Abstract

Magneto-Optical disk possesses very high advantage to record small domain compared to non magnetic optical disk, since MO recording is one kind of magnetic recording. Therefore, very small domain less than 0.1 μm on the MO disk can be recorded stable by using a laser pumped magnetic field modulation. However, the key issue is the readout because it is very small signal. In order to amplify the small signal, a small recorded domain is expanded by using readout magnetic field. This technique is called as Magnetic AMplifying MO System (MAMMOS) and reported that the readout signal of 0.08μm domain was 5 times larger than that of a conventional one, even if a conventional optical pick up of 680nm wavelength laser diode and numerical aperture of 0.55 was used. Thus, from previous papers, it is found that a bit density can be increased by MAMMOS. As a next step, a track density for MAMMOS readout field must be investigated. In this paper, magnetic domain expansion readout for L/G recording is reported by using a conventional optical pick up.

© 1998 Optical Society of America