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The magnetization response of bulk ferromagnets after excitation by anultrashort optical pulse is calculated using a dynamical model of theElliott-Yafet type that includes the effects of the spin-orbit interaction inthe ab-initio ferromagnetic band structure, the electron-phonon interaction atthe level of Boltzmann scattering integrals, and dynamical changes in thetemperature of the phonon bath. Using realistic parameters for the ultrashortoptical pulse, the computed maximum magnetization quenching achievable withelectron-phonon scattering in a fixed band structure is much smaller than thequenching observed in experiments. Heating of the phonon bath is found to notappreciably change the magnetization dynamics on ultrashort timescales.

Electron-phonon scattering dynamics in ferromagnets on ultrafast timescales: Influence of the phonon temperature