INFORMATION RECORDING MEDIUM AND RECORDING METHOD

摘要

PURPOSE:To form an information recording medium suitable for high-density recording and high-speed recording particularly in the case of making recording by irradiating recording light to a recording layer and inducing a phase transition from amorphous to crystalline phase in the recording layer of the irradiated part by having the recording layer specified in Te/(Te+Ge) atomic ratio on a substrate. CONSTITUTION:This information recording medium has the recording layer contg. Te and Ge and having 0.2-0.75 Te/(Te+Ge) atomic ratio on the substrate. The temp. at which a change of reflectivity starts according to crystallization is high and large energy is necessary in the stage of recording; in addition, the change of the reflectivity decreases and the recording sensitivity decreases if the Te/(Te+Ge) atomic ratio is <0.2. The phase transition speed from the amorphous to crystalline phase is low and the change of the reflectivity decreases; in addition, the transition temp. decreases and the deteriorated thermal stability of the amorphous state and the deteriorated thermal stability as the information recording medium are caused if the Te/(Te+Ge) atomic ratio exceeds 0.75.