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US4429052A
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Magnetic hexagonal ferrite layer on a nonmagnetic hexagonal mixed crystal substrate
Assignee: US Philips Corp
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Filing: 1982-07-06
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Granted: 1984-01-31
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Expires: 2002-07-06
Abstract
Abstract With the fabrication of a substrate material in the form of alkaline-earth gallate single crystals it has become possible to grow monocrystalline barium hexaferrite layers of high quality. These thin barium hexaferrite layers on the alkaline-earth gallate substrates are extremely suited as magnetic devices because of their very high uniaxial anisotropy and their small line width. Such magnetic devices can be used for passive microwave components, e.g. as resonance isolators or filters in the centimeter wavelength range or as components in information storage technology, e.g. in magnetic cylindrical domain devices, especially in the field of very small (submicron) cylindrical domains.
Inventors
- 👤 Dieter W. Mateika
- 👤 Gunter Bartels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:16
CPC Classifications
C; C30; C30B; C30B29/00; C30B29/10; C30B29/16; C30B29/22; C30B15/00; H; H01; H01F; H01F10/00; H01F10/08; H01F10/10; H01F10/18; H01F10/20; H01F10/205; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10S977/00; Y10S977/70; Y10S977/832; Y10S977/838; Y10S977/84; Y10S977/89; Y10S977/902; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
78 words
A crystalline material consisting essentially of a hexagonal alkaline-earth gallate mixed crystal with a formula A.sub.1+y.sup.2+ Ga.sub.12-2x-y B.sub.x.sup.2+ C.sub.x.sup.4+ O.sub.19, where A is one or more elements selected from the group consisting of barium and strontium, B is one or more elements selected from the group consisting of magnesium, manganese, zinc, iron, copper, nickel, cobalt, and chromium, C is one or more elements selected from the group consisting of zirconium, hafnium, titanium, and tin, and 0.1≦x≦1.2 and 0≦y≦0.8.
Claim 2
Dependent Claim
78 words
A crystalline material consisting essentially of a hexagonal alkaline-earth gallate mixed crystal with a formula A.sub.1+y.sup.2+ Ga.sub.12-2x-y B.sub.x.sup.2+ C.sub.x.sup.4+ O.sub.19, where A is one or more elements selected from the group consisting of barium and strontium, B is one or more elements selected from the group consisting of magnesium, manganese, zinc, iron, copper, nickel, cobalt, and chromium, C is one or more elements selected from the group consisting of zirconium, hafnium, titanium, and tin, and 0.1≦x≦1.2 and 0≦y≦0.8.
Claim 3
Dependent Claim
17 words
A crystalline material as claimed in claim 1, CHARACTERIZED IN THAT the crystal is a single crystal.
Claim 4
Dependent Claim
12 words
A crystalline material as claimed in claim 2, CHARACTERIZED IN THAT 0.4≦x≦0.8.
Claim 5
Dependent Claim
21 words
A crystalline material as claimed in claim 3, CHARACTERIZED IN THAT the crystal has the formula Sr.sub.1.03 Ga.sub.10.99 Mg.sub.0.49 Zr.sub.0.49 O.sub.18.99.
Claim 6
Dependent Claim
21 words
A crystalline material as claimed in claim 3, CHARACTERIZED IN THAT the crystal has the formula Sr.sub.1.0 Ga.sub.10.38 Zn.sub.0.81 Zr.sub.0.81 O.sub.19.
References Cited (Backward Citations)
US4323618A
Cited
US4379853A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1987-01-30 | 1987-08-01 | 1988-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-30 | 1991-08-01 | 1992-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-30 | 1995-08-01 | 1996-01-31 | $7700.00 | Window Closed / Lapsed |