Dynamic magnetic information storage or retrieval – Record medium
Patent
1981-02-23
1984-08-21
Hecker, Stuart N.
Dynamic magnetic information storage or retrieval
Record medium
360114, 365 34, 365113, 369275, G11B 1304, G11C 1306
Patent
active
044673833
ABSTRACT:
Disclosed is a new magnetic storage medium including a layer of amorphous material typically GdDyFe whose Curie recording point (e.g. 120.degree. C.) is lower than its crystallization point (e.g. 350.degree. C.) to enable crystallization to cause variations in its optical properties such as transmittance or reflectivity for thermomagnetic writing. Reversible recordings are set up on the amorphous material layer by a thermomagnetic writing technique, for example Curie point writing, while unchangeable or permanent recordings are set up on the amorphous material layer through laser-activated crystallization of the amorphous material layer.
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Deguchi Toshihisa
Ohta Kenji
Takahashi Akira
Hecker Stuart N.
Sharp Kabushiki Kaisha
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