US3991233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing a magnetizable layer for a magnetic domain device
Assignee: US Philips Corp
•
Filing: 1975-04-24
•
Granted: 1976-11-09
•
Expires: 1995-04-24
Abstract
Abstract A method of manufacturing a magnetizable layer having domains with at most two Bloch walls for a magnetic domain device in which a monocrystalline layer of Y 3 -x La x Fe 5 -Y Ga Y O 12 , wherein 0.1 ≦ × ≦ 0.2 and 1.0 ≦ Y ≦ 1.5 is provided on a monocrystalline substrate and is covered with an SiO-containing layer after which the monocrystalline layer is maintained at a temperature between 300° C and 600° C for some time.
Inventors
- 👤 Antonius Gerardus Hendrikus Verhulst
- 👤 Willem Frederik Druyvesteyn
- 👤 Jan Haisma
- 👤 Ulrich Ernst Enz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:38
CPC Classifications
H; H01; H01F; H01F10/00; H01F10/08; H01F10/10; H01F10/18; H01F10/20; H01F10/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
A method of manufacturing a magnetisable layer for a magnetic domain device, comprising the steps of coating a monocrystalline substrate body with a monocrystalline magnetisable layer having a given compensation temperature on one side of a temperature of about 20° C consisting of a ferrite having a garnet structure and having a composition Y 3-x La x Fe 5-y Ga y O 12 wherein 0.1 ≦ x ≦ 0.2 and 1.0 ≦ y ≦ 1.5, thereafter coating the monocrystalline magnetisable layer with an SiO-containing layer and heating said monocrystalline mangetisable layer to a temperature between 300° C and 600° C for a time sufficient to change the compensation temperature of the upper portion of said monocrystalline magnetisable layer to be on the other side of said temperature of about 20° C and magnetic domains in said layer comprise at most two Bloch wall parts.
Claim 2
Independent Claim
144 words
A method of manufacturing a magnetisable layer for a magnetic domain device, comprising the steps of coating a monocrystalline substrate body with a monocrystalline magnetisable layer having a given compensation temperature on one side of a temperature of about 20° C consisting of a ferrite having a garnet structure and having a composition Y 3-x La x Fe 5-y Ga y O 12 wherein 0.1 ≦ x ≦ 0.2 and 1.0 ≦ y ≦ 1.5, thereafter coating the monocrystalline magnetisable layer with an SiO-containing layer and heating said monocrystalline mangetisable layer to a temperature between 300° C and 600° C for a time sufficient to change the compensation temperature of the upper portion of said monocrystalline magnetisable layer to be on the other side of said temperature of about 20° C and magnetic domains in said layer comprise at most two Bloch wall parts.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-11-09 | 1980-05-10 | 1980-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-09 | 1984-05-10 | 1984-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-09 | 1988-05-10 | 1988-11-09 | $7700.00 | Window Closed / Lapsed |