US3676872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Propagation of magnetic bubble domains
Assignee: Nortel Networks Technology Corp
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Filing: 1971-06-21
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Granted: 1972-07-11
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Expires: 1991-06-21
Abstract
Abstract Propagation of small magnetic bubble domains by larger magnetic bubble domains. Small domains-called bubbles-can be propagated singly or in groups under the control of a larger bubble. Control is easier as conductor patterns can be larger than required for the small bubbles. Also small bubbles of a size which hitherto have proved difficult or impossible to control can be controlled by use of the invention.
Inventors
- 👤 Roger David Lock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:33
CPC Classifications
G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0808; G11C19/0833
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
86 words
A method of propagating magnetic bubble domains in magnetic oxide layers, comprising: forming at least one domain in a first magnetic oxide layer and forming a domain in a second magnetic oxide layer, the two layers in parallel face-to-face relationship, the domain in the second layer larger than the domain in the first layer; moving the larger domain into register with the smaller domain; and moving the larger domain in a predetermined path, the smaller domain moving with and under the control of the larger domain.
Claim 2
Independent Claim
86 words
A method of propagating magnetic bubble domains in magnetic oxide layers, comprising: forming at least one domain in a first magnetic oxide layer and forming a domain in a second magnetic oxide layer, the two layers in parallel face-to-face relationship, the domain in the second layer larger than the domain in the first layer; moving the larger domain into register with the smaller domain; and moving the larger domain in a predetermined path, the smaller domain moving with and under the control of the larger domain.
Claim 3
Dependent Claim
27 words
A method as claimed in claim 1, the larger domain moved under the control of a magnetic film, in a predetermined pattern, associated with said second layer.
Claim 4
Dependent Claim
36 words
A method as claimed in claim 2, wherein a plurality of small domains are formed in the first layer, a large domain in the second layer controlling a number of smaller domains in the first layer.
Claim 5
Dependent Claim
55 words
A method as claimed in claim 1, wherein a plurality of said larger domains are formed in said second layer, and a plurality of said smaller domains are formed in said first layer, each of said larger domains moved in a predetermined path and moving, and controlling the movement of, a plurality of smaller domains.
Claim 6
Dependent Claim
78 words
A magnetic bubble domain device comprising two parallel layers of magnetic oxide, the layers of differing composition in face-to-face relationship, a first layer adApted for the formation of magnetic bubble domains which are smaller than magnetic bubble domains formed in the second layer; means for forming said domains in each of said layers; means for moving a larger domain into registry with at least one smaller domain; and means for moving the larger domains along a predetermined path.
Claim 7
Dependent Claim
78 words
A magnetic bubble domain device comprising two parallel layers of magnetic oxide, the layers of differing composition in face-to-face relationship, a first layer adApted for the formation of magnetic bubble domains which are smaller than magnetic bubble domains formed in the second layer; means for forming said domains in each of said layers; means for moving a larger domain into registry with at least one smaller domain; and means for moving the larger domains along a predetermined path.
Claim 8
Dependent Claim
28 words
A device as claimed in claim 5, said means for moving the larger domains along a predetermined path including a magnetic film pattern associated with said second layer.
Claim 9
Dependent Claim
23 words
A device as claimed in claim 6 said pattern having dimensions compatible with said larger domains and too coarse for said smaller domains.
Claim 10
Dependent Claim
21 words
A device as claimed in claim 5, the layer adapted for the formation of the smaller domains having the composition SmTbFeO3.
Claim 11
Dependent Claim
20 words
A domain as claimed in claim 8, the layer for the formation of the larger domains having the composition YbFeO3.
Claim 12
Dependent Claim
20 words
A domain as claimed in claim 5, the layer adapted for the formation of the smaller domains comprising a garnet.
Claim 13
Dependent Claim
31 words
A device as claimed in claim 5 including means at a localized position in the path of the domains for separately controlling the propagation of the smaller domains at said position.
Claim 14
Dependent Claim
25 words
A device as claimed in claim 5, including means associated with said first layer for providing additional control of the propagation of the smaller domains.
Claim 15
Dependent Claim
37 words
A device as claimed in claim 5 including means for imposing a coding on said smaller domains, at one position in said predetermined path and means for detecting said coding at another position in said predetermined path.
Claim 16
Dependent Claim
39 words
A device as claimed in claim 5 comprising at least three layers of magnetic oxide, all the layers in superimposed parallel face-to-face relationship, and adapted for the formation of domains of differing sizes in immediately adjacent pairs of layers.
References Cited (Backward Citations)
US3503054A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |