US3848217A
Expired / Lapsed
US
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Magnetoresistive devices and transducers
Assignee: CO INT POUR L INF
•
Filing: 1972-12-15
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Granted: 1974-11-12
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Expires: 1992-12-15
Abstract
Abstract A magnetoresistive device responsive to the value and direction of an external magnetic field generated near an edge thereof by a localized source by a corresponding variation of an electrical current applied thereto comprises at least one magnetoresistive layer of anisotropic material having its easy axis of magnetization orientated at an angle which lies between 0* and 90* and preferably approximately 45* with respect to the direction of flow of electrical current through the device. The magnetoresistive layer is inserted between a pair of thicker high permeability magnetic layers when a more accurate localization of the source of the external magnetic field is required.
Inventors
- 👤 J Lazzari
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:18
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G11B5/39; G11B5/3903; G11B5/3906; G11B5/3912; G11B5/31; G11B5/3109; G11B5/313; G11B5/3143; G11B5/3146; G11B5/3153; G11B5/3967; G11B5/398; H; H10; H10N; H10N50/00; H10N50/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
67 words
A magnetoresistive device comprising: a layer of magnetoresistive anisotropic material, having an easy axis of magnetization at substantially 45* to the direction of electrical current flow therethrough; a pair of layers of high permeability magnetic material, thicker tHan and sandwiched around said magnetoresistive layer; and electrically insulating films one positioned between each magnetoresistive and magnetic layers respectively to effect magnetostatic coupling between said magnetoresistive and magnetic layers.
Claim 2
Dependent Claim
67 words
A magnetoresistive device comprising: a layer of magnetoresistive anisotropic material, having an easy axis of magnetization at substantially 45* to the direction of electrical current flow therethrough; a pair of layers of high permeability magnetic material, thicker tHan and sandwiched around said magnetoresistive layer; and electrically insulating films one positioned between each magnetoresistive and magnetic layers respectively to effect magnetostatic coupling between said magnetoresistive and magnetic layers.
Claim 3
Dependent Claim
39 words
A magnetoresistive device as defined by claim 1 in which said magnetoresistive layer has a zigzag shape, the segments of which are inclined with respect to an edge thereof to which the axis of easy magnetization is substantially parallel.
Claim 4
Dependent Claim
34 words
A magnetoresistive device as defined by claim 1 wherein said magnetoresistive layer is U-shaped and the lower branch of the ''''U'''' has its easy access of magnetization inclined with respect to the edge thereof.
Claim 5
Dependent Claim
35 words
A magnetoresistive device according to claim 1, wherein each thicker high permeability layer is of the same material as the magnetoresistive thin layer and is at least four times thicker than the said magnetoresistive layer.
Claim 6
Dependent Claim
26 words
A magnetoresistive device according to claim 4, wherein the magnetoresistive layer has an edge recessed with respect to the corresponding edges of the said thicker layers.
References Cited (Backward Citations)
US3493694A
Cited
US3480926A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |