US4271232A
Expired / Lapsed
US
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Amorphous magnetic film
Assignee: International Business Machines Corp
•
Filing: 1978-08-28
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Granted: 1981-06-02
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Expires: 1998-08-28
Abstract
Abstract A magnetic material of amorphous iron-nitride and a method for preparing the same are provided.
Inventors
- 👤 Neil D. Heiman
- 👤 Robert L. White
- 👤 Robert I. Potter
- 👤 Paul A. Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:20
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/06; C23C14/0641; H; H01; H01F; H01F10/00; H01F10/08; H01F10/10; H01F10/12; H01F10/13; H01F10/131; H01F10/18; H01F10/187; H01F41/00; H01F41/14; H01F41/18; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
77 words
A thin film magnetic material for use as magnetic recording media comprising an amorphous iron-nitride film having a coercivity of at least about 200 oersteds and high corrosion resistance and wherein the atomic percent of of Fe in said material is from about 70 to >40% and the atomic percent of N in said material is from about 30 to <60%, said atomic percent being based upon the total atoms of Fe and N in the material.
Claim 2
Dependent Claim
77 words
A thin film magnetic material for use as magnetic recording media comprising an amorphous iron-nitride film having a coercivity of at least about 200 oersteds and high corrosion resistance and wherein the atomic percent of of Fe in said material is from about 70 to >40% and the atomic percent of N in said material is from about 30 to <60%, said atomic percent being based upon the total atoms of Fe and N in the material.
Claim 3
Dependent Claim
17 words
The material of claim 1 wherein said film has a coercivity of at least about 400 oersteds.
Claim 4
Dependent Claim
15 words
The material of claim 2 wherein said film contains 0 to 2 atomic percent argon.
Claim 5
Dependent Claim
37 words
The material of claim 1 wherein said atomic percent of Fe in said material is from about 70 to about 50% and said atomic percent of N in said material is from about 30% to about 50%.
Claim 6
Dependent Claim
11 words
The material of claim 1 wherein coercivity is about 600 oersteds.
Claim 7
Dependent Claim
37 words
The method of claim 1 wherein said atomic percent of Fe in said material is from about 58 to about 70% and said atomic percent of N in said material is from about 30 to about 42%.
Claim 8
Dependent Claim
37 words
The material of claim 1 wherein said atomic percent of Fe in said material is from about 58 to about 64% and said atomic percent of N in said material is from about 36 to about 42%.
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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) | 1984-06-01 | 1984-12-01 | 1985-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-01 | 1988-12-01 | 1989-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-01 | 1992-12-01 | 1993-06-02 | $7700.00 | Window Closed / Lapsed |