Skyrmions as Quasiparticles: Free Energy and Entropy

Schick, Daniel and Weißenhofer, Markus and Rózsa, Levente and Nowak, Ulrich (2021) Skyrmions as Quasiparticles: Free Energy and Entropy. PHYSICAL REVIEW B : COVERING CONDENSED MATTER AND MATERIALS PHYSICS, 103 (21). pp. 1-9. ISSN 2469-9950 (print); 2469-9969 (online)

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Abstract

The free energy and the entropy of magnetic skyrmions with respect to the collinear state are calculated for a (Pt0.95Ir0.05)/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.

Item Type:	Article
Subjects:	Q Science / természettudomány > QC Physics / fizika > QC06 Physics of condensed matter / szilárdtestfizika
Depositing User:	Dr. Levente Rózsa
Date Deposited:	24 Nov 2021 13:41
Last Modified:	24 Nov 2021 13:58
URI:	http://real.mtak.hu/id/eprint/133746

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