Patent ID: 6794006
Filing Date: 2004-09-21
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, wherein the first material comprises Ge, Sb, and Te, the second material comprises Sb and at least one element Ml selected from the group consisting of Ag, In, Ge, Sn, Se, Bi, Au, Mn and Te, the first information layer is disposed closer to a side from which the laser beam is incident than the second information layer, and wherein a separating layer is provided to distinguish the first recording layer and the second recording layer, the thickness of the separating layer is in the range of 1 &mgr;m to 50 &mgr;m.