Magnetic domain enlargement read-out for the magnetic domain reduction disappearance which is improved

摘要

Borrowing the help of the external magnetic field, method and the device where the magnetic domain is expanded from memory layer of the magneto optic recording medium which includes with memory layer and read-out layer due to heating by the emission beam which possesses radiant power, by copying the mark territory, in the read-out inside layer to read-out layer, controls the read-out processing from magneto optic recording medium. In at least the portion of reduction disappearance period of the external magnetic field, radiant power, 2nd it is applied in the enlargement period of the external magnetic field is higher than level, it is made to increase to 1st level. With that, be able to raise the reduction disappearance speed of the magnetic domain, at the same time, because it is possible, to make the delay decrease which a slower reduction disappearance and the ripple mark which is not ideal the external magnetic field bring it is possible to improve the data rate in the time of read-out.