SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 8: Ultrafast Magnetization Effects I

MA 8.4: Vortrag

Montag, 27. März 2023, 16:00–16:15, HSZ 04

Temperature- and density-dependent spin-resolved coupling parameters in the µ T-model — •Christopher Seibel, Sebastian T. Weber, Tobias Held, Sanjay Ashok, Hans Christian Schneider, and Baerbel Rethfeld — Department of Physics and Research Center OPTIMAS, RPTU Kaiserslautern-Landau

Since the first ultrafast demagnetization experiment by Beaurepaire et al. in 1996, many models have been developed. They reach from complex kinetic descriptions to simpler temperature-based models. The former consider the microscopic interactions between the individual (quasi-)particles involved and allow to extract coupling parameters of the individual interactions. These parameters can enter temperature-based models and depend on the nonequilibrium distribution, (quasi-)temperature, densities and the spin-dependent density of states [1,2,3]. However, these coupling parameters are often assumed to be constant in temperature-based models.

In this work, we investigate the influence of transient coupling parameters, like the electron-phonon coupling parameter, on the magnetization dynamics. The spin-resolved coupling parameter is calculated using complete Boltzmann collision integrals and depends on the transient temperatures and densities of the individual subsystems.

[1] Lin et al., Phys. Rev. B 77, 075133
[2] Mueller and Rethfeld, Phys. Rev. B. 87, 035139
[3] Zahn et al., Phys. Rev. Research 3, 023032