MEHRMALSBESCHREIBBARES OPTISCHES DATENSPEICHERMEDIUM UND VERWENDUNG EINES SOLCHEN MEDIUMS

摘要

A rewritable optical data storage medium ( 20 ) for high-speed recording by means of a focused radiation beam is described. The medium ( 20 ) comprises a substrate ( 7 ) carrying a stack ( 2 ) of layers, which stack ( 2 ) comprises, a substantially transparent first auxiliary layer I 1 ( 3 ), a substantially transparent second auxiliary layer I 2 ( 5 ) having a thickness d_I2, and a recording layer ( 4 ) of a phase-change material having a thickness d_p and comprising at least a composition Ge_xSn_ySb_1-x-y, where 0.05I3 acting as a heat sink is being present at a side of I 2 opposite to the side of the recording layer. The following formula is fulfilled lambda_I2/d_I2>5*10⁸ W m^-2 K^-1, in which formula lambda_I2 is the heat conduction coefficient of the material of the I 2 layer. Thus an optical data storage medium is provided capable of being recorded at a relatively high linear recording speed of about 35 m/s or more.