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The static and dynamic hysteresis loops measured by VSM and polar MO Kerr rotation. The green loop is measured by VSM and the red loop by Kerr rotation. The black loop is the dynamic Kerr loop in sinusoidal AMF.
The pump-fluence dependence of laser-induced ultrafast demagnetization dynamics. The dashed line is the autocorrelation profile of laser pulses. The number near each curve is pump fluence. The solid lines are experimental profiles. The scattered points are the fittings to experimental profiles with a single exponential function.
The pump-fluence dependence of the ultrafast recovering dynamics of laser-induced demagnetization. Solid lines are experimental profiles. The fittings to experimental data by a single exponential function are plotted by the filled points, and give time constants of magnetization recovery vs pump fluences in the inset by the filled squares. The line is a guide to the eye.
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