US4198692A
Expired / Lapsed
US
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Self-biased structure for magnetic bubble domain devices
Assignee: Boeing North American Inc
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Filing: 1978-09-22
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Granted: 1980-04-15
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Expires: 1998-09-22
Abstract
Abstract There is provided a self-biased structure which permits magnetic bubble domain device operation. The invention consists of three layers of material with a bias layer sandwiched between two bubble layers.
Inventors
- 👤 Tsutomu Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:37
CPC Classifications
G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/085
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
35 words
A self-biased structure for magnetic bubble domain devices comprising, first and second layers of magnetic bubble domain materials, and a magnetic biasing layer interposed between said first and second layers of magnetic bubble domain material.
Claim 2
Dependent Claim
35 words
A self-biased structure for magnetic bubble domain devices comprising, first and second layers of magnetic bubble domain materials, and a magnetic biasing layer interposed between said first and second layers of magnetic bubble domain material.
Claim 3
Dependent Claim
17 words
The structure recited in claim 1 wherein all of said layers are magnetized in the same direction.
Claim 4
Dependent Claim
33 words
The structure recited in claim 1 wherein said biasing layer has a high anisotropy and a wall energy which is higher than the wall energy of either of said first and second layers.
Claim 5
Dependent Claim
18 words
The structure recited in claim 2 wherein all of said layers are magnetized perpendicular to the plane thereof.
Claim 6
Dependent Claim
18 words
The structure recited in claim 1 wherein said biasing layer is permanently magnetized perpendicular to the plane thereof.
Claim 7
Dependent Claim
21 words
The structure recited in claim 1 wherein said biasing layer is relatively thin compared to said first and second layers combined.
Claim 8
Dependent Claim
23 words
The structure recited in claim 1 including a further biasing layer disposed over a portion of one of said first and second layers.
Claim 9
Dependent Claim
22 words
The structure recited in claim 1 wherein one of said first and second layers is made thinner to alter the characteristics thereof.
Claim 10
Dependent Claim
13 words
The structure recited in claim 1 including a substrate for supporting said layers.
Claim 11
Dependent Claim
28 words
The structure recited in claim 1 wherein, said first and second layers of magnetic bubble domain materials support bubble domains having a median diameter of about 4 μm.
Claim 12
Dependent Claim
22 words
The structure recited in claim 7 wherein, said further biasing layer comprises an input/output region for interaction with other bubble domain circuits.
Claim 13
Dependent Claim
40 words
The structure recited in claim 1 wherein, said first and second layers exhibit parameters such that single bubble domains in the uppermost of said first and second layers and double bubbles in both said first and second layers can co-exist.
Claim 14
Dependent Claim
32 words
The structure recited in claim 1 wherein, said layers exhibit characteristics such that capping domain walls are formed by bubble domains within the respective bubble domain layer adjacent to said biasing layer.
Claim 15
Dependent Claim
20 words
The structure recited in claim 1 wherein, said first and second layers are constructed of the same type of material.
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) | 1983-04-15 | 1983-10-15 | 1984-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-15 | 1987-10-15 | 1988-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-15 | 1991-10-15 | 1992-04-15 | $7700.00 | Window Closed / Lapsed |