US3988722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single sided, high density bubble domain propagation device
Assignee: International Business Machines Corp
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Filing: 1974-12-31
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Granted: 1976-10-26
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Expires: 1994-12-31
Abstract
Abstract A magnetic bubble domain propagation device which is single sided and can be used to move bubble domains in amorphous magnetic films. The propagation structure is comprised of either one or two layers located on a single side of the amorphous magnetic medium. Preferably, the propagation elements in each layer are contiguous to one another to provide maximum density. In a preferred embodiment, the propagation elements are circular, but other geometries can be used. The amorphous magnetic material is deposited over these underlayer propagation elements in order to create a change in the profile of the amorphous material. This change in profile of the amorphous material acts as a restraining barrier to bubble domain movement, so that the bubble domains will move along the proper channel without drifting to other propagation channels, and will move from one propagation element to the next without merely idling at any of the propagation elements.
Inventors
- 👤 George E. Keefe
- 👤 Mark H. Kryder
- 👤 Yeong S. Lin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:10
CPC Classifications
C; C10; C10M; C10M159/00; C10M159/12; C10M159/20; G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0808; G11C19/0816; H; H01; H01F; H01F10/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
87 words
A structure for moving magnetic bubble domains in an amorphous medium in which such domains exist in response to the reorientations of a magnetic field, comprising: a first magnetic layer located on one side of said amorphous magnetic medium for defining propagation elements, a second magnetic layer located on the same side of said amorphous medium as said first magnetic layer and for defining second propagation elements, the propagation elements in said second magnetic layer being laterally displaced from the propagation elements in said first magnetic layer.
Claim 2
Dependent Claim
87 words
A structure for moving magnetic bubble domains in an amorphous medium in which such domains exist in response to the reorientations of a magnetic field, comprising: a first magnetic layer located on one side of said amorphous magnetic medium for defining propagation elements, a second magnetic layer located on the same side of said amorphous medium as said first magnetic layer and for defining second propagation elements, the propagation elements in said second magnetic layer being laterally displaced from the propagation elements in said first magnetic layer.
Claim 3
Dependent Claim
17 words
The structure of claim 1, where said propagation elements in each layer are contiguous to one another.
Claim 4
Dependent Claim
31 words
The structure of claim 1, where said amorphous film is located over said first and second layers and has a non-uniform smoothness profile determined by the edges of said propagation elements.
Claim 5
Dependent Claim
13 words
The structure of claim 1, where said propagation elements have generally curved shapes.
Claim 6
Dependent Claim
11 words
The structure of claim 4, where said curved shapes are circular.
Claim 7
Dependent Claim
34 words
The structure of claim 1, where said propagation elements in said first layer are defined by apertures in said layer while the propagation elements in said second layer are solid magnetic elements without apertures.
Claim 8
Dependent Claim
67 words
A magnetic bubble domain structure, comprising: a first layer of magnetic material which is patterned to define first propagation elements, a second layer of magnetic material located over said first layer and patterned to define second propagation elements, and an amorphous magnetic material located over said first and second magnetic layers, said amorphous magnetic material having a non-uniform smoothness determined by the edges of said propagation elements.
Claim 9
Dependent Claim
67 words
A magnetic bubble domain structure, comprising: a first layer of magnetic material which is patterned to define first propagation elements, a second layer of magnetic material located over said first layer and patterned to define second propagation elements, and an amorphous magnetic material located over said first and second magnetic layers, said amorphous magnetic material having a non-uniform smoothness determined by the edges of said propagation elements.
Claim 10
Dependent Claim
18 words
The structure of claim 7, where said first propagation elements are laterally displaced from said second propagation elements.
Claim 11
Dependent Claim
21 words
The structure of claim 7, where said first propagation elements are contiguous elements and said second propagation elements are contiguous elements.
Claim 12
Dependent Claim
18 words
The structure of claim 7, where said first layer has apertures therein to define said first propagation elements.
Claim 13
Dependent Claim
18 words
The structure of claim 7, where said second layer has apertures therein to define said second propagation elements.
Claim 14
Dependent Claim
19 words
The structure of claim 7, further including a non-magnetic layer located between said amorphous material and said second layer.
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) | 1979-10-26 | 1980-04-26 | 1980-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-26 | 1984-04-26 | 1984-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-26 | 1988-04-26 | 1988-10-26 | $7700.00 | Window Closed / Lapsed |