G - Physics – 11 – B
Patent
G - Physics
11
B
G11B 11/10 (2006.01) G11B 11/105 (2006.01)
Patent
CA 2058202
A magneto-optical recording medium which comprises, on a transparent substrate a magneto-optical recording layer having an exchange-interacted, multi-layered structure which consists of a first magnetic film serving as a reproduction layer, a second magnetic film serving as an intermediate layer, and a third magnetic film serving as a record holding layer, these films being magnetically coupled to one another. The Curie points and coercive forces of the respective films are so set that the magnetic pattern formed in the first magnetic film is partially expanded, shrunk or inverted depending on the temperature distribution in a reproduction laser beam spot. Further, the first magnetic film is made of a rare earth element-transition metal amorphous alloy film mainly composed of GdFeCo with a saturation magnetization, Ms, of not greater than 200 emu/cc. The second magnetic film is made of a rare earth element-transition metal amorphous alloy film mainly composed of TbFeCo. In a transition metal sublattice magnetization-rich case, the saturation magnetization, Ms, is not greater than 300 emu/cc and in a rare earth element sublattice magnetization-rich case, the saturation magnetization, Ms, is not greater than 300 emu/cc. Reproduction methods are also described.
Aratani Katsuhisa
Ohta Masumi
Gowling Lafleur Henderson Llp
Sony Corporation
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