Regensburg 2025 – scientific programme

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MA: Fachverband Magnetismus

MA 26: Ultrafast Magnetization Effects I

MA 26.14: Talk

Wednesday, March 19, 2025, 18:30–18:45, H16

The dynamics of a memory-enhanced LLG equation — •Felix Hartmann¹ and Janet Anders^1,2 — ¹University of Potsdam, Institute of Physics and Astronomy, Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany — ²Department of Physics and Astronomy, University of Exeter, Stocker Road, Exeter EX4 4QL, UK

Recently, Anders et al. [1] have proposed a stochastic Landau-Lifshitz-Gilbert (LLG) equation which takes into account memory effects and colored thermal fluctuations, with either a classical, semi-classical or quantum thermostat. In this talk we will present some recent results that characterize the spin dynamics in different parameter regimes. We show how the proposed stochastic LLG equation has a well-described white-noise and Markovian limit of the spin dynamics. Further, going beyond the white-noise and Markovian limit, we present numerical results that show strong ultrafast and inertial effects in the spin dynamics, such as a faster relaxation and the appearance of nutation oscillations.

[1] J. Anders et al., New J. Phys. 24 033020 (2022)

Keywords: magnetism; LLG equation; non-Markovianity