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MA: Fachverband Magnetismus

MA 31: Poster II

MA 31.24: Poster

Mittwoch, 19. März 2025, 17:00–19:30, P1

Magnon-phonon scattering on ultrafast timescales — •Nabil Makadir, Kai Leckron, and Hans Christian Schneider — Physics Dept, University of Kaiserslautern-Landau (RPTU), Kaiserslautern, Germany

In the ultrafast demagnetization of ferromagnets, electron-magnon scattering likely plays an important role. Recently it has been shown in the framework of a two-band Stoner model (arXiv:2304.14978) that electron-magnon scattering processes lead to the creation of non-equilibrium magnons at large wave vectors on ultrafast time scales. In this contribution, we investigate how a large density of high-q magnons, as it is created during the demagnetization process, relaxes due to magnon-phonon and magnon-electron interactions. Treating phonons as bosons, we solve the dynamical equations for the magnon and phonon distributions including the relevant interactions at the level of Boltzmann scattering integrals. From the numerical results, we draw conclusions for the remagnetization process.

Keywords: magnon-phonon interaction; electron-magnon interaction; ultrafast demagnetization; ferromagnets