US3607390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single crystal ferrimagnetic films
Assignee: International Business Machines Corp
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Filing: 1969-09-29
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Granted: 1971-09-21
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Expires: 1989-09-29
Abstract
Abstract A process for preparing single crystal ferrimagnetic films having square hysteresis loops, a regulated coercivity, and a compensation temperature above 250* K. A film of gadolinium iron garnet wherein a carefully selected amount of terbium or dysprosium replaces part of the gadolinium is deposited on a tytrium or rare earth aluminum garnet substrate having (111) or (100) orientation and heated until crystallization occurs.
Inventors
- 👤 Richard L Comstock
- 👤 Daniel A Nepela
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:14
CPC Classifications
H; H01; H01F; H01F10/00; H01F10/08; H01F10/10; H01F10/18; H01F10/20; H01F10/24; Y; Y10; Y10S; Y10S117/00; Y10S117/901; Y10S117/902; Y10S117/906
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
35 words
A process as claimed in claim 1 wherein the substrate is yttrium aluminum garnet having (111) orientation and the film has the formula Gd3 xTbxFe5O12 wherein x is within the range from 0.1 to 0.6.
Claim 2
Dependent Claim
35 words
A process as claimed in claim 1 wherein the substrate is yttrium aluminum garnet having (100) orientation and the film has the formula Gd3 xTbxFe5O12 wherein x is within the range from 1 to 2.7.
Claim 3
Dependent Claim
35 words
A process as claimed in claim 1 wherein the substrate is yttrium aluminum garnet having (111) orientation and the film has the formula Gd3 xDyxFe5O12 wherein x is within the range from 0.1 to 1.7.
Claim 4
Dependent Claim
35 words
A process as claimed in claim 1 wherein the substrate is yttrium aluminum garnet having (100) orientation and the film has the formula Gd3 xDyxFe5O12 wherein X is within the range from 0.27 to 1.7.
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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |