US5018037A
Expired / Lapsed
US
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Magnetoresistive read transducer having hard magnetic bias
Assignee: HGST Netherlands BV
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Filing: 1989-10-10
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Granted: 1991-05-21
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Expires: 2009-10-10
Abstract
Abstract A magnetoresistive (MR) read transducer having passive end regions separated by a central active region in which an MR layer is formed which extends over substantially only the central active region and in which a hard magnetic layer is formed in each end region. The hard magnetic layers form an abutting junction having electrical and magnetic continuity with the MR layer to produce a longitudinal bias in the MR sensor. The transducer is produced by a method in which the same stencil defines the extent of both the MR layer and the hard magnetic layers so that the abutting junctions are formed easily and reliably.
Inventors
- 👤 Mohamad T. Krounbi
- 👤 Otto Voegeli
- 👤 Po-Kang Wang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:10
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G11B5/39; G11B5/3903
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
105 words
A magnetoresistive read transducer comprising; a magnetoresistive sensor having passive end regions separated by a central active region; a thin film of magnetoresistive conductive layer formed of magnetic material, said magnetoresistive conductive layer extending over substantially only said central active a first and a second thin film of hard magnetic material, each of said thin film of hard magnetic material forming an abutting junction having electrical and magnetic continuity with one end of said magnetoresistive conductive layer, each of said thin film of hard magnetic material extending over substantially only one of said passive end regions to produce a longitudinal bias in said magnetoresistive sensor.
Claim 2
Dependent Claim
105 words
A magnetoresistive read transducer comprising; a magnetoresistive sensor having passive end regions separated by a central active region; a thin film of magnetoresistive conductive layer formed of magnetic material, said magnetoresistive conductive layer extending over substantially only said central active a first and a second thin film of hard magnetic material, each of said thin film of hard magnetic material forming an abutting junction having electrical and magnetic continuity with one end of said magnetoresistive conductive layer, each of said thin film of hard magnetic material extending over substantially only one of said passive end regions to produce a longitudinal bias in said magnetoresistive sensor.
Claim 3
Dependent Claim
15 words
The magnetoresistive read transducer of claim 1 wherein said abutting junction comprises two overlapping tapers.
Claim 4
Dependent Claim
16 words
The magnetoresistive read transducer of claim 2 wherein said overlapping tapers comprise a continuous curved surface.
Claim 5
Dependent Claim
25 words
The magnetoresistive read transducer of claim 1 wherein said abutting junction has a length between 3 and 5 times the thickness of said magnetoresistive layer.
Claim 6
Dependent Claim
25 words
The magnetoresistive read transducer of claim 1 additionally comprising means for producing a transverse bias in at least a part of said central active region.
Claim 7
Dependent Claim
25 words
The magnetoresistive read transducer of claim 5 wherein said means for producing a transverse bias comprises a soft magnetic film spaced from said magnetoresistive layer.
References Cited (Backward Citations)
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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) | 1994-05-20 | 1994-11-19 | 1995-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-20 | 1998-11-19 | 1999-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-20 | 2002-11-19 | 2003-05-21 | $7700.00 | Window Closed / Lapsed |