Information recording medium and method for producing the same, and method for recording/reproducing information thereon

摘要

An information recording medium includes a first information layer 11 and a second information layer 20. The first information layer 11 includes a first recording layer 4 in which a reversible phase change is caused between a crystalline phase and an amorphous phase by irradiation of a laser beam or application of current. The second information layer 20 includes a second recording layer 14 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 application of the current. The first recording layer 4 is made of a first material, the second recording layer 14 is made of a second material, and the first material is different from the second material.