Patent ID: 7767285

Claim:
A phase-change optical recording medium, comprising: a recording film that brings about reversible phase-change between a crystalline phase and an amorphous phase upon irradiation with light, the recording film having a composition represented by the general formula: (Ge (1-w) Sn w ) x (Sb (1-v) Bi v ) y Te z , where x+y+z=100, 0≦w<0.5 and 0≦v<1.0; and an interface film formed in contact with at least one surface of the recording film and comprising hafnium (Hf), silicon (Si), oxygen (O) and carbon (C), the interface film being represented by the general formula: HfSi X O Y C Z ; where 0.1≦x≦0.4, 1.8≦y≦4 and 0≦z≦0.5.