Magneto-optischer Aufzeichungsträger

摘要

A magneto-optical recording medium is composed of first through fourth magnetic layers laminated in this order in such a way that an exchange coupling exists between any adjacent layers of the first through fourth magnetic layers so that a magnetization direction can be copied, wherein the first magnetic layer is a memory layer, the second magnetic layer is a writing layer, the third magnetic layer is a switching layer, and the fourth magnetic layer is an initializing layer. Further, respective Curie temperatures Tci satisfy an inequation Tc3 < Tc1 < Tc2, Tc4 (i = 1, 2, 3, or 4 indicating an ordinal number of the magnetic layers); and the second magnetic layer exhibits an in-plane magnetization at room temperature, whereas, exhibits a perpendicular magnetization above a predetermined temperature set between the room temperature and Tc3 temperature. With this arrangement, after information is recorded on the memory layer based on the magnetization direction, the interface wall energy can be reduced, and the whole magnetic energy can be made substantially equivalent irrespective of the magnetization condition after recording. As a result, a stable recorded condition of the memory layer can be achieved.