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We have performed time-resolved magneto-optical Kerr effect measurements with picosecond resolution in a pump-probe experiment using a 30 ps pulsed dye laser (λ=577 nm). Two typical magneto-optical storage materials were investigated: a Gd13Tb12Fe75 amorphous film evaporated on a glass substrate and a Co/Pt multilayer on a Si substrate. Curie-point thermomagnetic writing has been performed in less than 2 ns with the Co/Pt multilayer, whereas with the amorphous film magnetization reversal could not be observed within 6 ns. These differences in switching times are likely the consequence of the different thermal conductivities of the substrates.
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Guarisco et al. (1996) studied this question.
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