Domain wall mobility measurements in magneto-optic media

Domain wall motion involved in both writing and erasing processes in Magneto-Optic (MO) recording is strongly governed by domain wall mobility. This report extends our previous measurements by a highly sensitive Kerr microscope system of domain wall mobility in MO media to temperature ranges near the Curie temperature (T/sub c/). The velocity of wall motion is measured as a function of the applied field in samples of GdTbFe and GdTbFeCo, with different compositions and compensation temperatures. The experimental temperature ranges from 60/spl deg/C to 10/spl deg/C below T/sub c/. The collected data show that for samples of different composition,the domain wall mobilities increase approximately exponentially as the temperature approaches T/sub c/ from about 0.02 cm/sec-Oe to 5 cm/sec-Oe.<
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