Patent ID: 6403205
Filing Date: 2002-06-11
Classification: G11B,Y10S,Y10T

Abstract:
A magneto-optical medium having plural magnetic layers on a substrate comprising a reproducing layer for reproducing information; a recording layer holding recorded magnetic domains according to the information; and an intermediate layer located between the reproducing layer and the recording layer, said intermediate layer having a Curie temperature lower than the Curie temperature of the reproducing layer and the Curie temperature of the recording layer, the reproducing layer, the intermediate layer and the recording layer are laminated in this order on the substrate and when the magnetic wall energy density, saturation magnetization, magnetic wall coercivity and film thickness of the reproducing layer are defined as &sgr;1, Ms1, Hw1, h1, respectively, and the magnetic wall energy density, saturation magnetization, magnetic wall coercivity and film thickness of the recording layer are defined as &sgr;3, Ms3, Hw3, h3, respectively, and the interface magnetic wall energy density between the reproducing layer and the recording layer is defined as owl 3, at least at room temperature,2Ms1*Hw113/h1 and 2Ms3*Hw3>&sgr;w13/h3are satisfied, wherein the reproducing of the information is carried out by displacing a domain wall of the recorded magnetic domain transferred from the recording layer to the reproducing layer at a region having temperatures not less than the Curie temperature of the intermediate layer to enlarge the transferred magnetic domain to be larger than the recorded magnetic domain in the recording layer; and the Curie temperature of the reproducing layer is lower than that of the recording layer.