Probing nonlinear magnetization dynamics in Fe/MgO(001) film by all optical pump-probe technique
Probing nonlinear magnetization dynamics in Fe/MgO(001) film by all optical pump-probe technique
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DOI：
10.1063/1.4871006
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发表时间：
2014-04
影响因子：
4
通讯作者：
Wei He;Boping Hu;Q. Zhan;Xiang-qun Zhang;Zhaohua Cheng
中科院分区：
文献类型：
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作者：
Wei He;Boping Hu;Q. Zhan;Xiang-qun Zhang;Zhaohua Cheng
采用全光泵浦探针技术研究了时域 10 nm Fe/MgO(001) 薄膜的非线性磁化动力学。磁化进动由泵浦激光脉冲激发并由激光注量变化调制。随着激光能量密度增加至 7.1 mJ/cm2，除了均匀进动模式之外，还检测到二次谐波信号。在时频域中获得了二次谐波信号的时间演化。基于Landau-Lifshitz-Gilbert方程，进行数值模拟以再现观察到的Fe/MgO(001)薄膜中的倍频行为。
An all-optical pump-probe technique has been employed to investigate the nonlinear magnetization dynamics of a 10 nm Fe/MgO(001) thin film in time domain. The magnetization precession was excited by pump-laser pulses and modulated by laser fluence variations. With increasing the laser fluence up to 7.1 mJ/cm2, in addition to the uniform precession mode, a second harmonic signal was detected. The time evolution of the second harmonic signal was obtained in time-frequency domain. Based on the Landau-Lifshitz-Gilbert equation, the numerical simulation was performed to reproduce the observed the frequency doubling behaviors in Fe/MgO(001) film.