Ab Initio Investigation of the Elliott-Yafet Electron-Phonon Mechanism in Laser-Induced Ultrafast Demagnetization
Ab Initio Investigation of the Elliott-Yafet Electron-Phonon Mechanism in Laser-Induced Ultrafast Demagnetization
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DOI：
10.1103/physrevlett.107.207201
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发表时间：
2011-11-07
影响因子：
8.6
通讯作者：
Oppeneer, P. M.
中科院分区：
文献类型：
--
作者：
Carva, K.;Battiato, M.;Oppeneer, P. M.
从铁磁Ni的第一性原理出发，计算了自旋翻转（SF） Eliashberg函数，准确地建立了Elliott-Yafet电子-声子SF散射对Ni飞秒激光驱动退磁的贡献。这是用来计算SF概率和退磁率激光产生的热化以及非平衡电子分布。发现热化电子的SF概率增加，但诱导退磁率非常小。非平衡电子分布有较大的退磁率，但其贡献太小，不足以解释飞秒退磁。
The spin-flip (SF) Eliashberg function is calculated from first principles for ferromagnetic Ni to accurately establish the contribution of Elliott-Yafet electron-phonon SF scattering to Ni's femtosecond laser-driven demagnetization. This is used to compute the SF probability and demagnetization rate for laser-created thermalized as well as nonequilibrium electron distributions. Increased SF probabilities are found for thermalized electrons, but the induced demagnetization rate is extremely small. A larger demagnetization rate is obtained for nonequilibrium electron distributions, but its contribution is too small to account for femtosecond demagnetization.