate to evaporate the oxygen absorbed in said thin film during the sputtering step thereby forming a magnetic recording media with a metal alloy thin film on said substrate, said metal alloy thin film having a composition of less than 35 atomic % nickel with the balance being substantially cobalt, said metal alloy thin film having a hexagonal close-packed crystalline structure wherein the C-axes of the cobalt-nickel crystals forming said structure are in the plane of said recording media.
Claim 3
Dependent Claim
25 words
The process of claim 1 wherein said heating step reduces the amount of oxygen in said metal alloy thin film to about 1 atomic %.
Claim 4
Dependent Claim
18 words
The process as set forth in claim 1, wherein the thin film is 400 to 1,000 Å thick.
Claim 5
Dependent Claim
23 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.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-23 | 1990-08-25 | 1991-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-23 | 1994-08-25 | 1995-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-23 | 1998-08-25 | 1999-02-24 | $7700.00 | Window Closed / Lapsed |