Regensburg 2022 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 35: Poster 2

MA 35.32: Poster

Donnerstag, 8. September 2022, 16:00–18:00, P4

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

We simulate the complex phenomena arising in a magnetic film after femtosecond laser irradiation with help of a hybrid model. This model consists of a combination of two methods: The µ T model [1] and a kinetic Monte Carlo method [2]. The former treats the low-energetic electrons as an ensemble, tracing spin resolved temperatures and chemical potentials, as well as their gradients [3]. The latter traces individual high-energetic non-equilibrium electrons, including spin-dependent scattering processes and spin-flip probabilities. We present first investigations of how non-equilibrium electrons influence the magnetization dynamics for Nickel.

The long-term perspective of this project is to develop a model that can describe both the transport of the electron ensemble and individual high-energetic super-diffusive electrons. This allows to study the different types of non-equilibrium transport and their effects on magnetization dynamics.

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

[2] J. Briones, H.C.Schneider, B.Rethfeld, J. Phys, 6, 035001 (2022).

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