Magneto-Optical Disk Structure with High Write/Erase Repeatability

Abstract

Over 10 7 write/erase repeatability has been achieved in magneto-optical (MO) disk by optimizing thermo-structural design through thermal conduction analyses. By combining this technology with that for anti-corrosion measures, a highly reliable and durable 5 1/4 inch MO disk has been developed. Carrier level degradation through write/erase repetition, which was observed in the cource of the development, is thought to be interpreted as a structure relaxation by annealing leading to a localized change in magnetic properties.