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MA: Fachverband Magnetismus

MA 46: Poster II

MA 46.50: Poster

Thursday, March 21, 2024, 15:00–18:00, Poster C

Hybrid simulation tracing non-equlibrium spin-dynamics — •Lukas Jonda, Johan Briones, Sebastian T. Weber, Christopher Seibel, Sanjay Ashok, and Baerbel Rethfeld — Department of Physics and Research Center OPTIMAS, RPTU Kaiserslautern-Landau, Kaiserslautern

We simulate the interplay of several non-equilibrium phenomena arising in a magnetic film after femtosecond laser irradiation using a hybrid model. This approach consists of a combination of two methods: the µT model [1] and a kinetic Monte Carlo method [2]. The former treats the low-energetic electrons as ensembles, tracing spin-resolved temperatures and chemical potentials, as well as their gradients [3]. The latter traces the dynamics of individual high energetic non-equilibrium electrons, including spin-dependent scattering processes and a spin-flip probabilities. A model that can describe the transport of both the electronic ensemble and individual high-energy super-diffusive electrons is currently being developed. This allows the study of different types of non-equilibrium transport and their effects on magnetization dynamics.

References:

[1] B.Y. Mueller and B. Rethfeld, Phys. Rev. B, 90, 144420 (2014).

[2] J. Briones et al., J. Phys, 6, 035001 (2022).

[3] S. Ashok et al., App. Phys. Lett. 120, 142402 (2022).

Keywords: non-equilibrium electrons; spin-dynamics and transpot