Patent US3792452A successfully refreshed from Google Patents.
US3792452A
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Magnetic devices utilizing ion-implanted magnetic materials
Assignee: AT&T Inc
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Filing: 1971-06-10
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Granted: 1974-02-12
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Expires: 1991-06-10
Abstract
Abstract Magnetic anisotropy in oxidic magnetic materials is altered by strain which is induced by local expansion of the lattice through ion implantation. This compressional strain in the instance of a material having positive magnetostriction may result in an enhanced magnetic easy direction normal to a major surface. Exemplary rare earth iron garnet materials have been so processed as to result in a thin surface region having appropriate magnetic properties for incorporation in ''''bubble'''' devices.
Inventors
- 👤 J North
- 👤 L Varnerin
- 👤 M Dixon
- 👤 R Moline
- 👤 R Wolfe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:05
CPC Classifications
H; H01; H01F; H01F10/00; H01F10/08; H01F10/10; H01F10/18; H01F10/20; C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; H01F10/24; H01F41/00; H01F41/14; H01F41/18; H01F41/186
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
21 words
Process of claim 1 in which the said material evidences a net magnetostriction of approximately at least 1 X 10 6.
Claim 2
Dependent Claim
23 words
Process of claim 2 in which the energy spectrum is such as to result in inhomogeneous ionic absorption in the direction of penetration.
Claim 3
Dependent Claim
27 words
Process of claim 2 in which at least a portion of the said irradiation is in a direction corresponding with the channeling direction for the said material.
Claim 4
Dependent Claim
10 words
Device produced in accordance with the process of claim 2.
Claim 5
Dependent Claim
11 words
Process of claim 2 in which the ionic species is hydrogen.
Claim 6
Dependent Claim
14 words
ProcesS of claim 2 in which the sign of the said magnetostriction is positive.
Claim 7
Dependent Claim
21 words
Process of claim 7 in which the direction of the said positive magnetostriction is approximately orthogonal to the surface being bombarded.
Claim 8
Dependent Claim
12 words
Process of claim 2 in which the said material is essentially homogeneous.
Claim 9
Dependent Claim
16 words
Process of claim 9 in which the said material is a portion of a bulk-grown crystal.
Claim 10
Dependent Claim
16 words
Process of claim 2 in which the said material comprises a layer on a supporting substrate.
Claim 11
Dependent Claim
18 words
Process of claim 11 in which the said layer is crystallographically epitaxial with respect to the said substrate.
Claim 12
Dependent Claim
14 words
Process of claim 12 in which the said layer is produced by liquid-phase epitaxy.
Claim 13
Dependent Claim
15 words
Process of claim 12 in which the said layer is produced by chemical vapor deposition.
Claim 14
Dependent Claim
16 words
Process of claim 12 in which the said layer evidences unique magnetic anisotropy prior to treatment.
Claim 15
Dependent Claim
20 words
Process of claim 2 in which the irradiated surface of the said material is subjected to a variation in dosage.
Claim 16
Dependent Claim
14 words
Process of claim 16 in which the said variation results by use of masking.
Claim 17
Dependent Claim
24 words
Process of claim 16 where such variation results primarily by selective illumination utilizing a beam of cross-section small relative to the surface being irradiated.
Claim 18
Dependent Claim
29 words
Process of claim 16 in which the variation is such as to produce a pattern corresponding with a relatively low coercivity region in which domain wall movement is favored.
Claim 19
Dependent Claim
15 words
Process of claim 2 in which the said magnetic material is of an oxidic composition.
Claim 20
Dependent Claim
17 words
Process of claim 20 in which the said material is a ferrimagnetic material of the garnet structure.
Claim 21
Dependent Claim
17 words
Process of claim 20 in which the said material is a magnetic ferrite of the spinel structure.
References Cited (Backward Citations)
US3643238A
Cited
US3699547A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |