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Ultrafast spin dynamics in Tb (FeCo) films is studied using the time-resolved magneto-optical Kerr effect. At pump fluence of 1.0 mJ/cm the ultrafast demagnetization processes are accomplished by one-step and two-step decays (the first fast and second slow decays) for low and high Tb contents, respectively. For the low Tb contents , the demagnetization time is almost a constant...
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