US5262914A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetoresistive head with enhanced exchange bias field
Assignee: International Business Machines Corp
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Filing: 1991-10-18
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Granted: 1993-11-16
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Expires: 2011-10-18
Abstract
Abstract A magnetoresistive (MR) read transducer in which a layered structure comprising an MR layer, an antiferromagnetic material in direct contact with the MR layer and a thin layer of interdiffusion material in contact with the layer of antiferromagnetic material is subjected to a heating process to a temperature within a chosen temperature for a chosen time to form a magnetic interface between the antiferromagnetic material the MR layer. The magnetic interface produces a high level of exchange bias with the MR layer.
Inventors
- 👤 Mao-Min Chen
- 👤 Ching H. Tsang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:45
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G11B5/39; G11B5/3903; G11B5/399
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
68 words
A magnetoresistive read transducer assembly comprising: a thin magnetoresistive layer of ferromagnetic material; a thin layer of antiferromagnetic material in direct contact with the magnetoresistive layer; a thin layer of an interdiffusion material in contact with the layer of antiferromagnetic material; and a thermally formed magnetic interface between said antiferromagnetic material and said magnetoresistive layer whereby said magnetic interface produces an exchange bias field to said magnetoresistive layer.
Claim 2
Dependent Claim
68 words
A magnetoresistive read transducer assembly comprising: a thin magnetoresistive layer of ferromagnetic material; a thin layer of antiferromagnetic material in direct contact with the magnetoresistive layer; a thin layer of an interdiffusion material in contact with the layer of antiferromagnetic material; and a thermally formed magnetic interface between said antiferromagnetic material and said magnetoresistive layer whereby said magnetic interface produces an exchange bias field to said magnetoresistive layer.
Claim 3
Dependent Claim
15 words
The magnetoresistive read transducer of claim 1 wherein said interdiffusion material comprises a noble metal.
Claim 4
Dependent Claim
24 words
The magnetoresistive read transducer of claim 2 wherein said noble metal is taken from the group consisting of gold, rhodium, platinum, palladium, and ruthenium.
Claim 5
Dependent Claim
29 words
The magnetoresistive read transducer of claim 1 wherein said magnetoresistive layer comprises an alloy of nickel and iron and said antiferromagnetic layer comprises an alloy of iron and manganese.
Claim 6
Dependent Claim
15 words
The magnetoresistive read transducer of claim 4 wherein said interdiffusion material comprises a noble metal.
Claim 7
Dependent Claim
23 words
The magnetoresistive read transducer of claim 5 wherein said noble metal is taken from the group consisting of gold, rhodium, platinum and palladium.
Claim 8
Dependent Claim
13 words
The magnetoresistive read transducer of claim 6 wherein said noble metal is gold.
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) | 1996-11-15 | 1997-05-17 | 1997-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-15 | 2001-05-17 | 2001-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-15 | 2005-05-17 | 2005-11-16 | $7700.00 | Window Closed / Lapsed |