Direct Overwriting and Super Resolution Readout by Exchange-Coupled Multilayer Film

Abstract

Abstract-A magneto-optical disk with the functions of direct overwriting by light intensity modulation method and of magnetically induced super resolution readout was realized by utilizing an exchange-coupled multilayer film. Magnetic hysteresis loop measurement clarified that these two functions can work independently at different temperature ranges. Write and read characteristics measurement also proved this and an equivalent CN ratio with that of a disk without direct overwrite function was obtained.