US4379853A
Expired / Lapsed
US
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Magnetic device having a monocrystalline garnet substrate bearing a magnetic layer
Assignee: US Philips Corp
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Filing: 1980-07-14
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Granted: 1983-04-12
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Expires: 2000-07-14
Abstract
Abstract A magnetic device has a monocrystalline garnet substrate bearing a magnetic layer, in particular for use as information storage. Magmetic device having a monocrystalline substrate bearing a magnetic layer, with the substrate having a composition on the basis of rare earth metal gallium garnet of the general formula ##STR1## wherein A=gadolinium and/or smarium and/or neodym and/or yttrium B=calcium and/or strontium C=magnesium D=zirconium and/or tin and 0<x≦0.7; 0<y≦0.7 and x+y≦0.8.
Inventors
- 👤 Dieter Mateika
- 👤 Rolf Laurien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:30
CPC Classifications
H; H01; H01F; H01F10/00; H01F10/26; H01F10/28; C; C30; C30B; C30B19/00; C30B19/02; C30B19/12; C30B29/00; C30B29/10; C30B29/16; C30B29/22; C30B29/28; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
36 words
A single crystal on the basis of rare earth metal gallium garnet, characterized by the composition ##STR4## wherein A=gadolinium and/or samarium and/or neodym and/or yttrium B=calcium and/or strontium C=magnesium D=zirconium and/or tin and O<×≦0.7;O<y≦0.7 and x+y≦0.8.
Claim 2
Dependent Claim
36 words
A single crystal on the basis of rare earth metal gallium garnet, characterized by the composition ##STR4## wherein A=gadolinium and/or samarium and/or neodym and/or yttrium B=calcium and/or strontium C=magnesium D=zirconium and/or tin and O<×≦0.7;O<y≦0.7 and x+y≦0.8.
Claim 3
Dependent Claim
14 words
A single crystal as claimed in claim 1, characterized in that 0.1≦x,y≦0.4 and 0.5≦x+y≦0.7.
Claim 4
Dependent Claim
37 words
A single crystal as claimed in claims 1 and 2, characterized in that the single crystal has the composition Gd 2 .65 Ca 0 .35 Ga 4 .05 Mg 0 .3 Zr 0 .65 O 12 .
Claim 5
Dependent Claim
37 words
A single crystal as claimed in claims 1 and 2, characterized in that the single crystal has the composition Gd 2 .6 Ca 0 .4 Ga 4 .1 Mg 0 .25 Zr 0 .65 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) | 1986-04-11 | 1986-10-11 | 1987-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-11 | 1990-10-11 | 1991-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-11 | 1994-10-11 | 1995-04-12 | $7700.00 | Window Closed / Lapsed |