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MA: Fachverband Magnetismus

MA 8: Ultrafast Magnetization Effects I

MA 8.10: Talk

Monday, March 27, 2023, 17:30–17:45, HSZ 04

Electron-magnon interactions and Elliot-Yafet Spin Flips in a Two Band Stoner Model — •Felix Dusabirane, Kai Leckron, Bärbel Rethfeld, and Hans Christian Schneider — Physics Department & Research Center OPTIMAS, RPTU Kaiserslautern, Germany

We study electronic scattering dynamics in ferromagnets due to electron-magnon and electron-electron scattering. We also include an electron-electron spin-flip process, i.e., an electronic Elliott-Yafet mechanism and study the dynamics due to the interplay of the different scattering processes on the magnetization on ultrafast timescales. For the ferromagnetic band structure, we employ a model system consisting of two Stoner-exchange split bands and electron-magnon interaction, as can be obtained using a Heisenberg model where magnons (and electrons) are treated as bosons (and fermions). Electron-electron and electron-magnon scattering dynamics are studied with Boltzmann scattering integrals. We show that the spin-flip electron-electron scattering together with electron-magnon scattering generates non-equilibrium magnons, leading to a pronounced magnetization change that is mostly due to magnon generation and only to a very limited extent to a change in the spin polarization of the electrons. The effect of electron spin-flips and time dependent spin splitting will also be discussed.