Patent ID: 7173884

Claim:
A magnetooptic recording medium constructed so that an information signal can be recorded and/or reproduced to/from a land and a groove by irradiating a laser beam onto a multilayer magnetic film, in which a light transmitting substrate having a plurality of lands and a plurality of grooves which are alternately formed and a multilayer magnetic film in which a first magnetic layer made of GdFeCo having perpendicular magnetic anisotropy at room temperature, a second magnetic layer made of GdFeCoSi having inplane magnetic anisotropy at room temperature, and a third magnetic layer made of TbFeCo having perpendicular magnetic anisotropy at room temperature are sequentially laminated is provided on a substrate and a content ratio of Co in the third magnetic layer is equal to or larger than 15 atom % and is equal to or less than 17 atom %.