Berlin 2018 – scientific programme
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MA: Fachverband Magnetismus
MA 52: Poster II
MA 52.43: Poster
Thursday, March 15, 2018, 15:00–18:00, Poster C
Thermal formation of skyrmion and antiskyrmion density — •Marie Böttcher1,2,3, Stefan Heinze2, Jairo Sinova1,4, and Bertrand Dupé1,2 — 1Institut für Physik, Johannes Gutenberg Universität Mainz, 55099 Mainz, Germany — 2Institute of Theoretical Physics and Astrophysics, University of Kiel, 24098 Kiel, Germany — 3Graduate School Materials Science in Mainz, 55128 Mainz, Germany — 4Institute of Physics, Academy of Sciences of the Czech Republic, Cukrovarnická 10, 162 53 Praha 6, Czech Republic
We use an atomistic extended Heisenberg model derived from density functional theory calculations [1] for the ultra-thin film system Pd/Fe/Ir(111) to show that temperature induces non-zero skyrmion and antiskyrmion densities. The parallel tempering Monte Carlo method is applied in order to reliably compute the B-T phase diagram in the presence of frustrated interactions and we introduce the topological susceptibility to evaluate the critical temperatures. The frustration of the exchange interaction turns out to have a crucial influence on the critical temperatures [2]. Here, we focus on the effect of the frustration of exchange interaction on the creation of skyrmions and antiskyrmions densities as a function of temperature and magnetic field.
[1] S. von Malottki et al., Sci. Rep. 7, 12299 (2017). [2] M. Böttcher et al., arXiv:1707.01708 (2017).