Recording characteristics of Dy-FeCo-based magneto-optical disks in comparison to other MO materials

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Abstract
The recording properties of Dy-FeCo-based magnetooptical (MO) disks were investigated for different compositions. The measurements were performed on a laser light and a magnetic field modulation recorder using a 820-nm-wavelength infrared laser. The recording results were analyzed as a function of the Curie and the compensation temperatures, T/sub C/ and T/sub comp/, respectively. The influence of the linear disk velocity on the recording characteristics, such as carrier-to-noise ratio, write/erase power, and domain stability during readout was studied. The results were compared to results for Tb-FeCo and GdTb-Fe single layer and a typical Pt/Co multilayered MO disk. Among the tested disks, Dy-FeCo with T/sub C/=490 K and T/sub comp/=370 K showed the highest write and erase sensitivity (or=55 dB), and the lowest difference between domain stability and erase threshold (>2 mW) up to 22 m/s disk velocity. Pt/Co showed less suitable results as its carrier-to-noise-ratio did not exceed 46 dB for ease field >