Patent ID: 6890613

Claim:
A method for producing an information recording medium comprising a first information layer and a second information layer, the method comprising: (a) forming the first information layer; and (b) forming the second information layer, wherein the first information layer comprises a first recording layer in which a reversible phase change is caused between a crystalline phase and an amorphous phase by irradiation of a laser beam or Joule heat generated by application of current, the second information layer comprises a second recording layer in which a reversible phase change is caused between a crystalline phase and an amorphous phase by the irradiation of the laser beam or the Joule heat generated by the application of the current, the process (a) comprises forming the first recording layer with a base material containing Ge, Sb, and Te, the process (b) comprises forming the second recording layer with a base material containing Sb, Te, and at least one element M1selected from the group consisting of Ag, In, Ge, Sn, Se, Bi, Au and Mn.