Skyrmions as quasiparticles : free energy and entropy

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SCHICK, Daniel, Markus WEISSENHOFER, Levente RÓZSA, Ulrich NOWAK, 2020. Skyrmions as quasiparticles : free energy and entropy. In: Physical Review B. American Physical Society (APS). 103(21), 214417. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.103.214417

@article{Schick2020-12-29T10:01:20ZSkyrm-54354, title={Skyrmions as quasiparticles : free energy and entropy}, year={2020}, doi={10.1103/PhysRevB.103.214417}, number={21}, volume={103}, issn={2469-9950}, journal={Physical Review B}, author={Schick, Daniel and Weißenhofer, Markus and Rózsa, Levente and Nowak, Ulrich}, note={Article Number: 214417} }

Schick, Daniel Rózsa, Levente Nowak, Ulrich terms-of-use Nowak, Ulrich The free energy and the entropy of magnetic skyrmions with respect to the collinear state are calculated for a (Pt<sub>0.95</sub>Ir<sub>0.05</sub>)/Fe bilayer on Pd(111) via atomistic spin model simulations. The simulations are carried out starting from very low temperatures where the skyrmion number is conserved up to the range where skyrmions are constantly created and destroyed by thermal fluctuations, highlighting their quasiparticle nature. The higher entropy of the skyrmions at low temperature leads to a reduced free energy, such that the skyrmions become energetically preferred over the collinear state due to entropic stabilization as predicted by linear spin-wave theory. Going beyond the linear spin-wave approximation, a sign change is shown to occur in the free energy as well as the entropy at elevated temperature. Weißenhofer, Markus Weißenhofer, Markus Skyrmions as quasiparticles : free energy and entropy 2021-07-19T12:55:12Z Schick, Daniel 2020-12-29T10:01:20Z Rózsa, Levente 2021-07-19T12:55:12Z eng

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