MAGNETIC MULTI-VALJUED MAGNETO-OPTICAL DISK

To broaden magneto-optical disk application, the most important issue is a remarkable increase of recording density. This paper firstly opens magnetic multi-valued (MMV) MO disk. Especially, here, quadri-valued MO recording was studied by a field modulation overwriting method using a new layer structured disk. Such attempt gives very attractive approach to make double or more higher capacity disk not depending on laser wavelength.