METHOD FOR RECORDING AND ERASING INFORMATION

摘要

The method uses a recording medium comprising a support and a superimposed recording layer composed of Sb, Te, Ge and at least one of Pb, Bi, In, Sn, and Tl. The recording medium is irradiated with a single laser beam, which is applied with two different intensities; one intensity for crystallizing the recording layer of the recording medium and the other intensity for amorphizing the recording layer of the recording medium. 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.