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Femtosecond Demagnetization And Hot-hole Relaxation In Ferromagnetic Ga_(1-x)mn_xas

机译:铁磁Ga_(1-x)mn_xas中的飞秒退磁和热孔弛豫

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We have studied ultrafast photoinduced demagnetization in GaMnAs via two-color time-resolved magneto-optical Kerr spectroscopy. Below band gap midinfrared pump pulses strongly excite the valence band, while near-infrared probe pulses reveal subpicosecond demagnetization that is followed by an ultrafast (~1 ps) partial recovery of the Kerr signal. Through comparison with InMnAs, we attribute the signal recovery to an ultrafast energy relaxation of holes. We propose that the dynamical polarization of holes through p-d scattering is the source of the observed probe signal. These results support the physical picture of femtosecond demagnetization proposed earlier for InMnAs, identifying the critical roles of both energy and spin relaxation of hot holes.
机译:我们已经通过两种颜色的时间分辨磁光Kerr光谱研究了GaMnAs中的超快光致退磁。在带隙以下,中红外泵浦脉冲强烈激发价带,而近红外探测脉冲显示亚皮秒消磁,随后Kerr信号超快(〜1 ps)部分恢复。通过与InMnAs的比较,我们将信号恢复归因于空穴的超快能量弛豫。我们提出,通过p-d散射对空穴进行动态极化是观察到的探针信号的来源。这些结果支持了先前针对InMnAs提出的飞秒退磁的物理图像,确定了热空穴的能量和自旋弛豫的关键作用。

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