Yuqing Ge,†,‡, Jan Rothörl,†, Maarten A. Brems,† Nico Kerber,† Raphael
Gruber,† Takaaki Dohi,† Mathias Kläui,† and Peter Virnau†
†Institut für Physik, Johannes Gutenberg-Universität, Staudinger Weg 9, D-55099 Mainz, Germany.
‡Department of Physics, Chalmers University of Technology, Göteborg 41296, Sweden.
To understand skyrmion behavior on a coarse-grained level, skyrmions are often described as 2D quasi particles evolving according to the Thiele equation. Interaction potentials are the key missing parameters for predictive modeling of experiments. We apply the Iterative Boltzmann Inversion technique commonly used in
soft matter simulations to construct potentials for skyrmion-skyrmion and skyrmion-magnetic material boundary interactions from a single experimental measurement without any prior assumptions of the potential form [1]. We find that the two interactions are purely repulsive and can be described by an exponential function for experimentally relevant skyrmions. This captures the physics on experimental time and length scales that are of interest for most skyrmion applications and typically inaccessible to atomistic or micromagnetic simulations. Finally, I will present applications of particle-based simulations to phase behavior of skyrmion lattices [2] and single skyrmions in extreme confinement [3] and outline current challenges.
References
[1] Y. Ge, J. Rothörl, M.A. Brems et al., arXiv:2110.14333v2 (2022).
[2] J. Zazvorka, F. Dittrich, Y. Ge et al., Adv. Funct. Mat. 30, 2004037 (2020).
[3] C.K. Song, N. Kerber, J. Rothörl et al., Adv. Funct. Mat. 31, 2010739 (2021).