High Linear Density Recording of 0.3 µm Domain Length on Magneto-Optical Disk

Abstract

High linear density magneto-optical recording of 0.3 µm domain length is studied for both laser power modulation and magnetic field modulation methods, through optical observation and numerical simulation of recorded domains on a rotating 5.25 inch TbFeCo disk. In the laser power modulation method, domain length of around 0.3 µm changes largely with fluctuations in recording power. By decreasing the wavelength of the incident laser beam, the amount of change can be reduced. On the other hand, in the magnetic field modulation method, a 0.3 µm domain length can be recorded stably against power deviation even in the case of an 830 nm wavelength at linear velocities of 5∼15 m/sec.