US3644908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Domain-propagation arrangement
Assignee: AT&T Inc
•
Filing: 1970-06-29
•
Granted: 1972-02-22
•
Expires: 1990-06-29
Abstract
Abstract An arrangement for moving single-wall domains is described which employs an in-plane magnetic field to incline a domain from alignment with an axis of preferred magnetization of the material in which it is moved. As the in-plane field reorients, the orientation of the inclination changes. The changing domain inclination is converted to domain translation along an axis defined by a magnetic overlay in which a permanent magnetic pattern is printed.
Inventors
- 👤 Andrew Henry Bobeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:34
CPC Classifications
H; H01; H01F; H01F10/00; H01F10/08; H01F10/10; C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2675; G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0808; G11C19/0816
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
105 words
A domain-propagation arrangement comprising a slice of a material in a plane in which single-wall domains can be moved, an overlay adjacent a first surface of said slice and having a coercive force to be only negligibly affected by a magnetic field reorienting in said plane, said slice of material having a sufficiently low anisotropy to permit a change in the inclination of single-wall domains therein with respect to said plane in a manner to follow said reorienting in-plane field, said overlay having a geometry and a magnetic configuration for displacing along a channel in said slice domains the inclination of which are so changed.
Claim 2
Dependent Claim
105 words
A domain-propagation arrangement comprising a slice of a material in a plane in which single-wall domains can be moved, an overlay adjacent a first surface of said slice and having a coercive force to be only negligibly affected by a magnetic field reorienting in said plane, said slice of material having a sufficiently low anisotropy to permit a change in the inclination of single-wall domains therein with respect to said plane in a manner to follow said reorienting in-plane field, said overlay having a geometry and a magnetic configuration for displacing along a channel in said slice domains the inclination of which are so changed.
Claim 3
Dependent Claim
91 words
An arrangement in accordance with claim 1 including said first and a second overlay adjacent first and second surfaces of said slice, each of said overlays comprising spaced apart elements, said elements having permanent magnetization directions to repel said domains in the presence of a reorienting in-plane field, one of said elements in each of said surfaces being of a geometry to constrain an end of domains moving along an axis between said spaced apart elements from an input to an output position, and means for providing a reorienting in-plane field.
Claim 4
Dependent Claim
58 words
An arrangement in accordance with claim 1 wherein said first overlay comprises a continuous overlay film, said film including a magnetic configuration unchanging in the presence of a reorienting in-plane field for constraining a first end of said domain during a first part of each cycle of said in-plane field, and means for providing a reorienting in-plane field.
Claim 5
Dependent Claim
38 words
An arrangement in accordance with claim 3 also including a second continuous overlay film similar to said first overlay for constraining a second end of said domain during a second part of each cycle of said in-plane field.
Claim 6
Dependent Claim
32 words
An arrangement in accordance with claim 1 wherein said first overlay comprises first and second spaced-apart overlay elements having a scalloped and straight edge, respectively, wherein said in-plane field reorients by rotation.
Claim 7
Dependent Claim
45 words
An arrangement in accordance with claim 2 wherein each of said first and second overlays comprises a pair of first and second spaced-apart overlay elements, said first elements having scalloped edges and said second elements having straight edges, wherein said in-plane field reorients by rotation.
Claim 8
Dependent Claim
43 words
An arrangement in accordance with claim 5 wherein said scalloped and straight edges are spaced apart to define a domain-propagation channel therebetween and are magnetized to repel the end of the domain intersecting the surface of the substrate which said overlay elements abut.
Claim 9
Dependent Claim
46 words
An arrangement in accordance with claim 6 wherein said pairs of overlay elements define a domain-propagation channel where the scalloped and straight edges of the elements of each pair are magnetized to repel the ends of domains intersecting the surface which the respective overlay elements abut.
Claim 10
Dependent Claim
56 words
An arrangement in accordance with claim 3 wherein said overlay film includes a pattern of permanent magnetization directions for defining a propagation channel, said pattern having a geometry to define a scalloped path of repelling poles and a straight path of attracting poles for domains along said channel, and wherein said in-plane field reorients by rotation.
Claim 11
Dependent Claim
64 words
An arrangement in accordance with claim 4 wherein each of said overlay films includes a pattern of permanent magnetization directions for defining a domain-propagation channel, said pattern in each of said overlay films having a geometry to define a scalloped path of repelling poles and a straight path of attracting poles for domains along said channel, and wherein said in-plane field reorients by rotation.
Claim 12
Dependent Claim
25 words
An arrangement in accordance with claim 6 wherein said slice comprises a garnet crystal and each of said overlay elements comprises a film of cobalt-copper-samarium.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |