US4567116A
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Magnetic recording medium
Assignee: Tohoku Steel Co Ltd
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Filing: 1984-07-27
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Granted: 1986-01-28
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Expires: 2004-07-27
Abstract
Abstract A magnetic recording medium having a magnetic layer formed by a thin film deposition method, characterized in that the magnetic layer contains Fe as the principal component, Co, Ni and at least one of Mn, Cu, V, Nb, Ta, Mo, W, Ti, Zr and Hf.
Inventors
- 👤 Takeshi Sawada
- 👤 Akira Shinmi
- 👤 Hiroshi Takagi
- 👤 Kenji Suzuki
- 👤 Fumio Kishi
- 👤 Susumu Kozuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:27
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/64; G11B5/65; G11B5/656; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
67 words
A magnetic recording medium having a thin ferromagnetic corrosion resistant metallic film formed by an oblique incidence deposition method, characterized in that a composition of the thin ferromagnetic metallic film is represented by the formula (Fe.sub.1-x Co.sub.x).sub.1-(a+b) Ni.sub.a X.sub.b wherein, X denotes Mn and/or Cu, x denotes a weight fraction satisfying 0<x<0.5, a denotes a weight fraction satisfying 0.05<a<0.25, and b denotes a weight fraction satisfying 0.01<b<0.20.
Claim 2
Dependent Claim
67 words
A magnetic recording medium having a thin ferromagnetic corrosion resistant metallic film formed by an oblique incidence deposition method, characterized in that a composition of the thin ferromagnetic metallic film is represented by the formula (Fe.sub.1-x Co.sub.x).sub.1-(a+b) Ni.sub.a X.sub.b wherein, X denotes Mn and/or Cu, x denotes a weight fraction satisfying 0<x<0.5, a denotes a weight fraction satisfying 0.05<a<0.25, and b denotes a weight fraction satisfying 0.01<b<0.20.
Claim 3
Dependent Claim
40 words
The magnetic recording medium according to claim 1, wherein the composition of the thin ferromagnetic metallic film contains 2-10 wt. % of Mn and/or Cu, 8-20 wt. % of Ni, 15-40 wt. % of Co and the remainder of Fe.
Claim 4
Dependent Claim
40 words
The magnetic recording medium according to claim 1, wherein the composition of the thin ferromagnetic metallic film contains 2-9 wt. % of Mn and/or Cu, 10-16 wt. % of Ni, 20-30 wt. % of Co, and the remainder of Fe.
Claim 5
Dependent Claim
74 words
A magnetic recording medium having a thin ferromagnetic corrosion resistant metallic film formed by an oblique incidence deposition method, characterized in that a composition of the thin ferromagnetic metallic film is represented by the formula (Fe.sub.1-x Co.sub.x).sub.1-(a+b) Ni.sub.a Y.sub.b wherein, Y denotes at least one of V, Nb, Ta, Mo and W, x denotes a weight fraction satisfying 0<x≦0.5, a denotes a weight fraction satisfying 0.05≦a≦0.25, and b denotes a weight fraction satisfying 0.005≦b≦0.12.
Claim 6
Dependent Claim
74 words
A magnetic recording medium having a thin ferromagnetic corrosion resistant metallic film formed by an oblique incidence deposition method, characterized in that a composition of the thin ferromagnetic metallic film is represented by the formula (Fe.sub.1-x Co.sub.x).sub.1-(a+b) Ni.sub.a Y.sub.b wherein, Y denotes at least one of V, Nb, Ta, Mo and W, x denotes a weight fraction satisfying 0<x≦0.5, a denotes a weight fraction satisfying 0.05≦a≦0.25, and b denotes a weight fraction satisfying 0.005≦b≦0.12.
Claim 7
Dependent Claim
47 words
The magnetic recording medium according to claim 4, wherein the composition of the thin ferromagnetic metallic film contains 2-10 wt. % of at least one of V, Nb, Ta, Mo and W, 8-20 wt. % of Ni, 15-40 wt. % of Co, and the remainder of Fe.
Claim 8
Dependent Claim
47 words
The magnetic recording medium according to claim 4, wherein the composition of the thin ferromagnetic metallic film contains 2-9 wt. % of at least one of V, Nb, Ta, Mo and W, 10-16 wt. % of Ni, 20-30 wt. % of Co, and the remainder of Fe.
Claim 9
Dependent Claim
73 words
A magnetic recording medium having a thin ferromagnetic corrosion resistant metallic film formed by an oblique incidence deposition method, characterized in that a composition of the thin ferromagnetic metal film layer is represented by the formula (Fe.sub.1-x Co.sub.x)1-(a+b).sup.Ni a.sup.z b wherein Z denotes at least one of Ti, Zr and Hf, x denotes a weight fraction satisfying 0<x≦0.5, a denotes a weight fraction satisfying 0.05≦a≦0.25, and b denotes a weight fraction satisfying 0.01≦b≦0.12.
Claim 10
Dependent Claim
73 words
A magnetic recording medium having a thin ferromagnetic corrosion resistant metallic film formed by an oblique incidence deposition method, characterized in that a composition of the thin ferromagnetic metal film layer is represented by the formula (Fe.sub.1-x Co.sub.x)1-(a+b).sup.Ni a.sup.z b wherein Z denotes at least one of Ti, Zr and Hf, x denotes a weight fraction satisfying 0<x≦0.5, a denotes a weight fraction satisfying 0.05≦a≦0.25, and b denotes a weight fraction satisfying 0.01≦b≦0.12.
Claim 11
Dependent Claim
45 words
The magnetic recording medium according to claim 7, wherein the composition of the thin ferromagnetic metallic film contains 2-8 wt. % of at least one of Ti, Zr and Hf, 8-20 wt. % of Ni, 15-40 wt. % of Co, and the remainder of Fe.
Claim 12
Dependent Claim
45 words
The magnetic recording medium according to claim 7, wherein the composition of the thin ferromagnetic metallic film contains 3-6 wt. % of at least one of Ti, Zr, and Hf, 10-16 wt. % of Ni, 20-30 wt. % of Co, and the remainder of Fe.
Claim 13
Dependent Claim
23 words
The magnetic recording medium according to claim 1, wherein the composition of the thin ferromagnetic metallic film contains 50-60 wt. % of Fe.
Claim 14
Dependent Claim
23 words
The magnetic recording medium according to claim 1, wherein the composition of the thin ferromagnetic metallic film contains 54-60 wt. % of Fe.
Claim 15
Dependent Claim
23 words
The magnetic recording medium according to claim 4, wherein the composition of the thin ferromagnetic metallic film contains 50-60 wt. % of Fe.
Claim 16
Dependent Claim
23 words
The magnetic recording medium according to claim 4, wherein the composition of the thin ferromagnetic metallic film contains 54-60 wt. % of Fe.
Claim 17
Dependent Claim
23 words
The magnetic recording medium according to claim 7, wherein the composition of the thin ferromagnetic metallic film contains 50-60 wt. % of Fe.
Claim 18
Dependent Claim
23 words
The magnetic recording medium according to claim 7, wherein the composition of the thin ferromagnetic metallic film contains 54-60 wt. % of Fe.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-27 | 1989-07-29 | 1990-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-27 | 1993-07-29 | 1994-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-27 | 1997-07-29 | 1998-01-28 | $7700.00 | Window Closed / Lapsed |