US3636531A
Expired / Lapsed
US
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Domain propagation arrangement
Assignee: AT&T Inc
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Filing: 1970-06-24
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Granted: 1972-01-18
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Expires: 1990-06-24
Abstract
Abstract A magnetically soft overlay strip defines a multiposition shift register path in a slice of material in which single-wall domains can be moved. The strip also defines a stable location for a single-wall domain to either side thereof for each position in the register. Domains are moved along the path by consecutively offset fields operative simultaneously to both sides of the strip, thus achieving a two-state shift register.
Inventors
- 👤 John Alexander Copeland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:18
CPC Classifications
G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0808; G11C19/0841
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
108 words
A domain propagation arrangement comprising a material in which single-wall domains can be moved, and propagation means for moving a domain from an input to an output position in said material, said propagation means comprising means for providing in a sequence of positions between said input and output positions patterns of magnetic fields for moving domains from position to position in a channel therebetween, and means for defining in each of said positions first and second stable locations for a domain, said last-mentioned means being of a geometry to require movement of domains to like locations of consecutive positions of said channel in response to said magnetic fields.
Claim 2
Dependent Claim
108 words
A domain propagation arrangement comprising a material in which single-wall domains can be moved, and propagation means for moving a domain from an input to an output position in said material, said propagation means comprising means for providing in a sequence of positions between said input and output positions patterns of magnetic fields for moving domains from position to position in a channel therebetween, and means for defining in each of said positions first and second stable locations for a domain, said last-mentioned means being of a geometry to require movement of domains to like locations of consecutive positions of said channel in response to said magnetic fields.
Claim 3
Dependent Claim
41 words
A domain propagation arrangement in accordance with claim 1 wherein said means for defining comprises a permalloy strip extending between said input and output positions having a thickness and width to define said first and second locations to either side thereof.
Claim 4
Dependent Claim
50 words
A domain propagation arrangement in accordance with claim 2 wherein each of said domains has a first magnetization and said strip has a second magnetization where the ratio of the thickness of said strip to the width thereof is less than the ratio of said first to said second magnetization.
Claim 5
Dependent Claim
36 words
A domain propagation arrangement in accordance with claim 3 wherein said permalloy strip is of a geometry such that the internal demagnetizing field therein is smaller than the demagnetizing field of a domain in said material.
Claim 6
Dependent Claim
33 words
A domain propagation arrangement in accordance with claim 2 wherein the width of said strip at said output position is smaller than said width of said strip between said input and output position.
Claim 7
Dependent Claim
33 words
A domain propagation arrangement in accordance with claim 2 wherein the width of said strip at said input position is larger than said width of said strip between said input and output position.
Claim 8
Dependent Claim
33 words
A domain propagation arrangement in accordance with claim 5 wherein the width of said strip at said input position is larger than said width of said strip between said input and output positions.
Claim 9
Dependent Claim
35 words
A domain propagation arrangement in accordance with claim 7 including means for selectively moving domains between first and second stable locations at said input position, and means for selectively detecting domains at said output position.
Claim 10
Dependent Claim
27 words
A domain propagation arrangement in accordance with claim 1 wherein said means for defining comprises a groove in said material extending between said input and output positions.
Claim 11
Dependent Claim
26 words
A domain propagation arrangement in accordaNce with claim 2 wherein the width of said strip is less than the diameter of a domain in said material.
Claim 12
Dependent Claim
24 words
A domain propagation arrangement in accordance with claim 2 wherein the width of said strip equals the radius of a domain in said material.
Claim 13
Dependent Claim
104 words
A domain propagation arrangement comprising a material in which single-wall domains can be moved, and means for moving a domain from an input to an output position in said material, said means comprising a strip of magnetically soft material overlying said material and extending between said input and output positions, said strip having a thickness-to-width ratio for defining first and second stable locations to first and second sides thereof, and means for providing like magnetic fields in a sequence of positions along said strip for simultaneously moving domains in said first or second stable locations of said positions to like locations of consecutive positions.
Claim 14
Dependent Claim
104 words
A domain propagation arrangement comprising a material in which single-wall domains can be moved, and means for moving a domain from an input to an output position in said material, said means comprising a strip of magnetically soft material overlying said material and extending between said input and output positions, said strip having a thickness-to-width ratio for defining first and second stable locations to first and second sides thereof, and means for providing like magnetic fields in a sequence of positions along said strip for simultaneously moving domains in said first or second stable locations of said positions to like locations of consecutive positions.
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) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |