US4623439A
Expired / Lapsed
US
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Thin film of Ni-Co-Fe ternary alloy and process for producing the same
Assignee: HGST Japan Ltd
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Filing: 1984-10-05
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Granted: 1986-11-18
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Expires: 2004-10-05
Abstract
Abstract A magnetic thin film of Ni-Co-Fe ternary alloy containing at most 75% by weight of Ni, 10 to 90% by weight of Co, and at most 15% by weight of Fe, which shows the magnetostriction constant between +2x10-6 to -2x10-6 and shows a uniaxial magnetic anisotropy of at most 10 Oe. The film is formed through the vacuum evaporation of the alloy during which two orthogonal external magnetic fields, directions x and y, are alternately applied over the deposition surface of a substrate. The film is suitable for a core material of a thin film magnetic head with a higher recording density.
Inventors
- 👤 Katsuya Mitsuoka
- 👤 Shinji Narishige
- 👤 Akira Kumagai
- 👤 Masaaki Sano
- 👤 Shinichi Hara
- 👤 Masanobu Hanazono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:31
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/22; C23C14/24; C23C14/06; C23C14/14; H; H01; H01F; H01F41/00; H01F41/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
114 words
A process for producing a thin film of Ni-Co-Fe ternary alloy containing at most 75% by weight of Ni, 10 to 90% by weight of Co, and at most 15% by weight of Fe comprising, a step of depositing the ternary alloy on a substrate; and a step of alternately applying a first external magnetic field with a predetermined strength and a second external magnetic field with a predetermined strength over the deposition surface of th substrate at a predetermined frequency during the deposition of the alloy, the first and second external magnetic fields being on a same plane parallel to the deposition surface of the substrate and crossing each other in right angle.
Claim 2
Dependent Claim
114 words
A process for producing a thin film of Ni-Co-Fe ternary alloy containing at most 75% by weight of Ni, 10 to 90% by weight of Co, and at most 15% by weight of Fe comprising, a step of depositing the ternary alloy on a substrate; and a step of alternately applying a first external magnetic field with a predetermined strength and a second external magnetic field with a predetermined strength over the deposition surface of th substrate at a predetermined frequency during the deposition of the alloy, the first and second external magnetic fields being on a same plane parallel to the deposition surface of the substrate and crossing each other in right angle.
Claim 3
Dependent Claim
44 words
A process for producing a thin film of Ni-Co-Fe ternary alloy as set forth in claim 1, wherein the deposition of the thin film is carried out by a method selected from among vacuum evaporation, sputtering, ion plating, and metal plating, by chemical deposition.
Claim 4
Dependent Claim
49 words
A process for producing a thin film of Ni-Co-Fe ternary alloy as set forth in claim 1, wherein the magneto-striction constant of the film is in the range of +2×10 -6 to -2×10 -6 and the film has a uniaxial magnetic anistropy which field is at most 10 Oe.
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) | 1989-11-17 | 1990-05-19 | 1990-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-17 | 1994-05-19 | 1994-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-17 | 1998-05-19 | 1998-11-18 | $7700.00 | Window Closed / Lapsed |