Dynamics of magnetization, reversal, and ultrafast demagnetization of TbFeCo amorphous films
Dynamics of magnetization, reversal, and ultrafast demagnetization of TbFeCo amorphous films
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TbFeCo非晶薄膜的磁化、反转和超快退磁动力学
DOI：
10.1063/1.2943281
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发表时间：
2008-06-09
影响因子：
4
通讯作者：
Lai, Tianshu
中科院分区：
文献类型：
--
作者：
Liu, Xiaodong;Xu, Zhen;Lai, Tianshu
用振动样品磁强计(VSM)和磁光克尔旋转法测量了TbFeCo非晶薄膜的静态和动态磁滞回线。静态VSM环表现出比静态克尔环更快的磁化反转。在1.14 kHz的正弦交变磁场中，动态克尔磁滞回线显示出较大的矫顽力相对于静态矫顽力的增加。用飞秒时间分辨极克尔旋转光谱研究了激光诱导退磁和磁化恢复的超快动力学，发现了一个亚皮秒退磁和几百皮秒磁化恢复的过程，这表明千兆赫的写入速率是可能的。
Static and dynamic hysteresis loops of TbFeCo amorphous films are measured by vibrating sample magnetometry (VSM) and magneto-optical Kerr rotation. The static VSM loop shows a faster magnetization reversal than the static Kerr loop does. The dynamic Kerr hysteresis loop in a sinusoidal alternating magnetic field at 1.14kHz shows a large increase in coercivity with respect to the static coercivity. The ultrafast dynamics of laser-induced demagnetization and magnetization recovery is studied by femtosecond time-resolved polar Kerr rotation spectroscopy, and shows a subpicosecond demagnetization and several hundreds of picosecond magnetization recovery process, which suggests gigahertz writing rate possible.