Asahi Kasei Kogyo K.k.

Masanobu Sato

Isao Morimoto

Kouichi Mori

A method for recording and erasing information by irradiating a specific recording medium with a single laser beam, which is applied with two different intensities respectively for crystallizing a recording layer of the recording medium and for amorphizing a recording layer of the recording medium. According to the present invention, both the recording of information and the erasing of information can be simply performed using a single laser beam by changing only its intensity between the two different laser beam intensities according to a laser beam intensity pattern corresponding to predetermined information. The recording material comprises Sb, Te, Ge and at least one element selected from the group consisting of Pb, Bi, In, Sn and Tl.

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Fuji, Japan

Masanobu Sato