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首页> 外文期刊>Japanese journal of applied physics >Fluence-dependent dynamics of the 5d6s exchange splitting in Gd metal after femtosecond laser excitation
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Fluence-dependent dynamics of the 5d6s exchange splitting in Gd metal after femtosecond laser excitation

机译：飞秒激光激发后G金属中5d6s交换分裂的依赖注量动力学

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摘要

We investigate the fluence-dependent dynamics of the exchange-split 5d6s valence bands of Gd metal after femtosecond, near-infrared (IR) laser excitation. Time-and angle-resolved photoelectron spectroscopy (tr-ARPES) with extreme ultraviolet (XUV) probe pulses is used to simultaneously map the transient binding energies of the minority and majority spin valence bands. The decay constant of the exchange splitting increases with fluence. This reflects the slower response of the occupied majority-spin component, which we attribute to Elliot-Yafet spin-flip scattering in accordance with the microscopic three-temperature model (M3TM). In contrast, the time constant of the partly unoccupied minority-spin band stays unaffected by a change in pump fluence. Here, we introduce as an alternative to superdiffusive spin transport exchange scattering, which is an ultrafast electronic mechanism explaining the observed dynamics. Exchange scattering can reduce the spin polarization in the partially unoccupied minority-spin band and thus its energetic position without effective demagnetization. (C) 2016 The Japan Society of Applied Physics
机译：我们研究飞秒，近红外（IR）激光激发后Gd金属的交换分裂5d6s价带的依赖于注量的动力学。具有极紫外（XUV）探测脉冲的时间和角度分辨光电子能谱（tr-ARPES）用于同时绘制少数和多数自旋价带的瞬态结合能。交换分裂的衰减常数随注量而增加。这反映了所占多数自旋分量的响应较慢，这归因于根据微观三温度模型（M3TM）的Elliot-Yafet自旋翻转散射。相反，部分未被占用的少数自旋带的时间常数不受泵注量变化的影响。在这里，我们介绍超扩散自旋输运交换散射的替代方法，它是解释观察到的动力学的超快电子机制。交换散射可以减小部分未占据的少数自旋带中的自旋极化，从而降低其能量位置，而无需有效地消磁。 （C）2016年日本应用物理学会

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  • 来源
    《Japanese journal of applied physics》 |2016年第7s3期|07MD02.1-07MD02.4|共4页
  • 作者

    Frietsch Bjorn; Carley Robert; Gleich Markus; Teichmann Martin; Bowlan John; Weinelt Martin;

  • 作者单位

    Free Univ Berlin, Dept Phys, D-14195 Berlin, Germany|Max Born Inst, D-12489 Berlin, Germany;

    Free Univ Berlin, Dept Phys, D-14195 Berlin, Germany|Max Born Inst, D-12489 Berlin, Germany;

    Free Univ Berlin, Dept Phys, D-14195 Berlin, Germany;

    Free Univ Berlin, Dept Phys, D-14195 Berlin, Germany|Max Born Inst, D-12489 Berlin, Germany;

    Free Univ Berlin, Dept Phys, D-14195 Berlin, Germany;

    Free Univ Berlin, Dept Phys, D-14195 Berlin, Germany;

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