Patent ID: 6743496
Filing Date: 2004-06-01
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, the second recording layer is made of a second material, the first material is different from the second material, in the first and second recording layers, a reversible phase change is caused by the irradiation of the laser beam,the first information layer is disposed closer to a side from which the laser beam is incident than the second information layer, a melting point of the second material is lower than that of the first material, and a thickness of the first recording layer is 9 nm or less.