US4624901A
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US
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Intermediary layers for epitaxial hexagonal ferrite films
Assignee: Conexant Systems LLC
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Filing: 1985-04-04
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Granted: 1986-11-25
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Expires: 2005-04-04
Abstract
Abstract A single crystal film of a hexagonal ferrite is deposited on a nonmagnetic, single crystal substrate with a film of a second ferrite material interposed between the substrate and the hexagonal ferrite film. In a preferred embodiment, the substrate is of nonmagnetic spinel and the second ferrite material is a spinel ferrite.
Inventors
- 👤 Howard L. Glass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:14
CPC Classifications
C; C30; C30B; C30B19/00; C30B19/02; B; B82; B82Y; B82Y25/00; C30B29/00; C30B29/10; C30B29/16; C30B29/22; H; H01; H01F; H01F10/00; H01F10/26; H01F10/30; H01F10/32; H01F41/00; H01F41/14; H01F41/24; H01F41/28; Y; Y10; Y10S; Y10S117/00; Y10S117/918
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
61 words
A composition, comprising: a single crystal substrate of a nonmagnetic material lattice matched to a selected hexagonal ferrite; a single crystal film of said selected hexagonal ferrite disposed on said substrate; and a single crystal film of a second ferrite interposed between said substrate and said single crystal film of hexagonal ferrite, wherein said second ferrite is not a hexagonal ferrite.
Claim 2
Dependent Claim
61 words
A composition, comprising: a single crystal substrate of a nonmagnetic material lattice matched to a selected hexagonal ferrite; a single crystal film of said selected hexagonal ferrite disposed on said substrate; and a single crystal film of a second ferrite interposed between said substrate and said single crystal film of hexagonal ferrite, wherein said second ferrite is not a hexagonal ferrite.
Claim 3
Dependent Claim
27 words
The composite of claim 1 wherein said hexagonal ferrite is barium hexaferrite, strontium hexaferrite, lead hexaferrite or a hexaferrite formed by substitutions among barium, strontium and lead.
Claim 4
Dependent Claim
15 words
The composite of claim 1, wherein said substrate is of nonmagnetic spinel or magnesium oxide.
Claim 5
Dependent Claim
42 words
The composite of claim 3 wherein said film of hexagonal ferrite and said film of a second ferrite are on a selected surface of said substrate, and wherein said selected surface is oriented substantially parallel to a (111) plane of said substrate.
Claim 6
Dependent Claim
15 words
The composite of claims 3 or 4 wherein said second ferrite is a spinel ferrite.
Claim 7
Dependent Claim
14 words
The composite of claims 3 or 4 wherein said second ferrite is lithium ferrite.
Claim 8
Dependent Claim
29 words
The composite of claims 3 or 4 wherein said nonmagnetic spinel is magnesium gallium oxide spinel, magnesium indium-gallium oxide spinel, magnesium aluminum oxide spinel or zinc gallium oxide spinel.
Claim 9
Dependent Claim
11 words
The composite of claim 1, wherein said substrate is of beta-alumina.
Claim 10
Dependent Claim
42 words
The composite of claim 8, wherein said film of hexagonal ferrite and said film of a second ferrite are on a selected surface of said substrate, and wherein said selected surface is oriented substantially parallel to a (00.1) plane of said substrate.
Claim 11
Dependent Claim
15 words
The composite of claims 8 or 9 wherein said second ferrite is a spinel ferrite.
Claim 12
Dependent Claim
12 words
The composite of claim 10, wherein said spinel ferrite is lithium ferrite.
Claim 13
Dependent Claim
24 words
The composite of claim 1, wherein said single crystal films of hexagonal ferrite and a second ferrite are formed by liquid phase epitaxial deposition.
Claim 14
Independent Claim
68 words
A method for preparing single crystal films of a selected hexagonal ferrite, comprising: providing a single crystal nonmagnetic substrate lattice matched to said selected hexagonal ferrite; depositing a single crystal film of a second ferrite on said substrate surface; and depositing a single crystal film of said selected hexagonal ferrite on said single crystal film of a second ferrite, wherein said second ferrite is not a hexagonal ferrite.
Claim 15
Independent Claim
68 words
A method for preparing single crystal films of a selected hexagonal ferrite, comprising: providing a single crystal nonmagnetic substrate lattice matched to said selected hexagonal ferrite; depositing a single crystal film of a second ferrite on said substrate surface; and depositing a single crystal film of said selected hexagonal ferrite on said single crystal film of a second ferrite, wherein said second ferrite is not a hexagonal ferrite.
Claim 16
Dependent Claim
24 words
The method of claim 13, further comprising: depositing said single crystal films of hexagonal ferrite and a second ferrite by liquid phase epitaxial deposition.
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) | 1989-11-24 | 1990-05-26 | 1990-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-24 | 1994-05-26 | 1994-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-24 | 1998-05-26 | 1998-11-25 | $7700.00 | Window Closed / Lapsed |