CA1194233A
Expired / Lapsed
CA
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Magneto-optical modulator
Assignee: Koninklijke Philips NV
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Filing: 1982-09-30
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Granted: 1985-09-24
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Expires: 2002-09-30
Abstract
Abstract ABSTRACT: In a magnetic layer of a magneto-optical modu-lator consisting of magnetic oxides, location-stable magnetic single domain areas are generated in that the areas of the layer present between the single domain areas to be formed are converted by means of reduction. The reduced areas of the layer show an increased elec-trical conductivity and may be used as electric con-ductor paths.
Inventors
- 👤 Heinrich Heitmann
- 👤 Wolfgang Tolksdorf
- 👤 Fritz Welz
- 👤 Klaus Witter
Bibliographic Details
Application Number
—
Jurisdiction
CA
Data Source
google_patents
Last Synchronized
2026-11-06 18:14
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/09; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0858; H; H01; H01F; H01F10/00; H01F10/06
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
58 words
A magneto-optical modulator having a layer of a magnetic material which is provided on a substrate and has an easy axis of magnetization perpendicular to the plane of the layer, said layer comprising a number of magnetic domain areas separated from each other by inter-mediate areas, characterized in that the intermediate areas are at least partly electrically conductive.
Claim 2
Dependent Claim
58 words
A magneto-optical modulator having a layer of a magnetic material which is provided on a substrate and has an easy axis of magnetization perpendicular to the plane of the layer, said layer comprising a number of magnetic domain areas separated from each other by inter-mediate areas, characterized in that the intermediate areas are at least partly electrically conductive.
Claim 3
Dependent Claim
77 words
A magneto-optical modulator as claimed in Claim 1, characterized in that a first and a second system of crossing conductor paths insulated electrically with res-pect to the intermediate areas are provided on the layer, said conductor paths being insulated electrically from each other at the crossings, and that a resistive layer is provided on each domain area and is connected to a conductor path of the first system and to a conductor path of the second system.
Claim 4
Dependent Claim
101 words
A magneto-optical modulator as claimed in Claim 1, characterized in that the electrically conductive parts of the intermediate areas form a first system of electrical conductor paths; that on the surface of the layer a second system of electrical conductor paths is provided, the con-ductor paths of the second system being insulated electri-cally from the conductor paths of the first system and crossing the conductor paths of the first system, and that on each domain area a resistive layer is provided which is connected to a conductor path of the first system and to a conductor path of the second system.
Claim 5
Dependent Claim
91 words
A magneto-optical modulator as claimed in Claim 1, characterized in that the electrically conductive parts of the intermediate areas form a first system of conductor paths and a second system of conductor paths, the conductor paths of the second system being insulated electrically from the conductor path of the first system and crossing the conductor paths of the first system, and that on each domain area a resistive layer is provided which is con-nected to a conductor path of the first system and to a conductor path of the second system.
Claim 6
Dependent Claim
21 words
A magneto-optical modulator as claimed in Claim 1, characterized in that the layer of magnetic material is a ferrimagnetic garnet layer.
Claim 7
Dependent Claim
24 words
A magneto-optical modulator as claimed in Claim 5, characterized in that the garnet layer has a composi-tion (Gd, Bi, Pb)3 (Fe, Al, Ga, Pt)5O12.
Claim 8
Dependent Claim
18 words
A magneto-optical modulator as claimed in Claim 6, characterized in that the garnet layer has the composi-tion Gd2.62Bi0.35Pb0.03Fe4.70Ga0.27Pt0.03O12.
Claim 9
Independent Claim
69 words
A method of manufacturing a magneto-optical modulator in which a layer of a magnetic material having an easy axis of magnetization perpendicular to the plane of the layer is provided on a substrate, after which areas of the layer are converted in such manner that single domain areas separated from each other by intermediate areas are formed, characterized in that the intermediate areas are subjected to a reduction process.
Claim 10
Independent Claim
69 words
A method of manufacturing a magneto-optical modulator in which a layer of a magnetic material having an easy axis of magnetization perpendicular to the plane of the layer is provided on a substrate, after which areas of the layer are converted in such manner that single domain areas separated from each other by intermediate areas are formed, characterized in that the intermediate areas are subjected to a reduction process.
Claim 11
Dependent Claim
32 words
A method as claimed in Claim 8, characterized in that the layer is covered by a mask prior to the reduction process in such manner that the intermediate areas are not covered.
Claim 12
Dependent Claim
19 words
A method as claimed in Claim 9, characterized in that a structured quartz layer is used as a mask.
Claim 13
Dependent Claim
88 words
A method as claimed in Claim 8, characterized in that the whole layer is exposed to at least 106 ions/cm2, ions having such a mass and energy being used that the average depth of penetration is larger than the layer thickness and that etchable core tracks are formed; that the layer is then covered with an etching mask which is structured so that the intermediate areas are not covered; that the core tracks are then etched and that the mask layer is subsequently subjected to the reduction process.
Claim 14
Dependent Claim
20 words
A method as claimed in Claim 11, characterized in that a structured quartz layer is used as an etching mask.
Claim 15
Dependent Claim
31 words
A method as claimed in Claim 11 or 12, charac-terized in that a layer having a layer thickness in the range from more than 2 µm to 30 µm is used.
Claim 16
Dependent Claim
89 words
A method as claimed in Claim 8, characterized in that the layer is covered with a mask in the form of a structured absorbing layer of at least an element having a high atomic weight in such manner that the intermediate areas are not covered; that in the intermediate areas of the layer ions are implanted with such an ion dose that a sufficiently large disturbance of the crystal element is achieved, that the absorbing layer is removed and that the layer is then subjected to the reduction process.
Claim 17
Dependent Claim
38 words
A method as claimed in Claim 14, characterized in that ions are implanted which are accelerated to such an energy that their average depth of penetration is at least 1/5 and at most 4/5 of the layer thickness.
Claim 18
Dependent Claim
16 words
A method as claimed in Claim 14 or 15, charac-terized in that boron ions are implanted.
Claim 19
Dependent Claim
21 words
A method as claimed in Claim 14, characterized in that a layer having a layer thickness below 2 µm is used.
Claim 20
Dependent Claim
26 words
A method as claimed in Claim 14, characterized in that a gold layer structured by means of a photo-etching step is provided as an absorbing layer.
Claim 21
Dependent Claim
35 words
A method as claimed in Claim 18, characterized in that the gold layer is provided in a layer thickness which is larger than the depth of penetration into the absorbing layer of the ions used.
Claim 22
Dependent Claim
39 words
A method as claimed in Claim 8, characterized in that the reduction process is carried out in an atmosphere of 90% N2 + 10% H2 at temperatures in the range from 350 to 600°C for 0.5 to 24 hours.
Claim 23
Dependent Claim
22 words
A method as claimed in Claim 8, characterized in that a part of the reduced areas is subjected to a temper-ing process.
Claim 24
Dependent Claim
24 words
A method as claimed in Claim 21, characterized in that tempering is carried out at a temperature of approximately 900°C for approximately 24 hours.
References Cited (Backward Citations)
No citation records indexed.
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