Static information storage and retrieval – Radiant energy – Amorphous
Patent
1987-02-06
1989-06-13
Hecker, Stuart N.
Static information storage and retrieval
Radiant energy
Amorphous
365106, 365215, 365127, 369100, G11C 1300, G11C 1304, G11B 700
Patent
active
048398616
ABSTRACT:
A rewritable information recording medium which has a recording layer containing a Group I transition element and a Group IV representative elements of the Periodic Table as two principal element and a support substrate for physically supporting the recording layer, and an information-write, -read, and erase method using this recording medium. When the recording layer is immediately cooled after it is heated up to near a eutectic temperature of the two principal elements, two metastable phases having different energy levels appear. A state in the first metastable phase of the higher energy level has a reflectivity sufficiently higher than that of a state of a mixed phase including the second metastable phase of the lower energy level, or that of the equilibrium state. The state in the first metastable phase can be obtained by heating a recording layer in another state by light beam irradiation. A portion in the first metastable state is cooled after it is heated to a temperature lower than that for obtaining the first metastable phase, so that it can be converted to a state of the low reflectivity, i.e., a state of a mixed phase including the second metastable phase or to the equilibrium state.
REFERENCES:
patent: 3530441 (1970-09-01), Ovshinsky
patent: 4527173 (1985-07-01), Gupta et al.
J. Chem. Phys., vol. 36, pp. 1870-1874, 1962 by H. L. Lou and W. Klement.
Trans AIME, vol. 242, p. 597, 1968 by B. C. Giessen, U. Wolff and N. J. Grant.
J. Chem. Phys., vol. 39, pp. 1613-1614, 1963 by C. B. Jordan.
Arai Shinji
Ashida Sumio
Ikegawa Sumio
Komatsu Shuichi
Yasuda Nobuaki
Garcia Alfonso
Hecker Stuart N.
Kabushiki Kaisha Toshiba
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