改进的时间分辨磁光克尔效应技术及垂直磁化$L1_{\mathrm{0}}$ FePt薄膜的动态磁化反转机制
Improved time-resolved magneto-optical Kerr effect technique and dynamic magnetization reversal mechanism of perpendicularly magnetized $L1_{\mathrm{0}}$ FePt films
摘要：
传统的时间分辨磁光克尔效应技术不能精确测量动态磁化率，因为瞬态磁化强度的不可逆偏移会累积。为了消除积累效应，采用了与飞秒激光脉冲同步的交变磁场。由于样品在每个单个激光脉冲之前复位，因此消除了瞬态磁化的不可逆偏差的累积效应。对于垂直磁化的$L1_{\mathrm{0}}$ FePt薄膜，动态磁化反转过程是通过反转畴的成核和钉扎畴壁的运动来完成的。
英文摘要：
The dynamic coercivity cannot be measured rigorously by the conventional time-resolved magneto-optical Kerr effect technique because the irreversible deviation of the transient magnetization is accumulated. In order to remove the accumulation effect, the alternating magnetic field is employed and synchronized with the femtosecond laser pulse. Since the sample is reset before each single laser pulse, the accumulation effect of the irreversible deviation of the transient magnetization is removed. For perpendicularly magnetized $L1_{\mathrm{0}}$ FePt films, the dynamic magnetization reversal process is accomplished by the nucleation of reversed domains and the pinned domain wall motion.
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