US4323618A
Expired / Lapsed
US
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Single crystal of calcium-gallium germanium garnet and substrate manufactured from such a single crystal and having an epitaxially grown bubble domain film
Assignee: US Philips Corp
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Filing: 1978-02-13
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Granted: 1982-04-06
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Expires: 1998-02-13
Abstract
Abstract A novel non-magnetic monocrystalline garnet substrate material in the form of calcium--gallium-germanium garnet. Single crystals of calcium-gallium-germanium garnet can be grown at mush lower temperatures by means of the Czocharalski method than single crystals of the conventional rare earth-gallium garnets. These single crystals are very suitable to epitaxially grow bubble domain films thereon, in particular films on the basis of Lu3Fe5O12.
Inventors
- 👤 Johannes P. M. Damen
- 👤 Johannes A. Pistorius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:58
CPC Classifications
H; H01; H01F; H01F10/00; H01F10/26; H01F10/28; C; C30; C30B; C30B15/00; C30B19/00; C30B19/02; C30B29/00; C30B29/10; C30B29/16; C30B29/22; C30B29/28; C30B29/32; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
18 words
A single crystal of a non-magnetic synthetic garnet material, characterized in that the garnet material is calcium-gallium-germanium garnet.
Claim 2
Dependent Claim
18 words
A single crystal of a non-magnetic synthetic garnet material, characterized in that the garnet material is calcium-gallium-germanium garnet.
Claim 3
Dependent Claim
35 words
A bubble domain device comprising a bubble domain film grown epitaxially on a crystallographic face of a monocrystalline garnet substrate, the substrate material consisting of calcium-gallium-germanium garnet having a melting point of about 1380° C.
Claim 4
Dependent Claim
35 words
A bubble domain device comprising a bubble domain film grown epitaxially on a crystallographic face of a monocrystalline garnet substrate, the substrate material consisting of calcium-gallium-germanium garnet having a melting point of about 1380° C.
Claim 5
Dependent Claim
48 words
A bubble domain device as claimed in claim 2, wherein the substrate material is monocrystalline calcium-gallium-germanium garnet, 22-26% of the number of metal atoms consisting of Ga, 37-39% of the number of metal atoms consisting of Ca, and 37-39% of the number of metal atoms consisting of Ge.
Claim 6
Dependent Claim
38 words
A bubble domain device as claimed in claim 3, wherein the calcium-gallium-germanium garnet material has a lattice constant of approximately 12.25 A, the bubble domain film having a lattice constant which deviates therefrom by at most 0.02 A.
Claim 7
Dependent Claim
28 words
A bubble domain device as claimed in claim 4, wherein the bubble domain film has a composition on the basis of Lu 3 Fe 5 O 12 .
Claim 8
Dependent Claim
45 words
A bubble domain device as claimed in claim 4, wherein the composition of the bubble domain film satisfies the formula (LuA) 3 (FeB) 5 O 12 , in which A=Y, Eu and B=Al, Ga, or A=Ca, Sr, Mg, Si 2+ and B=Ge, Si 4+ .
Claim 9
Dependent Claim
26 words
A bubble domain device as claimed in claim 2 wherein the composition of the calcium-gallium-germanium garnet is Ca 3 Ga 2 Ge 3 O 12 .
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) | 1985-04-05 | 1985-10-05 | 1986-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-05 | 1989-10-05 | 1990-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-05 | 1993-10-05 | 1994-04-06 | $7700.00 | Window Closed / Lapsed |