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US 5,667,861 AGranted
Magneto-optical disk
AssigneeBASF SE
InventorsKlaus Harth, Hartmut Hibst
Life of this patent
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Abstract
A magneto-optical disk having at least one optically transparent, dimensionally stable substrate and at least one magneto-optical recording layer of a chromium-containing lanthanide/transition metal alloy, wherein the chromium concentration changes in the horizontal direction, and a process for the producton of the magneto-optical disks.
Claims7
In a magneto-optical disk having a central opening;
- an inner edge;
- an outer edge;
- at least one optically transparent, dimensional stable substrate;
- at least one magneto-optical recording layer consisting of a chromium-containing lanthanide rare earth metal/transition metal alloy, which disk has a radial length extending from the center of the center opening to the outer edge, the improvement comprising the chromium concentration in the magneto-optical recording layer increases continuously radially from the inner edge to the outer edge.
1 more element
Dependencies are inferred from the claim text.