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US4504880A
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Integrated magnetic recording head assembly including an inductive write subassembly and a magnetoresistive read subassembly
Assignee: International Business Machines Corp
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Filing: 1982-08-09
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Granted: 1985-03-12
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Expires: 2002-08-09
Abstract
Abstract An integrated read/write head assembly incorporates a thin film inductive write head subassembly comprising first and second pole pieces that define a write transducing gap, and a magnetoresistive read subassembly disposed in the write gap. The first write pole piece is extended so as to provide a planar conductive path from the terminal connections or studs to the magnetoresistive read subassembly, thereby forming a uniform surface for deposition of the magnetoresistive read subassembly.
Inventors
- 👤 Mark A. Church
- 👤 Stephen K. Decker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:48
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G11B5/39; G11B5/3903; G11B5/3967
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
87 words
An integrated magnetic head assembly comprising: an inductive write head subassembly comprising first and second magnetic thin film pole pieces, said pole pieces defining a nonmagnetic transducing gap therebetween, said first pole piece being planar and extended; a read subassembly having a planar magnetoresistive element disposed in said gap, said element being electrically conductive; and planar conductive elements in electrical contact with said planar magnetoresistive element, said magnetoresistive element and said conductive elements having a planar area circumscribed by the periphery of said extended first pole piece.
Claim 2
Dependent Claim
87 words
An integrated magnetic head assembly comprising: an inductive write head subassembly comprising first and second magnetic thin film pole pieces, said pole pieces defining a nonmagnetic transducing gap therebetween, said first pole piece being planar and extended; a read subassembly having a planar magnetoresistive element disposed in said gap, said element being electrically conductive; and planar conductive elements in electrical contact with said planar magnetoresistive element, said magnetoresistive element and said conductive elements having a planar area circumscribed by the periphery of said extended first pole piece.
Claim 3
Dependent Claim
18 words
An integrated magnetic head assembly as in claim 1, wherein said transducing gap comprises two adjacent insulator layers.
Claim 4
Dependent Claim
22 words
An integrated magnetic head assembly as in claim 2, wherein said read subassembly is located between said two adjacent insulator gap layers.
Claim 5
Dependent Claim
22 words
An integrated magnetic head assembly as in claim 1, further including an air bearing slider for supporting said write and read subassemblies.
Claim 6
Dependent Claim
27 words
An integrated magnetic head assembly as in claim 1, wherein said read subassembly comprises a bias layer for determining the electrical current applied to said magnetoresistive element.
Claim 7
Dependent Claim
17 words
An integrated magnetic head assembly as in claim 5, wherein said bias layer is made of titanium.
Claim 8
Dependent Claim
30 words
An integrated magnetic head assembly as in claim 6, including an adhesion layer of titanium deposited over said first bias layer, on which adhesion layer said read assembly is deposited.
Claim 9
Dependent Claim
46 words
An integrated magnetic head assembly as in claim 1, including an electrical coil structure, a separation insulator layer disposed between said coil structure and said gap layers, and terminations for making electrical contact with said conductive elements at locations beyond the periphery of said separation layer.
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) | 1988-03-11 | 1988-09-10 | 1989-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-11 | 1992-09-10 | 1993-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-11 | 1996-09-10 | 1997-03-12 | $7700.00 | Window Closed / Lapsed |