Patent ID: 8685518

Claim:
An information recording medium comprising three or more information layers and being capable of recording and reproducing information by light, wherein at least one information layer comprises a recording layer and a nucleation layer; the recording layer comprises a material represented by a following formula (1): [(Ge 0.5 Te 0.5 ) x (In 0.4 Te 0.6 ) 1-x ] y Sb 100-y (mol %)â€ƒâ€ƒ(1) wherein x satisfies 0.8â‰¦x<1.0 and y satisfies 95â‰¦y<100; the nucleation layer comprises a material represented by a following formula (2): (Ge 0.5 Te 0.5 ) z (Bi 0.4 Te 0.6 ) 100-z (mol %)â€ƒâ€ƒ(2) wherein z satisfies 10â‰¦zâ‰¦71; and the nucleation layer is in contact with the recording layer.