Patent ID: 6534162
Filing Date: 2003-03-18
Classification: G11B,Y10T

Abstract:
A magneto-optical recording medium comprising at least a reproducing magnetic layer composed at least of Gd and Co showing an in-plane magnetization state at room temperature and a transition to a perpendicular magnetization state at temperatures of not lower than a critical temperature, and a recording magnetic layer formed of a perpendicular magnetization film,said reproducing magnetic layer and said recording magnetic layer being magneto-statically coupled at least in the vicinity of said critical temperature, said reproducing magnetic layer containing at least both of Tb and Dy so as to increase a total magnetization at a temperature at which a perpendicular magnetic anisotropy constant and a diamagnetic field energy are equal to each other, and a non-magnetic intermediate layer provided between the reproducing magnetic layer and the recording magnetic layer, for cutting off the exchange-coupling of the reproducing magnetic layer and the recording magnetic layer, and coupling the reproducing magnetic layer and the recording magnetic layer magneto-statically.