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Magnons are one of the carriers of angular momentum that are involved in theultrafast magnetization dynamics in ferromagnets, but their contribution to theelectronic dynamics and their interplay with other scattering process thatoccur during ultrafast demagnetization has not yet been studied in theframework of a microscopic dynamical model. The present paper presents such aninvestigation of electronic scattering dynamics in itinerant ferromagnets atthe level of Boltzmann scattering integrals for the magnon distributions andspin-dependent electron distributions. In addition to electron-magnonscattering, we include spin-conserving and effective Elliott-Yafet likespin-flip electron-electron scattering processes and the influence of phonons.In our model system, the creation or annihilation of magnons leads totransitions between two spin-split electronic bands with energy and momentumconservation. Due to the presence of spin-orbit coupling, Coulomb scatteringtransitions between these bands are also possible, and we describe them on anequal footing in terms of Boltzmann scattering integrals. For an instantaneouscarrier excitation process we analyze the influence of both interactionprocesses on the magnon and spin-dependent electron dynamics, and show thattheir interplay gives rise to an efficient creation of magnons at higherenergies and wave vectors accompanied by only a small increase of theelectronic spin polarization. These results present a microscopic dynamicalscenario that shows how non-equilibrium magnons may dominate the magneticresponse of a ferromagnet on ultrafast timescales.

Interplay of electron-magnon scattering and spin-orbit induced electronic spin-flip fcattering in a two-band Stoner model