Patent ID: 8426003

Claim:
An information recording medium comprising a substrate and an information layer having a recording layer, on and from which information is recorded and reproduced by irradiation of laser beam, wherein: the recording layer comprises a Te—O-M A -M B material consisting of Te, O, M A , wherein M A is at least one element selected from Au and Pd, and M B , wherein M B is at least one element selected from Ag, Cu and Ni, a content of Te atom is from 10 atom % to 50 atom %, a content of O atom is from 40 atom % to 70 atom %, a content of M A atom is from 3 atom % to 15 atom %, and a content of M B atom is from 3 atom % to 15 atom % in the Te—O-M A -M B material, and a ratio of the content of M B atom to a total of the content of M A atom (X A ) and the content of M B atom (X B )(X B /(X A +X B )) is from 0.25 to 0.75 in the Te—O-M A -M B material.