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Role of electron-magnon scatterings in ultrafast demagnetization

机译：电子磁振子散射在超快退磁中的作用

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Possible contributions of electron-magnon scatterings for the ultrafast demagnetization after femtosecond laser irradiation of films of Ni and Fe are investigated by the ab initio spin-density-functional electron theory. The calculations are based on Fermi's golden rule for transition rates, and the nonequilibrium after the action of the laser pulse is modeled by different chemical potentials for electrons which are in a "dominant spin-up" or in a "dominant spin-down" state. First, it is shown that the experimentally observed demagnetization cannot be described by electron-magnon spin-flip scatterings with concomitant changes of the electronic orbital moments which are immediately quenched by the crystal field, a mechanism which has been suggested by Carpene et al. Second, it is argued that the experimentally observed demagnetization possibly can be explained by a combination of individual spin-flip electron-phonon and spin-flip electron-magnon processes. A precondition for this is (among others) that the magnon emission rate is much larger than the magnon absorption rate. It is shown that this precondition is indeed fulfilled for Ni and especially for Fe.
机译：通过从头算自旋密度函数电子理论研究了飞秒激光辐照Ni和Fe膜后电子磁振子散射对超快退磁的可能贡献。计算基于费米的跃迁黄金定律，并且激光脉冲作用后的非平衡由处于“显着自旋”或“显着自旋”状态的电子的不同化学势建模。 。首先，证明了实验观察到的退磁不能用电子-磁振子自旋翻转散射来描述，伴随着电子轨道力矩的变化，该变化立即被晶体场淬灭，这是由Carpene等人提出的。其次，有人认为，实验观察到的退磁可能可以通过单个自旋翻转电子-声子和自旋翻转电子-马农过程的组合来解释。这样做的一个先决条件是（除其他外）马侬的发射速率远大于马侬的吸收速率。结果表明，对于镍，特别是对于铁，确实满足了该前提条件。

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