Patent ID: 7438965

Claim:
A phase-change information recording medium comprising: a substrate, and at least a first protective layer, a phase-change recording layer, a second protective layer, and a reflective layer disposed on the substrate in one of this sequence and reverse sequence, wherein the phase-change recording layer comprises a composition expressed by following Formula 1: Sn α Sb β Ga γ Ge δ Te ε −X ζ [Formula 1] In above Formula 1, X represents at least one element selected from Ag, Zn, In and Cu. α, β, γ, δ, ε and ζ respectively represent composition ratio (atomic percent) of each element and are expressed as follows: 5≦α≦25, 40≦β≦91, 2≦γ≦20, 2≦δ≦20, 0≦ε≦10, 0≦ζ≦10 and α+β+γ+δ+ε+ζ=100.