B-T phase diagram of Pd/Fe/Ir(111) computed with parallel tempering Monte Carlo

0510858 - FZÚ 2020 RIV GB eng J - Journal Article
Boettcher, M. - Heinze, S. - Egorov, S. - Sinova, Jairo - Dupé, B.
B-T phase diagram of Pd/Fe/Ir(111) computed with parallel tempering Monte Carlo.
New Journal of Physics. Roč. 20, č. 10 (2018), s. 1-12, č. článku 103014. ISSN 1367-2630. E-ISSN 1367-2630
R&D Projects: GA ČR GB14-37427G
EU Projects: European Commission(XE) 610115 - SC2
Institutional support: RVO:68378271
Keywords : magnetic skyrmions * B–Tphase diagram of Pd/Fe/Ir(111) * computed with parallel tempering Monte Carlo * Monte Carlo simulations
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 3.783, year: 2018
Method of publishing: Open access

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.
Permanent Link: http://hdl.handle.net/11104/0301230