A magneto-optical recording medium including a base; a readout layer formed on the base; a recording layer formed on the readout layer; and an auxiliary recording layer formed on the recording layer, each of the readout layer, recording layer and auxiliary recording layer being made of...http://www.google.com.au/patents/US5691963?utm_source=gb-gplus-sharePatent US5691963 - Magneto-optical recording device using light-modulated technic without an initial magnetic field 
