Patent US3887944A successfully refreshed from Google Patents.
US3887944A
Expired / Lapsed
US
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Method for eliminating part of magnetic crosstalk in magnetoresistive sensors
Assignee: International Business Machines Corp
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Filing: 1973-06-29
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Granted: 1975-06-03
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Expires: 1993-06-29
Abstract
Abstract Elimination of crosstalk in an integrated array of magnetoresistive reading heads by the use of regions of high coercivity material between the active areas of closely spaced magnetoresistive sensors so as to prevent flux coupling between such closely spaced sensors.
Inventors
- 👤 Christopher H Bajorek
- 👤 David A Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:18
CPC Classifications
B; B82; B82Y; B82Y25/00; G; G01; G01R; G01R33/00; G01R33/02; G01R33/06; G01R33/09; G01R33/093; G11; G11B; G11B5/00; G11B5/127; G11B5/29; G11B5/33; G11B5/39; G11B5/3903; G11B5/3967; G11B5/397; G11B5/3977; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0866
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
51 words
An integrated array of magnetic recording elements comprising a substrate, a thin film of magnetoresistive material on said substrate, a plurality of spaced electrical conductors each of which overlaps a separate region of said magnetoresistive material, and a high coercivity material interposed between said magnetoresistive material and its corresponding overlapped conductors.
Claim 2
Dependent Claim
51 words
An integrated array of magnetic recording elements comprising a substrate, a thin film of magnetoresistive material on said substrate, a plurality of spaced electrical conductors each of which overlaps a separate region of said magnetoresistive material, and a high coercivity material interposed between said magnetoresistive material and its corresponding overlapped conductors.
Claim 3
Dependent Claim
51 words
An integrated array of magnetic recording elements comprising a substrate, a thin film of magnetoresistive material on said substrate, a plurality of spaced electrical conductors each of which overlaps a separate region of said magnetoresistive material, and a high coercivity material interposed between said magnetoresistive material and its corresponding overlapped conductors.
Claim 4
Dependent Claim
51 words
An integrated array of magnetic recording elements comprising a substrate, a thin film of magnetoresistive material on said substrate, a plurality of spaced electrical conductors each of which overlaps a separate region of said magnetoresistive material, and a high coercivity material interposed between said magnetoresistive material and its corresponding overlapped conductors.
Claim 5
Dependent Claim
25 words
The integrated array of claim 1 wherein said high coercivity material is coterminous with the junction area of said magnetoresistive material and its intersecting conductor.
Claim 6
Dependent Claim
36 words
The integrated array of claim 1 wherein said high coercivity material has a coercivity that is at least one order higher than the coercivity of the magnetoresistive areas of said stripe that lie between said conductors.
Claim 7
Dependent Claim
13 words
The integrated array of claim 1 wherein said high coercivity materials is Ni-Co-P.
Claim 8
Dependent Claim
13 words
The integrated array of claim 1 wherein said high coercivity material is CoP.
Claim 9
Dependent Claim
14 words
The integrated array of claim 1 wherein said high coercivity material is gamma -Fe2O3.
Claim 10
Dependent Claim
13 words
The integrated array of claim 1 wherein said high coercivity material is Fe3O4.
Claim 11
Dependent Claim
18 words
The integrated array of claim 1 wherein said magnetoresistive stripe is magnetized at any angle to the stripe.
Claim 12
Dependent Claim
54 words
An integrated array of magnetic recording elements comprising a substrate, a thin magnetoresistive film on said substrate, a plurality of spaced electrical conductors connected to said magnetoresistive material, and a magnetic switching inhibiting means interposed between said magnetoresistive material and each of said conductors at those regions where the conductors contact said magnetoresistive film.
Claim 13
Dependent Claim
54 words
An integrated array of magnetic recording elements comprising a substrate, a thin magnetoresistive film on said substrate, a plurality of spaced electrical conductors connected to said magnetoresistive material, and a magnetic switching inhibiting means interposed between said magnetoresistive material and each of said conductors at those regions where the conductors contact said magnetoresistive film.
Claim 14
Dependent Claim
16 words
The integrated array of claim 9 wherein said magnetic switching inhibiting means is an antiferromagnetic material.
Claim 15
Dependent Claim
15 words
The integrated array of claim 9 wherein said magnetic switching inhibiting means is Alpha -Fe2O3.
Claim 16
Dependent Claim
14 words
The integrated array of claim 9 wherein said magnetic switchIng inhibiting means is NiO.
Claim 17
Dependent Claim
32 words
The integrated array of claim 9 wherein said magnetic switching inhibiting means comprises a chemically treated region over those portions of said thin magnetoresistive film that are connected to said electrical conductors.
Claim 18
Dependent Claim
30 words
The integrated array of claim 9 wherein said magnetic switching inhibiting means comprises a material which renders said underlying magnetoresistive material less permeable by an order of magnitude or more.
Claim 19
Dependent Claim
111 words
An integrated array of magnetic recording elements comprising a substrate, a thin film strip of magnetoresistive material on said substrate, a plurality of spaced thin film electrical conductor leads spaced in an array, said leads overlapping a separate region of said magnetoresistive strip, and a plurality of high coercivity film material sections, each being interposed between said magnetoresistive strip and one of said corresponding overlapped conductor leads, each adjacent pair of said leads and said high coercivity sections comprising a separate magnetoresistive recording element in combination with the segment of said magnetoresistive strip therebetween, whereby said high coercivity material provides low magnetic field coupling between adjacent segments of said magnetoresistive strip.
Claim 20
Dependent Claim
111 words
An integrated array of magnetic recording elements comprising a substrate, a thin film strip of magnetoresistive material on said substrate, a plurality of spaced thin film electrical conductor leads spaced in an array, said leads overlapping a separate region of said magnetoresistive strip, and a plurality of high coercivity film material sections, each being interposed between said magnetoresistive strip and one of said corresponding overlapped conductor leads, each adjacent pair of said leads and said high coercivity sections comprising a separate magnetoresistive recording element in combination with the segment of said magnetoresistive strip therebetween, whereby said high coercivity material provides low magnetic field coupling between adjacent segments of said magnetoresistive strip.
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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) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |