Transient enhancement of magnetization damping in CoFeB film via pulsed laser excitation
Transient enhancement of magnetization damping in CoFeB film via pulsed laser excitation
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通过脉冲激光激励瞬时增强 CoFeB 薄膜中的磁化阻尼
DOI：
10.1063/1.4959266
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发表时间：
2016-07
影响因子：
4
通讯作者：
Xu Yongbing
中科院分区：
文献类型：
--
作者：
Liu Bo;Ruan Xuezhong;Wu Zhenyao;Tu Hongqing;Du Jun;Wu Jing;Lu Xianyang;He Liang;Zhang Rong;Xu Yongbing
用时间分辨磁光克尔效应测量方法研究了平面磁化CoFeB薄膜的激光诱导自旋动力学。当有效退磁场与泵浦激光注量关系不大时，当抽运注量从2mJ/cm~2增加到20mJ/cm~2时，本征阻尼常数从0.008增加到0.076。这种急剧的增强是暂时的，并归因于泵浦激光激发引起的加热效应，因为当泵浦-探测测量在高功率泵浦脉冲照射后以固定的泵浦注量5mJ/cm~2进行时，衰减常数几乎不变。
Laser-induced spin dynamics of in-plane magnetized CoFeB films has been studied by using time-resolved magneto-optical Kerr effect measurements. While the effective demagnetization field shows little dependence on the pump laser fluence, the intrinsic damping constant has been found to be increased from 0.008 to 0.076 with the increase in the pump fluence from 2 mJ/cm2 to 20 mJ/cm2. This sharp enhancement has been shown to be transient and ascribed to the heating effect induced by the pump laser excitation, as the damping constant is almost unchanged when the pump-probe measurements are performed at a fixed pump fluence of 5 mJ/cm2 after irradiation by high power pump pulses.
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