US4477794A
Expired / Lapsed
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Magnetoresistive element
Assignee: Panasonic Holdings Corp
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Filing: 1982-08-10
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Granted: 1984-10-16
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Expires: 2002-08-10
Abstract
Abstract The invention provides a magnetoresistive element which magnetostatically has magnetic anisotropy to control a domain structure and which eliminates Barkhousen noise that will cause abrupt movement of domain walls and irregular magnetization due to a change in the signal magnetic field, wherein a grating pattern is formed on at least one surface of a magnetoresistive film by a process in which a grating pattern is unidirectionally formed on the surface of a substrate and the magnetoresistive film of a ferromagnetic body is deposited thereon. Further, various magnetoresistive elements to which a novel bias method is applied are provided.
Inventors
- 👤 Noboru Nomura
- 👤 Kenji Kanai
- 👤 Nobuyuki Kaminaka
- 👤 Yuji Omata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:27
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G11B5/39; G11B5/3903; H; H10; H10N; H10N50/00; H10N50/10
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
44 words
A magnetoresistive element comprising a substrate, a magnetoresistive film of a ferromagnetic body formed on said substrate, and at least two electrodes disposed on said magnetoresistive element, wherein a linear grating pattern is unidirectionally formed on at least one surface of said magnetoresistive film.
Claim 2
Dependent Claim
44 words
A magnetoresistive element comprising a substrate, a magnetoresistive film of a ferromagnetic body formed on said substrate, and at least two electrodes disposed on said magnetoresistive element, wherein a linear grating pattern is unidirectionally formed on at least one surface of said magnetoresistive film.
Claim 3
Dependent Claim
17 words
An element according to claim 1, wherein said linear grating pattern has random interval of grating repetition.
Claim 4
Dependent Claim
19 words
An element according to claim 1, wherein said linear grating pattern has a periodic pitch of the grating repetition.
Claim 5
Dependent Claim
26 words
An element according to claim 1, wherein a direction of said linear grating pattern is parallel to the direction of magnetic anisotropy of said magnetoresistive film.
Claim 6
Dependent Claim
28 words
An element according to claim 1, wherein a direction of said linear grating pattern is substantially parallel to the direction of a current flowing through said magnetoresistive film.
Claim 7
Dependent Claim
33 words
An element according to claim 1, wherein a direction of said linear grating pattern is inclined at 30° to 60° with respect to the direction of a current flowing through said magnetoresistive film.
Claim 8
Dependent Claim
32 words
An element according to claim 1, wherein a bias magnetic field is applied to an anisotropic magnetization along said linear grating pattern to set the direction of said magnetization in one direction.
Claim 9
Dependent Claim
72 words
A magnetoresistive element comprising a substrate and a magnetoresistive film of a ferromagnetic body formed on said substrate, wherein a linear grating pattern is unidirectionally formed on a surface facing to said substrate, the direction of said linear grating pattern is inclined by 30° to 60° with respect to the direction of a current flowing through said magnetoresistive film, and the pitch of said grating pattern is not more than 5 μm.
Claim 10
Dependent Claim
72 words
A magnetoresistive element comprising a substrate and a magnetoresistive film of a ferromagnetic body formed on said substrate, wherein a linear grating pattern is unidirectionally formed on a surface facing to said substrate, the direction of said linear grating pattern is inclined by 30° to 60° with respect to the direction of a current flowing through said magnetoresistive film, and the pitch of said grating pattern is not more than 5 μm.
Claim 11
Dependent Claim
60 words
A magnetoresistive element comprising a substrate, and a magnetoresistive film of a ferromagnetic body formed on said substrate, wherein a linear grating pattern is unidirectionally formed on at least one surface of said magnetoresistive film, and the direction of said linear grating pattern is inclined at 45° with respect to the direction of a current flowing through said magnetoresistive film.
Claim 12
Dependent Claim
60 words
A magnetoresistive element comprising a substrate, and a magnetoresistive film of a ferromagnetic body formed on said substrate, wherein a linear grating pattern is unidirectionally formed on at least one surface of said magnetoresistive film, and the direction of said linear grating pattern is inclined at 45° with respect to the direction of a current flowing through said magnetoresistive film.
Claim 13
Dependent Claim
85 words
A magnetoresistive element comprising a substrate, a magnetoresistive film consisting of a pair of magnetoresistive element portions of a ferromagnetic body which are perpendicular to each other and which are formed on said substrate, and a central terminal arranged between said pair of magnetoresistive element portions, wherein linear grating patterns are formed on at least one surface of said pair of magnetoresistive element portions, respectively, and directions of said linear grating patterns are respectively inclined at substantially 45° with respect to said magnetoresistive element porions.
Claim 14
Dependent Claim
85 words
A magnetoresistive element comprising a substrate, a magnetoresistive film consisting of a pair of magnetoresistive element portions of a ferromagnetic body which are perpendicular to each other and which are formed on said substrate, and a central terminal arranged between said pair of magnetoresistive element portions, wherein linear grating patterns are formed on at least one surface of said pair of magnetoresistive element portions, respectively, and directions of said linear grating patterns are respectively inclined at substantially 45° with respect to said magnetoresistive element porions.
Claim 15
Dependent Claim
31 words
An element according to claim 10, wherein said linear grating patterns respectively formed on said at least one surface of each of said magnetoresistive element portions are perpendicular to each other.
Claim 16
Dependent Claim
51 words
A magnetoresistive element comprising: a base member which has a unidirectional linear grating pattern thereon, a magnetoresistive film of a ferromagnetic body formed on said base member, at least two electrodes arranged on said magnetoresistive film, and a magnetic shield layer formed on said magnetoresistive film separated by a magnetic gap.
Claim 17
Dependent Claim
51 words
A magnetoresistive element comprising: a base member which has a unidirectional linear grating pattern thereon, a magnetoresistive film of a ferromagnetic body formed on said base member, at least two electrodes arranged on said magnetoresistive film, and a magnetic shield layer formed on said magnetoresistive film separated by a magnetic gap.
Claim 18
Dependent Claim
25 words
An element according to claim 12, wherein a depth of said linear grating pattern is not more than half a thickness of said magnetic gap.
Claim 19
Dependent Claim
74 words
A magnetoresistive element comprising a magnetic substrate which has a unidirectional linear grating pattern thereon, and a magnetoresistive film of a ferromagnetic body formed on said linear grating pattern through a magnetic gap, wherein the direction of said linear grating pattern is inclined at 30° to 60° with respect to the direction of a current flowing through said magnetoresistive film, and the pitch of said linear grating pattern is not more than 2 μm.
Claim 20
Dependent Claim
74 words
A magnetoresistive element comprising a magnetic substrate which has a unidirectional linear grating pattern thereon, and a magnetoresistive film of a ferromagnetic body formed on said linear grating pattern through a magnetic gap, wherein the direction of said linear grating pattern is inclined at 30° to 60° with respect to the direction of a current flowing through said magnetoresistive film, and the pitch of said linear grating pattern is not more than 2 μm.
Claim 21
Dependent Claim
14 words
An element according to claim 14, wherein said magnetic substrate comprises single crystalline material.
Claim 22
Dependent Claim
70 words
A magnetoresistive element comprising a base member which has a unidirectional linear grating pattern thereon, a magnetoresistive film of a ferromagnetic body formed on said linear grating pattern, and conductive strips which have a small specific resistance and which are arranged on said magnetoresistive film at equal intervals, wherein the direction of said conductive strips is inclined at substantially 45° with respect to the direction of said linear grating pattern.
Claim 23
Dependent Claim
70 words
A magnetoresistive element comprising a base member which has a unidirectional linear grating pattern thereon, a magnetoresistive film of a ferromagnetic body formed on said linear grating pattern, and conductive strips which have a small specific resistance and which are arranged on said magnetoresistive film at equal intervals, wherein the direction of said conductive strips is inclined at substantially 45° with respect to the direction of said linear grating pattern.
Claim 24
Dependent Claim
89 words
A magnetoresistive element comprising a base member which has a unidirectional linear grating pattern thereon, a magnetoresistive film of a ferromagnetic body formed on said base member, a magnetic shield provided with at least one surface of said magnetoresistive film, which is separated by a magnetic gap and conductive strips which have a small specific resistance and which are arranged on said magnetoresistive film at equal intervals, wherein the direction of said conductive strips is inclined at substantially 45° with respect to the direction of said linear grating pattern.
Claim 25
Dependent Claim
89 words
A magnetoresistive element comprising a base member which has a unidirectional linear grating pattern thereon, a magnetoresistive film of a ferromagnetic body formed on said base member, a magnetic shield provided with at least one surface of said magnetoresistive film, which is separated by a magnetic gap and conductive strips which have a small specific resistance and which are arranged on said magnetoresistive film at equal intervals, wherein the direction of said conductive strips is inclined at substantially 45° with respect to the direction of said linear grating pattern.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-16 | 1988-04-16 | 1988-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-16 | 1992-04-16 | 1992-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-16 | 1996-04-16 | 1996-10-16 | $7700.00 | Window Closed / Lapsed |