Reversible memory structure for optical reading and writing and

Details Reversible memory structure for optical reading and writing and Reversible memory structure for optical reading and writing and

1988-11-09

1990-05-01

Hecker, Stuart N.

Static information storage and retrieval

Radiant energy

Amorphous

365127, 365126, 369100, 369 13, G11C 1304

Patent

active

049224620

ABSTRACT:
In a reversible memory system, a pulsed laser beam generated from a laser unit is directed to a recording layer formed on a substrate 1. The recording layer essentially consists of a recording medium, for example, an iron-nickel alloy containing iron as a major component and 27 to 30 atomic % of nickel, which undergoes martensite transformation from a low-temperature phase to a high-temperature phase at a predetermined temperature Af and which undergoes a stress-induced transformation at a characteristic temperature Md. When a region of the recording layer is irradiated with the laser beam having a predetermined intensity, the region undergoes a stress-induced transformation so that the region is changed from the high temperature phase to the low temperature phase.

REFERENCES:
patent: 3530411 (1970-09-01), Ovshinsky
patent: 4371954 (1983-02-01), Cornet
patent: 4527173 (1985-07-01), Gupta et al.
Larry Kaufman and Morris Cohen, "The Martensitic Transformation in the Iron-Nickel System", Journal of Metals, Oct. 1956.
R. J. Wasilewski, "The Effects of Applied Stress on the Martensitic Transformation in TiNi", Metallurigical Transactions, vol. 2, Nov. 1971.
Patents Abstracts of Japan, vol. 9, No. 190, (P-378) [1913], Aug. 7th, 1985; & JP A-60 57 551, (Nippon Denki K.K.).

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