Department of Physics and Astronomy, Uppsala University, Sweden.
Phys Rev Lett. 2011 Nov 11;107(20):207201. doi: 10.1103/PhysRevLett.107.207201. Epub 2011 Nov 7.
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.
自旋翻转（SF）Eliashberg 函数是从铁磁 Ni 的第一性原理计算得出的，以准确确定 Elliott-Yafet 电子-声子 SF 散射对 Ni 的飞秒激光驱动去磁的贡献。这用于计算激光产生的热平衡和非平衡电子分布的 SF 概率和去磁率。对于热平衡电子，发现 SF 概率增加，但感应去磁率非常小。对于非平衡电子分布，获得了更大的去磁率，但它的贡献太小，无法解释飞秒去磁。
