Patent ID: 7947353
Filing Date: 2011-05-24
Classification: G11B,Y10T

Abstract:
1. An information recording medium comprising at least two information layers each having a recording layer which can generate optically detectable phase-change, wherein one information layer near a light incoming side is referred to as an information layer a, and the other information layer distant from the light incoming side as an information layer b, wherein: said information layer a comprises, at least, a dielectric layer said dielectric layers each of said dielectric layer each of said dielectric layers a composition of said dielectric layer each of said recording layers a and b comprises a Ge—Bi—Te—M″-based material represented by the following formula (11): wherein M″ represents at least one element selected from Al, Ga and In; and a, b and d satisfy the relationships of 25 ≦a ≦60, 0 <b ≦18, 35≦d ≦55, and 82 ≦a+b+d <100.