MAGNETO-OPTICAL FILE MEMORY

摘要

: In a magneto optical file memory, a storage medium having a vertical magnetic film is irradiated with a laser beam to reverse a magnetization direction of the magnetic film, thereby to write and/or erase information. Rotation of a polarizable face of reflected light from the storage medium is detected to reproduce the information. A leakage magnetic field of an actuator that controls an optical system for condensing the laser beam on the storage medium is set to have the same sense as that of the initial magnetization of the magnetic film. The result is a system in which writing, reproduction and erasure can be precisely conducted, and in which use of the leakage field to aid erasure enables the magnet coil used for writing and erasure to be kept small.