US3824568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single wall domain propagation arrangement
Assignee: AT&T Inc
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Filing: 1972-11-24
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Granted: 1974-07-16
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Expires: 1992-11-24
Abstract
Abstract The deposition of an epitaxial layer, in which single wall domains can be moved, on a nonplanar surface of a suitable substrate results in a nonplanar layer in which the domains can be moved in response to a rotating magnetic field in the absence of structured magnetically soft elements. An alternative to the familiar T- and bar-permalloy elements in ''''field access'''' single wall domain devices results.
Inventors
- 👤 R Fischer
- 👤 P Schmidt
- 👤 E Spencer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:12
CPC Classifications
G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0808; G11C19/0816
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
39 words
Apparatus in accordance with claim 1 also including an epitaxial layer formed on said first surface, said layer having a nonplanar geOmetry in accordance with said pattern of features and being capable of having single wall domains moved therein.
Claim 2
Dependent Claim
28 words
Apparatus in accordance with claim 2 wherein said elements are of geometries to move domains thereabout responsive to a magnetic field reorienting in the plane of said layer.
Claim 3
Dependent Claim
13 words
Apparatus in accordance with claim 3 including means for providing said magnetic field.
Claim 4
Dependent Claim
18 words
Apparatus in accordance with claim 3 wherein said elements comprise features from the plane of said first surface.
Claim 5
Dependent Claim
22 words
Apparatus in accordance with claim 3 wherein said elements comprise features recessed into said substrate from the plane of said first surface.
Claim 6
Dependent Claim
27 words
Apparatus in accordance with claim 3 wherein said elements are defined by features both raised and recessed from the plane of said first surface of said substrate.
Claim 7
Dependent Claim
55 words
A magnetic arrangement comprising a layer of material in which single wall domains can be moved, said layer being characterized by an epitaxial layer formed on a nonplanar crystal substrate having a surface in relief in a pattern for defining in said layer a path for moving domains therealong responsive to a reorienting in-plane field.
Claim 8
Independent Claim
46 words
The method of making single wall magnetic domain apparatus comprising the steps of forming a periodic nonplanar pattern of elements in the surface of a single crystal substrate and growing on said resulting nonplanar surface an epitaxial layer capable of having single wall domains moved therein.
Claim 9
Dependent Claim
17 words
The method in accordance with claim 9 wherein said pattern of elements is formed by ion milling.
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) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |