期刊
NEW JOURNAL OF PHYSICS
卷 20, 期 -, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1367-2630/aae282
关键词
magnetic skyrmions; thermodynamic study; Monte Carlo simulations; frustration of magnetic exchange
资金
- DFG [DU1489/2-1]
- Alexander von Humboldt Foundation
- Graduate School Materials Science in Mainz
- Grant Agency of the Czech Republic [14-37427G]
- ERC Synergy Grant SC2 [610115]
- European Unions Horizon 2020 research and innovation program [665095]
- [(SFB/TRR) 173]
We use an atomistic spin model derived from density functional theory calculations for the ultra-thin film Pd/Fe/Ir(111) to show that temperature induces coexisting non-zero skyrmion and anti-skyrmion densities. We apply the parallel tempering Monte Carlo method in order to reliably compute thermodynamical quantities and the B-T phase diagram in the presence of frustrated exchange interactions. We evaluate the critical temperatures using the topological susceptibility. We show that the critical temperatures depend on the magnetic field in contrast to previous work. In total, we identify five phases: spin spiral, skyrmion lattice, ferromagnetic phase, intermediate region with finite topological charge and paramagnetic phase. To explore the effect of frustrated exchange interactions, we calculate the B-T phase diagram, when only effective exchange parameters are taken into account.
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