Method of forming permanent memory locations in a magnetooptic m

Details Method of forming permanent memory locations in a magnetooptic m Method of forming permanent memory locations in a magnetooptic m

1984-03-01

1987-06-30

Lesmes, George F.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

365122, 369100, 369121, 369288, 428694, 428900, G11B 7007

Patent

active

046776010

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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patent: 4390600 (1983-06-01), Ohta et al.
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