Patent US3710356A successfully refreshed from Google Patents.
US3710356A
Expired / Lapsed
US
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Strip domain propagation arrangement
Assignee: AT&T Inc
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Filing: 1971-09-08
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Granted: 1973-01-09
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Expires: 1991-09-08
Abstract
Abstract Single wall domains have been found to be movable in a host magnetic layer in the absence of a bias field and in the absence of sufficient coercivity in the host layer for maintaining the domain walls in fixed positions when drive fields terminate.
Inventors
- 👤 A Bobeck
- 👤 R Fisher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:21
CPC Classifications
G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0808; G11C19/0816
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
99 words
An arrangement comprising a layer of magnetic material in which single wall domains having a first diameter can be moved, a periodic pattern of elements for defining in said layer a multistage propagation channel for moving said domains therealong in response to a magnetic field reorienting in the plane of said layer, a plurality of said elements in each of said stages being spaced apart laterally with respect to one another distances of less than about said first diameter, and means for fixing the position of first and second strip domains adjacent first and second sides of said pattern.
Claim 2
Dependent Claim
99 words
An arrangement comprising a layer of magnetic material in which single wall domains having a first diameter can be moved, a periodic pattern of elements for defining in said layer a multistage propagation channel for moving said domains therealong in response to a magnetic field reorienting in the plane of said layer, a plurality of said elements in each of said stages being spaced apart laterally with respect to one another distances of less than about said first diameter, and means for fixing the position of first and second strip domains adjacent first and second sides of said pattern.
Claim 3
Dependent Claim
29 words
An arrangement in accordance with claim 1 wherein said means for positioning comprises means for providing flux closure paths for strip domains extending along said first and second sides.
Claim 4
Dependent Claim
30 words
An arrangement in accordance with claim 2 wherein said means for positioning comprises first and second sets of magnetically soft elements spaced apart from said first and second sides respectively.
Claim 5
Dependent Claim
34 words
An arrangement in accordance with claim 3 also including means for extending finger domaIns from said first and second strip domains respectively across said pattern of elements at an input one of said stages.
Claim 6
Dependent Claim
26 words
An arrangement in accordance with claim 3 also including means for detecting the presence or absence of a finger domain associated with said first strip domain.
Claim 7
Dependent Claim
18 words
An arrangement in accordance with claim 5 wherein said pattern comprises a repetitive chevron pattern of V-shaped elements.
Claim 8
Dependent Claim
30 words
An arrangement in accordance with claim 6 also including means for providing a magnetic field reorienting in the plane of said layer for moving said finger domains along said pattern.
Claim 9
Dependent Claim
14 words
An arrangement in accordance with claim 7 wherein said magnetic field reorients by rotation.
Claim 10
Dependent Claim
99 words
An arrangement comprising a layer of material in which single wall domains can be moved, a patter of elements for defining in said layer a multistage channel for moving said domains along an axis thereof in response to a magnetic field reorienting in the plane of said layer, a plurality of said elements in each of said stages being closely spaced laterally with respect to one another and of a geometry to move strip domains therealong in response to said field, and means for fixing the position of a strip domain adjacent each side of said pattern of elements.
Claim 11
Dependent Claim
99 words
An arrangement comprising a layer of material in which single wall domains can be moved, a patter of elements for defining in said layer a multistage channel for moving said domains along an axis thereof in response to a magnetic field reorienting in the plane of said layer, a plurality of said elements in each of said stages being closely spaced laterally with respect to one another and of a geometry to move strip domains therealong in response to said field, and means for fixing the position of a strip domain adjacent each side of said pattern of elements.
Claim 12
Dependent Claim
37 words
An arrangement in accordance with claim 9 also including means for extending the domain wall encompassing said strip domain locally into a portion of said layer coupled by said elements at an input one of said stages.
References Cited (Backward Citations)
US3555527A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |