Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Patent
1992-06-01
1994-11-01
Dzierzynski, Paul M.
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
369 13, 369110, 369288, 360 59, 428694R, 428900, G11B 726
Patent
active
053612485
ABSTRACT:
A storage medium for use in a magneto-optical information storage medium does not require an initializing magnet. In one embodiment of the medium, a structure includes a memory layer, in which the orientation of magnetic regions perpendicular to the memory layer surface defines the data stored in the memory layer, a reference layer, and an intermediate layer, the intermediate layer mediating an exchange coupling between the memory layer and the reference layer. The combined properties of the storage medium provide a temperature at which, in the presence of a bias magnetic field, data stored in the medium in the form of oriented magnetic domains can be overwritten. In a second embodiment of the invention, a storage medium has two layers, a memory layer and a under layer, of materials with selected magnetic properties. The magnetic properties of the layers are selected to provide magneto-optical storage medium with direct overwriting capability, the operation of the storage medium not requiring an intialization magnet.
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Genova David J.
Hatwar Tukaram K.
Victora Randall H.
Chu Kim-Kwok
Dzierzynski Paul M.
Eastman Kodak Company
Owens Raymond L.
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