Information recording medium

Details Information recording medium Information recording medium

1994-08-17

1996-12-03

Ryan, Patrick

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428 642, 428 644, 428 645, 428 646, 428913, 4302701, 43027011, 43027012, 43027013, 430945, 430524, 3692752, 369283, 369288, B32B 300

Patent

active

055806325

ABSTRACT:
The present invention provides an information recording medium including a first recording film formed on a substrate and having an amorphous phase made of an alloy containing at least Ge and Te, and a second recording film formed on the first recording film and made of a material with a relatively large light absorption coefficient, wherein the alloy of the first recording film exhibits a Raman scattering spectrum having scattering peaks at 140 to 160 cm.sup.-1 and 120 to 130 cm.sup.-1 and no scattering peaks at 100 to 110 cm.sup.-1, and recording is performed by changing optical characteristics by alloying the materials of the first and second recording films by radiating recording light on the first and second recording films. The present invention provides an information recording medium including a recording film formed on a substrate and having an amorphous phase made of an alloy containing Ge, Sb, and Te, wherein the amorphous phase of the recording film is a mixed phase containing cluster molecules containing of two elements, Ge--Te and/or Sb--Te, and recording is performed by changing optical characteristics by changing in phase the cluster molecules into corresponding crystalline GeTe and crystalline SbTe by radiating recording light on the recording film.

REFERENCES:
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patent: 5289453 (1994-02-01), Ohno et al.
patent: 5348783 (1994-09-01), Ohno
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G. B. Fischer, J. Tanc, and Y. Verhelle, Proceedings of the Fifth International Conference on Amorphous and Liquid Semiconductors, "Vibrational modes and bonding in the amorphous Ge.sub.X Te.sub.1-X ", (Taylor and Francis Ltd., London, 1977) p. 1259.
"Extended Abstracts ( The 54th Autumn Meeting, 1993); The Japan Society of Applied Physics".
"Extended Abstracts (The 37th Spring Meeting, 1990); The Japan Society of Applied Physics and Related Societies".
"Structural Changes of Amorphous GeTe.sub.2 Films by Annealing (Formation of Metastable Crystalline GeTe.sub.2 Films)", Fukumoto, et al., Journal of the Physical Society of Japan, vol. 56, pp. 158-162, Jan. 1987.
"A Raman and Far-Infrared Investigation of Phonons in the Rhombohedral V.sub.2 -VI.sub.3 Compounds", Richter, et al., physica status solidi (b) basic research, vol. 84, No. 2, pp. 407-824, Dec. 1, 1977.
"The Raman Spectrum of Amorphous Tellurium", Brodsky, et al., physica status solidi (b) basic research, vol. 52, No. 2, pp. 347-714, Aug. 1, 1972.

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