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首页> 外文期刊>Physical review >Ab initio theory of electron-phonon mediated ultrafast spin relaxation of laser-excited hot electrons in transition-metal ferromagnets
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Ab initio theory of electron-phonon mediated ultrafast spin relaxation of laser-excited hot electrons in transition-metal ferromagnets

机译：电子-声子介导的过渡金属铁磁体中激光激发热电子超快自旋弛豫的从头算理论

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摘要

We report a computational theoretical investigation of electron spin-flip scattering induced by the electron-phonon interaction in the transition-metal ferromagnets bcc Fe, fee Co, and fee Ni.The Elliott-Yafet electron-phonon spin-flip scattering is computed from first principles, employing a generalized spin-flip Eliashberg function as well as ab initio computed phonon dispersions.Aiming at investigating the amount of electron-phonon mediated demagnetization in femtosecond laser-excited ferromagnets, the formalism is extended to treat laser-created thermalized as well as nonequilibrium, nonthermal hot electron distributions.Using the developed formalism we compute the phonon-induced spin lifetimes of hot electrons in Fe, Co, and Ni.The electron-phonon mediated demagnetization rate is evaluated for laser-created thermalized and nonequilibrium electron distributions.Nonthermal distributions are found to lead to a stronger demagnetization rate than hot, thermalized distributions, yet their demagnetizing effect is not enough to explain the experimentally observed demagnetization occurring in the subpicosecond regime.
机译：我们报告了在过渡金属铁磁体bcc Fe，Fe和Ni中由电子-声子相互作用引起的电子自旋翻转散射的计算理论研究.Elliott-Yafet电子-声子自旋翻转散射是从第一计算的原理，利用广义自旋翻转Eliashberg函数以及从头算起的声子色散。旨在研究飞秒激光激发的铁磁体中电子-声子介导的去磁的量，形式主义扩展到处理激光产生的热化以及利用发达的形式主义，我们计算了声子在Fe，Co和Ni中由声子引起的热电子的自旋寿命，并评估了电子声子介导的退磁率，以评估激光产生的热化和非平衡电子分布。发现分布比热的，热的分布导致更强的去磁率，但是它的退磁作用不足以解释在皮秒范围内发生的实验观察到的退磁。

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  • 来源
    《Physical review》 |2013年第18期|184425.1-184425.14|共14页
  • 作者

    K.Carva; M.Battiato; D.Legut; P.M.Oppeneer;

  • 作者单位

    Department of Physics and Astronomy, Uppsala University,P.O.Box 516, S-75120 Uppsala, Sweden,Charles University, Faculty of Mathematics and Physics, Department of Condensed Matter Physics, Ke Karlovu 5,CZ-12116 Prague 2, Czech Republic;

    Department of Physics and Astronomy, Uppsala University,P.O.Box 516, S-75120 Uppsala, Sweden;

    Nanotechnology Centre, VSB-Technical University of Ostrava,17.listopadu 15, CZ-708 33 Ostrava, Czech Republic;

    Department of Physics and Astronomy, Uppsala University,P.O.Box 516, S-75120 Uppsala, Sweden;

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  • 正文语种 eng
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  • 关键词

    magnetooptical effects; theory, models, and numerical simulation;

    机译：磁光效应;理论;模型和数值模拟;

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