Patent US4935311A successfully refreshed from Google Patents.
US4935311A
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Magnetic multilayered film and magnetic head using the same
Assignee: HGST Japan Ltd
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Filing: 1988-04-13
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Granted: 1990-06-19
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Expires: 2008-04-13
Abstract
Abstract Disclosed is a magnetic multilayered film in which layers of Fe or of an alloy containing Fe as an essential constituent are laminated together with intermediate layers of a nonmagnetic metal. In an embodiment of the magnetic multilayered film, each of the Fe layers or each of the Fe alloy layers is epitaxially grown on at least part of each of the intermediate layers of the nonmagnetic metal. A magnetic head having the magnetic multilayered film is also disclosed. The nonmagnetic metal is at least one of those selected from the group consisting of V, Cr, Cu, Nb, W, Al and Pt.
Inventors
- 👤 Ryoichi Nakatani
- 👤 Toshio Kobayashi
- 👤 Shigekazu Otomo
- 👤 Noriyuki Kumasaka
- 👤 Noritoshi Saito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:27
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/1278; B; B82; B82Y; B82Y25/00; G11B5/147; G11B5/31; H; H01; H01F; H01F10/00; H01F10/32; H01F10/324; H01F10/3254; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/928; Y10T; Y10T428/00; Y10T428/11; Y10T428/1107; Y10T428/1121; Y10T428/1129; Y10T428/12; Y10T428/12465; Y10T428/12493; Y10T428/12632; Y10T428/12771; Y10T428/12806; Y10T428/12812; Y10T428/12861; Y10T428/12951
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
67 words
A magnetic multilayered film comprising a plurality of layers of Fe or of an Fe-based alloy, said Fe layers of said Fe alloy layers being laminated together with a plurality of intermediate layers of a nonmagnetic metal, wherein each of said Fe layers or each of said Fe-based alloy layers is epitaxially grown on at least part of each of said intermediate layers of the nonmagnetic metal.
Claim 2
Dependent Claim
67 words
A magnetic multilayered film comprising a plurality of layers of Fe or of an Fe-based alloy, said Fe layers of said Fe alloy layers being laminated together with a plurality of intermediate layers of a nonmagnetic metal, wherein each of said Fe layers or each of said Fe-based alloy layers is epitaxially grown on at least part of each of said intermediate layers of the nonmagnetic metal.
Claim 3
Dependent Claim
32 words
A magnetic multilayered film according to claim 1, wherein said nonmagnetic metal is at least one of those selected from the group consisting of V, Cr, Cu, Nb, W, Al and Pt.
Claim 4
Dependent Claim
30 words
A magnetic multilayered film according to claim 2, wherein the thickness of the multilayered structure deposited in one period lies within the range of from 100 Å to 1,000 Å.
Claim 5
Dependent Claim
54 words
A magnetic multilayered film according to claim 1 wherein the crystal structure of said nonmagnetic metal is a body-centered cubic structure, a face-centered cubic structure or like structure, and the difference between the shortest atomic distance of said Fe or said Fe-based alloy and that of said nonmagnetic metal is smaller than 0.04 Å.
Claim 6
Dependent Claim
32 words
A magnetic multilayered film according to claim 1, which the thickness of each of said intermediate layers of the nonmagnetic metal lies within the range of from 10 Å to 100 Å.
Claim 7
Dependent Claim
30 words
A magnetic multilayered film according to claim 1, wherein the thickness of the multilayered structure deposited in one period lies within the range of from 100 Å to 1,000 Å.
Claim 8
Dependent Claim
21 words
A magnetic multilayered film according to claim 1, wherein said Fe-based alloy further contains 1 to 20% by atom of C.
Claim 9
Dependent Claim
79 words
A magnetic head including a magnetic film in at least part of its magnetic circuit, said magnetic film having a multilayered film structure in which a plurality of layers of Fe or of an Fe-based alloy are laminated together with a plurality of intermediate layers of a nonmagnetic metal, wherein each of said Fe layers or each of said Fe-based alloy layers is epitaxially grown on at least part of each of said intermediate layers of the nonmagnetic metal.
Claim 10
Dependent Claim
79 words
A magnetic head including a magnetic film in at least part of its magnetic circuit, said magnetic film having a multilayered film structure in which a plurality of layers of Fe or of an Fe-based alloy are laminated together with a plurality of intermediate layers of a nonmagnetic metal, wherein each of said Fe layers or each of said Fe-based alloy layers is epitaxially grown on at least part of each of said intermediate layers of the nonmagnetic metal.
Claim 11
Dependent Claim
31 words
A magnetic head according to claim 8, wherein said nonmagnetic metal is at least one of those selected from the group consisting of V, Cr, Cu, Nb, W, Al and Pt.
Claim 12
Dependent Claim
37 words
A magnetic head according to claim 8, wherein each of said Fe layers or each of said Fe-based alloy layers is epitaxially grown on at least part of each of said intermediate layers of the nonmagnetic metal.
Claim 13
Dependent Claim
53 words
A magnetic head according to claim 10, wherein the crystal structure of said nonmagnetic metal is a body-centered cubic structure, a face-centered cubic structure or like structure, and the difference between the shortest atomic distance of said Fe or said Fe-based alloy and that of said nonmagnetic metal is smaller than 0.04 Å.
Claim 14
Dependent Claim
52 words
A magnetic head according to claim 8, wherein the thickness of each of said intermediate layers of the nonmagnetic metal lies within the range of from 10 Åto 100 Å, and the thickness of the multilayered structure deposited in one period lies within the range of from 100 Å to 1,000 Å.
Claim 15
Dependent Claim
20 words
A magnetic head according to claim 8, wherein said Fe-based alloy further contains 1 to 20% by atom of C.
Claim 16
Dependent Claim
51 words
A magnetic multilayered film comprising a plurality of layers of Fe or of an alloy containing Fe as an essential constituent and further containing 1 to 20% by atom C, said Fe layers or said Fe alloy layers being laminated together with a plurality of intermediate layers of a non-magnetic metal.
Claim 17
Dependent Claim
51 words
A magnetic multilayered film comprising a plurality of layers of Fe or of an alloy containing Fe as an essential constituent and further containing 1 to 20% by atom C, said Fe layers or said Fe alloy layers being laminated together with a plurality of intermediate layers of a non-magnetic metal.
Claim 18
Dependent Claim
63 words
A magnetic head including a magnetic film in at least part of its magnetic circuit, said magnetic film having a multilayered film structure in which a plurality of layers of Fe or of an alloy containing Fe as an essential constituent and further containing 1 to 20% by atom C are laminated together with a plurality of intermediate layers of a nonmagnetic metal.
Claim 19
Dependent Claim
63 words
A magnetic head including a magnetic film in at least part of its magnetic circuit, said magnetic film having a multilayered film structure in which a plurality of layers of Fe or of an alloy containing Fe as an essential constituent and further containing 1 to 20% by atom C are laminated together with a plurality of intermediate layers of a nonmagnetic metal.
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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) | 1993-06-18 | 1993-12-18 | 1994-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-18 | 1997-12-18 | 1998-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-18 | 2001-12-18 | 2002-06-19 | $7700.00 | Window Closed / Lapsed |