Over-write capable magnetooptical recording method with widened power margin, and magnetooptical recording apparatus used in this method

摘要

An over-write capable magnetooptical recording method of this invention includes the steps of: preparing an "over-write capable multi- layered magnetooptical recording medium, which consists of at least two layers including a memory layer and a writing layer, and in which the memory layer and the writing layers are exchange-coupled to each other, the direction of magnetization of the writing layer can be aligned in a predetermined direction at room temperature without changing the direction of magnetization of the memory layer, and the direction of the magnetization of the writing layer is already aligned in the predetermined direction"; rotating the medium; irradiating a laser beam onto the medium; pulse-modulating the intensity of the laser beam between a high level P.sub.H and a low level P.sub.L according to binary coded information to be recorded; and applying a bias field to the irradiation position of the laser beam. After mark formation based on the beam at the high level P.sub.H is started, the level is slightly decreased to continue the mark formation. An apparatus for embodying this method is also disclosed.