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US4265980A
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Technique for the growth of magnetic garnet compositions
Assignee: AT&T Inc
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Filing: 1977-12-30
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Granted: 1981-05-05
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Expires: 1997-12-30
Abstract
Abstract Magnetic garnet compositions grown from a novel flux comprising a mixture of Li2MoO4 and R2(MoO4)3 wherein R represents yttrium or a rare earth element having an atomic number from 62 to 71 have appropriate magnetic properties for use in bubble domain devices. Items produced are uniform in composition and may be of submicron thickness.
Inventors
- 👤 William A. Bonner
- 👤 LeGrand G. Van Uitert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:06
CPC Classifications
C; C30; C30B; C30B19/00; C30B19/02; C30B29/00; C30B29/10; C30B29/16; C30B29/22; C30B29/28; Y; Y10; Y10S; Y10S117/00; Y10S117/901; Y10S117/902; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
131 words
Method for the epitaxial growth of a first composition of the garnet structure upon a surface of a second composition of the garnet structure by crystallization from a growth solution comprising a nutrient and a flux, the first and second compositions having lattice parameters, a o , differing by a maximum of about 0.5 percent, which comprises the steps of (a) immersing a substrate of said second composition of the garnet structure in said growth solution containing lithium molybdate, Li 2 MoO 4 , and a molybdate of the formula R 2 (MoO 4 ) 3 wherein R represents yttrium, a rare earth element ranging in atomic number from 62 to 71 or mixtures thereof, and (b) removing the substrate from the melt and permitting it to cool to room temperature.
Claim 2
Dependent Claim
131 words
Method for the epitaxial growth of a first composition of the garnet structure upon a surface of a second composition of the garnet structure by crystallization from a growth solution comprising a nutrient and a flux, the first and second compositions having lattice parameters, a o , differing by a maximum of about 0.5 percent, which comprises the steps of (a) immersing a substrate of said second composition of the garnet structure in said growth solution containing lithium molybdate, Li 2 MoO 4 , and a molybdate of the formula R 2 (MoO 4 ) 3 wherein R represents yttrium, a rare earth element ranging in atomic number from 62 to 71 or mixtures thereof, and (b) removing the substrate from the melt and permitting it to cool to room temperature.
Claim 3
Dependent Claim
27 words
Method in accordance with claim 1 wherein the flux comprises from 20 to 50 mole percent of R 2 (MoO 4 ) 3 , remainder lithium molybdate.
Claim 4
Dependent Claim
62 words
Method in accordance with claim 1 wherein said first composition of the garnet structure is of the formula Me.sub.3 M.sub.5 O.sub.12 wherein O is oxygen, M is a trivalent metal selected from the group consisting of trivalent iron, gallium, aluminum and mixtures thereof and Me is yttrium, a rare earth element ranging in atomic number from 62 to 71 or mixtures thereof.
Claim 5
Dependent Claim
17 words
Method of claim 1 wherein the crystallographic surface of the said second composition is of (111) orientation.
Claim 6
Dependent Claim
17 words
Method of claim 1 wherein the crystallographic surface of the said second composition is of (100) orientation.
Claim 7
Dependent Claim
26 words
Method in accordance with claim 1 wherein growth of said first composition proceeds from said growth solution at a temperature within the range of 800°-1100° C.
Claim 8
Dependent Claim
28 words
Method in accordance with claim 1 wherein growth is effected over a time period ranging from 1-24 hours at a rate within the range of 0.05 μm/min.-0.25 μm/min.
Claim 9
Dependent Claim
18 words
Method in accordance with claim 1 wherein said flux comprises a mixture of yttrium molybdate and lithium molybdate.
Claim 10
Dependent Claim
22 words
Method in accordance with claim 1 wherein said flux comprises yttrium molybdate, a rare earth molybdate or mixtures thereof and lithium molybdate.
Claim 11
Dependent Claim
23 words
Method in accordance with claim 8 wherein said nutrient comprises yttrium oxide and iron oxide and said first composition is yttrium iron garnet.
Claim 12
Dependent Claim
35 words
Method in accordance with claim 8 wherein said nutrient comprises yttrium oxide, a rare earth oxide or mixtures thereof, iron oxide and gallium oxide and said first composition is yttrium rare earth gallium iron garnet.
Claim 13
Dependent Claim
10 words
Product produced in accordance with the method of claim 1.
Claim 14
Dependent Claim
58 words
Flux composition for the growth of synthetic garnet comprising a mixture of lithium molybdate, Li 2 MoO 4 and a molybdate of the formula R 2 (MoO 4 ) 3 wherein R represents yttrium or a rare earth element ranging in atomic number from 20-50 mole percent of R 2 (MoO 4 ) 3 , remainder lithium molybdate.
Claim 15
Dependent Claim
58 words
Flux composition for the growth of synthetic garnet comprising a mixture of lithium molybdate, Li 2 MoO 4 and a molybdate of the formula R 2 (MoO 4 ) 3 wherein R represents yttrium or a rare earth element ranging in atomic number from 20-50 mole percent of R 2 (MoO 4 ) 3 , remainder lithium molybdate.
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) | 1984-05-04 | 1984-11-03 | 1985-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-04 | 1988-11-03 | 1989-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-04 | 1992-11-03 | 1993-05-05 | $7700.00 | Window Closed / Lapsed |