Patent ID: 6670014
Filing Date: 2003-12-30
Classification: G11B,H01L,Y10T

Abstract:
An information recording medium comprising a first information layer and a 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 first recording layer is made of a first material that comprises Ge, Sb, and Te, the second recording layer is made of a second material that comprises Sb, Te, and at least one element M1 selected from the group consisting of Ag, In, Ge, Sn, Se, Bi, Au and Mn, and the first material is different from the second material.