US5296987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tapered conductors for magnetoresistive transducers
Assignee: HP Inc
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Filing: 1992-06-05
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Granted: 1994-03-22
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Expires: 2012-06-05
Abstract
Abstract A method for reducing Barkhausen noise in dual stripe magnetoresistive recording heads. The topography of the bottom conductor is controlled, specifically the conductor sidewall angle at the edge of the track is defined to be less than 45° from the substrate plane. Restricting the conductor sidewall profile in this manner eliminates sources of magnetic domain nucleation.
Inventors
- 👤 Thomas C. Anthony
- 👤 James A. Brug
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:58
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G11B5/39; G11B5/3903; G11B5/3906; G11B5/3945; G11B5/3948; G11B5/3951; G11B5/3954
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
81 words
In a magnetoresistive transducer, a method for reducing Barkhausen noise, comprising the step of: forming a first conductor for supplying current to an associated magnetoresistive stripe, said magnetoresistive stripe being located above said conductor and traversing a conductor edge, said conductor having a tapered portion at an edge of a transducer track region, wherein said first conductor tapered portion is formed at an angle between about 10° and 65°, and preferably between about 15° and 45°, relative to a transducer substrate.
Claim 2
Dependent Claim
81 words
In a magnetoresistive transducer, a method for reducing Barkhausen noise, comprising the step of: forming a first conductor for supplying current to an associated magnetoresistive stripe, said magnetoresistive stripe being located above said conductor and traversing a conductor edge, said conductor having a tapered portion at an edge of a transducer track region, wherein said first conductor tapered portion is formed at an angle between about 10° and 65°, and preferably between about 15° and 45°, relative to a transducer substrate.
Claim 3
Dependent Claim
76 words
In a dual stripe magnetoresistive transducer, a method for reducing Barkhausen noise, comprising the step of: forming a first conductor for supplying current to an associated magnetoresistive stripe which is formed above said conductor, said conductor having a tapered portion at an edge of a transducer track region, wherein said first conductor tapered portion is formed at an angle between about 10° and 65°, and preferably between about 15° and 45°, relative to a transducer substrate.
Claim 4
Dependent Claim
76 words
In a dual stripe magnetoresistive transducer, a method for reducing Barkhausen noise, comprising the step of: forming a first conductor for supplying current to an associated magnetoresistive stripe which is formed above said conductor, said conductor having a tapered portion at an edge of a transducer track region, wherein said first conductor tapered portion is formed at an angle between about 10° and 65°, and preferably between about 15° and 45°, relative to a transducer substrate.
Claim 5
Dependent Claim
34 words
The method of claim 2, further comprising the step of: forming a first and a second magnetoresistive stripe such that said stripes are situated above and traverse a topography produced by said first conductor.
Claim 6
Dependent Claim
43 words
The method of claim 2, further comprising the step of: forming a first magnetoresistive stripe beneath said first conductor; and forming a second magnetoresistive stripe such that said second magnetoresistive stripe is situated above and traverses a topography produced by said first conductor.
Claim 7
Dependent Claim
68 words
A magnetoresistive transducer, comprising: a first conductor for supplying current to an associated magnetoresistive stripe, said magnetoresistive stripe being situated above and traversing a conductor edge, said conductor having a tapered portion at an edge of a transducer track region, wherein said first conductor tapered portion is formed at an angle between about 10° and 65°, and preferably between about 15° and 45°, relative to a transducer substrate.
Claim 8
Dependent Claim
68 words
A magnetoresistive transducer, comprising: a first conductor for supplying current to an associated magnetoresistive stripe, said magnetoresistive stripe being situated above and traversing a conductor edge, said conductor having a tapered portion at an edge of a transducer track region, wherein said first conductor tapered portion is formed at an angle between about 10° and 65°, and preferably between about 15° and 45°, relative to a transducer substrate.
Claim 9
Dependent Claim
66 words
A dual stripe magnetoresistive transducer, comprising: a first conductor for supplying current to an associated magnetoresistive stripe which is formed above said first conductor, said conductor having a tapered portion at an edge of a transducer track region, wherein said first conductor tapered portion is formed at an angle between about 10° and 65°, and preferably between about 15° and 45°, relative to a transducer substrate.
Claim 10
Dependent Claim
66 words
A dual stripe magnetoresistive transducer, comprising: a first conductor for supplying current to an associated magnetoresistive stripe which is formed above said first conductor, said conductor having a tapered portion at an edge of a transducer track region, wherein said first conductor tapered portion is formed at an angle between about 10° and 65°, and preferably between about 15° and 45°, relative to a transducer substrate.
Claim 11
Dependent Claim
35 words
The transducer of claim 6, further comprising: a first magnetoresistive stripe and a second magnetoresistive stripe, said stripes formed such that both stripes are situated above and traverse a topography produced by said first conductor.
Claim 12
Dependent Claim
40 words
The transducer of claim 6, further comprising: a first magnetoresistive stripe formed beneath said first conductor; and a second magnetoresistive stripe formed such that said second magnetoresistive stripe is situated above and traverses a topography produced by said first conductor.
References Cited (Backward Citations)
US3860965A
Cited
US4686472A
Cited
US4814918A
Cited
US4803580A
Cited
US4782414A
Cited
US5168409A
Cited
US5140884A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-03-21 | 1997-09-20 | 1998-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-03-21 | 2001-09-20 | 2002-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-03-21 | 2005-09-20 | 2006-03-22 | $7700.00 | Window Closed / Lapsed |