Method and device for data dependent field switching for domain expansion reading and record carrier for use by the method

摘要

The present invention relates to a method and an apparatus for reading a domain expansion magneto-optical recording medium. A switching time of an external magnetic field is derived from a reading pulse obtained and the switching period of the external magnetic field is set to a value larger than the channel bit length of a storage layer. Higher data rates are thus allowed due to the fact that the bandwidth requirements of the coils and driver circuits are lowered.