<title>Recording characteristics of a magneto-optical super-resolution disk</title>

Abstract

ABSTRACT To reduce recording magnetic field of a magneto-optical super-resolution disk which uses an in-plane magnetization readout layer, we developed a new disk structure. By preparing a DyFeCo intermediate layer between the readout layer andthe recording layer, the recording magnetic field was greatly reduced and then both super-resolution readout and mark-edge recording by a magnetic field modulation method were achieved. By using the new triple-layered disk for super-resolution readout, a carrier to noise ratio of 45dB at a 0.4 a m mark length was obtained and the recording magnetic field became 1 5kA/m. 1 . INTRODUCTION In magneto-optical (MO) disks, higher recording density is needed for makingcompact MO driver and handling digitized data of moving pictures. To meet the demand, three types of a magnetically induced super-resolution (MSR) readout method, FAD (front aperture detection), RAD (rear aperture detection)1 and CAD (center aperture detection)2 , were already proposed. Comparing with the FAD method and theRAD method, the CAD method has an advantage that does not need external magneticfield for readout.