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The spin-flip (SF) Eliashberg function is calculated from first-principlesfor ferromagnetic Ni to accurately establish the contribution of Elliott-Yafetelectron-phonon SF scattering to Ni's femtosecond laser-driven demagnetization.This is used to compute the SF probability and demagnetization rate forlaser-created thermalized as well as non-equilibrium electron distributions.Increased SF probabilities are found for thermalized electrons, but the induceddemagnetization rate is extremely small. A larger demagnetization rate isobtained for {non-equilibrium} electron distributions, but its contribution istoo small to account for femtosecond demagnetization.

Ab initio investigation of Elliott-Yafet electron-phonon mechanism in laser-induced ultrafast demagnetization