EP0166924A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Faceted magneto-optical garnet layer
Assignee: Honeywell International Inc
•
Filing: 1985-05-10
•
Granted: —
•
Expires: 2005-05-10
Abstract
Abstract A magneto-optical element comprises a magnetic garnet layer on a crystalline substrate. The garnet layer has a faceted structure, which provides high Faraday rotation and controlled coercivity. The faceted structure is preferably formed by depositing the layer onto a substrate whose lattice constant is at least about 0.5% smaller than that of the layer. The resulting elements find application in light modulators, such as switches and displays, where they permit high resolution without having to be cut into an array of small cells.
Inventors
- 👤 Devlin Michael Gualtieri
- 👤 Paul Francis Tumelty
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 15:17
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/0009; G02F1/0036; H; H01; H01F; H01F10/00; H01F10/08; H01F10/10; H01F10/18; H01F10/20; H01F10/24; H01F10/245
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
34 words
A magneto-optical element comprising a magnetic garnet layer on a crystalline substrate, characterized in that the lattice constant of the garnet layer exceeds the lattice constant of the substrate by at least about 0.5%.
Claim 2
Dependent Claim
34 words
A magneto-optical element comprising a magnetic garnet layer on a crystalline substrate, characterized in that the lattice constant of the garnet layer exceeds the lattice constant of the substrate by at least about 0.5%.
Claim 3
Dependent Claim
58 words
The element of claim 1 in which the garnet layer has a composition nominally represented by the formula R 3-d (Ca,Sr) d (Fe,Ni,Co,Ga) 5-d (Si,Ge) d O 12 , where R is at least 1 element of the group consisting of Bi,Y, and the elements having atomic number from 57-71, and d is from 0 to about 1.5.
Claim 4
Dependent Claim
18 words
The element of claim 2 in which the garnet is (Bi,Y,Tm,Gd) 3 (Fe,G a ) 5 0 12'
Claim 5
Dependent Claim
19 words
The element of claim 1 in which the garnet layer is on the (111) face of a GGG substrate.
Claim 6
Dependent Claim
26 words
The element of claim 1 in which the lattice constant of the garnet layer exceeds the lattice constant of the substrate by less than about 2%.
Claim 7
Dependent Claim
73 words
A light modulator comprising the magneto-optical element of claim 1 adapted for placement so that a beam of polarized light is incident on, and passes through, the layer, an analyzer adapted for placement so that the beam, after passing through the element, is incident on the analyzer, means for applying a predetermined magnetic field to the layer, and means for adjusting the magnetic field to control the light transmitted by the light modulator.
Claim 8
Dependent Claim
42 words
A process for preparing a magneto-optical element comprising depositing by liquid phase epitaxy a magnetic garnet layer on a crystalline substrate, characterized in that the lattice constant of the garnet exceeds the lattice constant of the substrate by at least about 0.5%.
Claim 9
Dependent Claim
42 words
A process for preparing a magneto-optical element comprising depositing by liquid phase epitaxy a magnetic garnet layer on a crystalline substrate, characterized in that the lattice constant of the garnet exceeds the lattice constant of the substrate by at least about 0.5%.
Claim 10
Dependent Claim
30 words
A process for preparing a magneto-optical element comprising roughening the surface of a crystalline substrate and depositing on the substrate by liquid phase epitaxy a single crystal magnetic garnet layer.
Claim 11
Dependent Claim
30 words
A process for preparing a magneto-optical element comprising roughening the surface of a crystalline substrate and depositing on the substrate by liquid phase epitaxy a single crystal magnetic garnet layer.
Claim 12
Dependent Claim
47 words
A process for preparing a magneto-optical element comprising depositing on a crystalline surface an intermediate crystalline film and depositing on the intermediate film by liquid phase epitaxy a magnetic garnet layer whose lattice constant exceeds the lattice constant of the intermediate film by at least about 0.5%.
Claim 13
Dependent Claim
47 words
A process for preparing a magneto-optical element comprising depositing on a crystalline surface an intermediate crystalline film and depositing on the intermediate film by liquid phase epitaxy a magnetic garnet layer whose lattice constant exceeds the lattice constant of the intermediate film by at least about 0.5%.
Claim 14
Dependent Claim
42 words
A process for preparing a magneto-optical element comprising depositing on a crystalline surface an intermediate crystalline film whose lattice constant exceeds the lattice constant of the substrate by at least about 0.5%, and depositing on the intermediate film a magnetic garnet layer.
Claim 15
Dependent Claim
42 words
A process for preparing a magneto-optical element comprising depositing on a crystalline surface an intermediate crystalline film whose lattice constant exceeds the lattice constant of the substrate by at least about 0.5%, and depositing on the intermediate film a magnetic garnet layer.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.