US5155642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anisotropy configuration for longitudinally constrained magnetoresistive transducers
Assignee: International Business Machines Corp
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Filing: 1991-06-11
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Granted: 1992-10-13
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Expires: 2011-06-11
Abstract
Abstract A magnetoresistive (MR) read transducer comprising an MR layer having longitudinally magnetized end regions separated by a central active region and a soft magnetic biasing layer parallel to but spaced from the MR layer. The easy axes of the MR layer and the soft magnetic biasing layer are tilted at a small angle with respect to the longitudinal axis of the transducer and these angles are substantially equal, but in the opposite sense.
Inventors
- 👤 Otto Voegeli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:18
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G11B5/39; G11B5/3903
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
152 words
A magnetoresistive read transducer assembly comprising: a thin film magnetoresistive conductive layer formed of magnetic material, said magnetoresistive conductive layer having longitudinally magnetized end regions separated by a central region, and a longitudinal axis aligned parallel to said magnetoresistive conductive layer; and a thin film of soft magnetic bias material parallel to but spaced from said magnetoresistive conductive layer; said thin film magnetoresistive conductive layer having an easy axis which is tilted at a predetermined angle with respect to said longitudinal axis, said thin film of soft magnetic bias material having an easy axis tilted by an angle substantially the same as said predetermined angle with respect to said longitudinal axis but having an opposite sense of tilt to the easy axis of said thin film magnetoresistive conductive layer whereby a transverse bias is produced in said central region of said transducer assembly of a level sufficient to insure stable operating characteristics.
Claim 2
Dependent Claim
152 words
A magnetoresistive read transducer assembly comprising: a thin film magnetoresistive conductive layer formed of magnetic material, said magnetoresistive conductive layer having longitudinally magnetized end regions separated by a central region, and a longitudinal axis aligned parallel to said magnetoresistive conductive layer; and a thin film of soft magnetic bias material parallel to but spaced from said magnetoresistive conductive layer; said thin film magnetoresistive conductive layer having an easy axis which is tilted at a predetermined angle with respect to said longitudinal axis, said thin film of soft magnetic bias material having an easy axis tilted by an angle substantially the same as said predetermined angle with respect to said longitudinal axis but having an opposite sense of tilt to the easy axis of said thin film magnetoresistive conductive layer whereby a transverse bias is produced in said central region of said transducer assembly of a level sufficient to insure stable operating characteristics.
Claim 3
Dependent Claim
16 words
The magnetoresistive read transducer assembly of claim 1 wherein said predetermined angle is an acute angle.
Claim 4
Dependent Claim
19 words
The magnetoresistive read transducer assembly of claim 2 wherein said predetermined angle is between about 5 and 30 degrees.
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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) | 1995-10-13 | 1996-04-13 | 1996-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-13 | 2000-04-13 | 2000-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-13 | 2004-04-13 | 2004-10-13 | $7700.00 | Window Closed / Lapsed |