| 摘要 |
<p>A method for recording, reproducing and erasing information by using a recording thin film of a crystalline-amorphous phase-transition type. By modulation of the output power of a single laser to three different levels, it is possible to record, reproduce, erase or directly overwrite (erase and re-record in one pass) with the same beam. The method is not limited to a light beam, but may also use another energetic beam such as an electron beam or ion beam. A thin film applicable to the above method is characterised by the following composition: Ax By Cz D alpha where 0 </= x < 30, preferably 0 </= x </= 20 5 </= y </= 40 15 </= z </= 70 30 </= alpha </= 80 and D is Se and/or S; C is Sn, As, Sb, Ge, Ga and/or In, preferably Sn or In; B is Bi, Pb, Zn, Cd and/or Al; A is an element other than B, C or D. The method described is not limited by the use of the claimed thin film recording medium, but may be used with other media. The claimed medium is not limited to the claimed method of recording, but may be used with other recording methods.</p> |
