US4267230A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film for a magnetic bubble domain device
Assignee: Hitachi Ltd
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Filing: 1979-10-30
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Granted: 1981-05-12
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Expires: 1999-10-30
Abstract
Abstract A garnet film for a magnetic bubble domain device which comprises a predetermined quantity of Gd and a predetermined quantity of Ga. The garnet film has a temperature coefficient of not more than 0.2%/ DEG C. in respect of the bubble collapse field owing to the addition of Gd and Ga and is suitable for substaining small magnetic bubbles of a diameter of less than 2.5 mu m.
Inventors
- 👤 Norio Ohta
- 👤 Fumihiko Ishida
- 👤 Tadashi Ikeda
- 👤 Keikichi Ando
- 👤 Yutaka Sugita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:06
CPC Classifications
H; H01; H01F; H01F10/00; H01F10/08; H01F10/10; H01F10/18; H01F10/20; H01F10/24; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
164 words
A garnet film on a substrate, for a magnetic bubble domain device, said garnet film having a composition Y a Sm b Lu c Gd x Fe 5-y Ga y O 12 , wherein with reference to a single FIGURE in the accompanying drawing, values of x and y lie in a region A surrounded by a line segment a connecting a point 5 (0.90, 0.16) and a point 7 (0.65, 0.85), a line segment b connecting the point 7 (0.65, 0.85) and a point 25 (0.09, 1.14), a line segment c connecting the point 25 (0.09, 1.14) and a point 15 (0.25, 0.48), and a line segment d connecting the point 15 (0.25, 0.48) and the point 5 (0.90, 0.16), a+b+c+x=3, and a is from 0.04 to 1.59, b is from 0.30 to 1.00, and c is from 0.70 to 1.55, said substrate being a Gd 3 Ga 5 O 12 single crystalline substrate, and said garnet film being an epitaxially grown film.
Claim 2
Dependent Claim
164 words
A garnet film on a substrate, for a magnetic bubble domain device, said garnet film having a composition Y a Sm b Lu c Gd x Fe 5-y Ga y O 12 , wherein with reference to a single FIGURE in the accompanying drawing, values of x and y lie in a region A surrounded by a line segment a connecting a point 5 (0.90, 0.16) and a point 7 (0.65, 0.85), a line segment b connecting the point 7 (0.65, 0.85) and a point 25 (0.09, 1.14), a line segment c connecting the point 25 (0.09, 1.14) and a point 15 (0.25, 0.48), and a line segment d connecting the point 15 (0.25, 0.48) and the point 5 (0.90, 0.16), a+b+c+x=3, and a is from 0.04 to 1.59, b is from 0.30 to 1.00, and c is from 0.70 to 1.55, said substrate being a Gd 3 Ga 5 O 12 single crystalline substrate, and said garnet film being an epitaxially grown film.
Claim 3
Dependent Claim
21 words
A garnet film on a substrate according to claim 4 wherein said film has a thickness of 0.2 to 4 μm.
Claim 4
Dependent Claim
21 words
A garnet film on a substrate according to claim 2, wherein said film has a thickness of 0.3 to 1.2 μm.
References Cited (Backward Citations)
US3665427A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-11 | 1984-11-10 | 1985-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-11 | 1988-11-10 | 1989-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-11 | 1992-11-10 | 1993-05-12 | $7700.00 | Window Closed / Lapsed |