Berlin 2024 – scientific programme

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MA: Fachverband Magnetismus

MA 9: Ultrafast Magnetization Effects II

MA 9.7: Talk

Monday, March 18, 2024, 17:00–17:15, H 2013

Ultrafast electron scattering in a ferromagnetic two-sublattice system — •Ariyan Tavakoli, Kai Leckron, and Hans Christian Schneider — Physics Department and Research Center OPTIMAS, RPTU Kaiserslautern-Landau, Germany

We investigate an exchange coupled two-sublattice system as a model for a ferromagnetic alloy, as introduced in [1]. In addition to the exchange coupling between an itinerant and a localized spin system, and the electron-phonon scattering in the itinerant system we also include the electron-electron Coulomb interaction in the itinerant system. We study numerically the heat-induced ultrafast magnetization dynamics due to electron-electron, electron-phonon, Elliott-Yafet spin-flip and exchange scattering and discuss different scenarios for the demagnetization and relaxation dynamics of the sublattice. Our results show the impact of electron-electron scattering for the spin dynamics on ultrashort timescales.

[1] K. Leckron, A. Baral and H. C. Schneider, "Exchange scattering on ultrafast timescales in a ferromagnetic two-sublattice system", Appl. Phys. Lett. 120, 102407 (2022).

Keywords: ultrafast spin dynamics; exchange interaction; ferrimagnets