MAGNETIC AND MAGNETOOPTICAL PROPERTIES OF RE-TM ERASABLE OPTICAL DISK

The experimental results of magneto-optical storage media for practical disk application are summarized. The oxidation behaviour of the thin films, and its influence on magnetic and magneto-optical properties are studied. The optimum design of the practical disk with multistructure for obtaining the ratio of the optimum read out signal to noise and the optimum read out laser power are presented. Moreover, the calculation of the instantaneous temperature distribution in the medium by thermal writing is given. The TbFeCo disk with quadrilayer structure on PC substrate was prepared, with S/N = 51.2 dB at 3.7 MHz and it can be used for practical application with computer.