Patent ID: 7485356
Filing Date: 2009-02-03
Classification: G11B

Abstract:
1. An optical recording medium comprising an information layer having a recording film, wherein the recording film is formed of a phase change material which comprises Sb of 79 atomic % to 95 atomic % and Ge of 5 atomic % to 21 atomic % as main components and does not contain the elements in the sixteenth group of the periodic table, wherein the phase change material has an activation energy Ea of 4.0 eV to 6.5 eV, and wherein the phase change material forms a crystal having an axis ratio (c/a) of 2.670 to 2.715 of the “c” axis length with respect to the “a” axis length in a hexagonal lattice when an index as a hexagonal lattice is given to the crystal generated by crystallizing the phase change material.