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We report a computational theoretical investigation of electron spin-flipscattering induced by the electron-phonon interaction in the transition-metalferromagnets bcc Fe, fcc Co and fcc Ni. The Elliott-Yafet electron-phononspin-flip scattering is computed from first-principles, employing a generalizedspin-flip Eliashberg function as well as ab initio computed phonon dispersions.Aiming at investigating the amount of electron-phonon mediated demagnetizationin femtosecond laser-excited ferromagnets, the formalism is extended to treatlaser-created thermalized as well as nonequilibrium, nonthermal hot electrondistributions. Using the developed formalism we compute the phonon-induced spinlifetimes of hot electrons in Fe, Co, and Ni. The electron-phonon mediateddemagnetization rate is evaluated for laser-created thermalized andnonequilibrium electron distributions. Nonthermal distributions are found tolead to a stronger demagnetization rate than hot, thermalized distributions,yet their demagnetizing effect is not enough to explain the experimentallyobserved demagnetization occurring in the subpicosecond regime.

Ab initio theory of electron-phonon mediated ultrafast spin relaxation of laser-excited hot electrons in transition-metal ferromagnets