Light-induced magnetization precession in GaMnAs
Light-induced magnetization precession in GaMnAs
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DOI：
10.1063/1.2903703
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发表时间：
2008-02
影响因子：
4
通讯作者：
E. Rozkotová;P. Němec;P. Horodyska;D. Sprinzl;F. Trojánek;P. Malý;V. Novák;K. Olejník;M. Cukr;T. Jungwirth
中科院分区：
文献类型：
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作者：
E. Rozkotová;P. Němec;P. Horodyska;D. Sprinzl;F. Trojánek;P. Malý;V. Novák;K. Olejník;M. Cukr;T. Jungwirth
本文报道了在没有外加磁场的情况下，飞秒激光脉冲在铁磁（Ga，Mn）As中引起的瞬态极克尔旋转（KR）和瞬态反射率的动力学.结果表明，所测得的KR信号由几个不同的贡献，其中只有振荡信号是直接连接到（Ga，Mn）As中的铁磁序。讨论了光致磁化旋进的起源，发现样品退火强烈影响磁化旋进阻尼（吉尔伯特阻尼）。
We report the dynamics of the transient polar Kerr rotation (KR) and of the transient reflectivity induced by femtosecond laser pulses in ferromagnetic (Ga,Mn)As with no external magnetic field applied. It is shown that the measured KR signal consists of several different contributions, among which only the oscillatory signal is directly connected with the ferromagnetic order in (Ga,Mn)As. The origin of the light-induced magnetization precession is discussed and the magnetization precession damping (Gilbert damping) is found to be strongly influenced by annealing of the sample.