Regensburg 2022 – scientific programme

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MA: Fachverband Magnetismus

MA 8: Ultrafast Magnetization Effects 1

MA 8.5: Talk

Monday, September 5, 2022, 16:00–16:15, H37

Electron-Magnon Scattering Dynamics in a two-band Stoner Model — •Félix Dusabirane, Kai Leckron, Sanjay Ashok, Bärbel Rethfeld, and Hans Christian Schneider — Physics Department & Research Center OPTIMAS, University of Kaiserslautern, Germany

We use a microscopic model to study carrier dynamics in ferromagnets due to electron-magnon scattering on ultrafast timescales. We employ a simple model band structure (Stoner model), for which the electron magnon-interaction is formally obtained as coupling to a Heisenberg spin system in the Hamiltonian. We compute the dynamics of momentum resolved electron and magnon distributions due to electron-magnon and statically screened electron-electron scattering, which are treated at the level of Boltzmann scattering integrals. We find that electron-magnon scattering leads to a pronounced non-equilibrium for magnon modes that couple directly to Stoner transitions. The spin-flip scattering with electrons results in a transient electron spin polarization, which is similar for excitations either within the minority or the majority band. The influence of model parameters such as band filling and exchange coupling strengths will be discussed.