Method for the magnetic field change which depends on the data for magnetic domain enlargement reading and the record carrier for utilizing by the device and the aforementioned method

摘要

This invention regards the method and the device in order to grasp magnetic domain enlargement magneto optic recording medium. Switching time of the external magnetic field it is guided from the reading pulse which is obtained, change period of the aforementioned external magnetic field is set to the value which is longer than channel bit length of memory layer. Because of the fact that, it can decrease the band width request of the coil and the driver circuit, a higher data rate hiding, it makes possible.