Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 25: Skyrmions I (joint session MA/TT)

TT 25.12: Vortrag

Dienstag, 17. März 2020, 12:45–13:00, POT 6

The Chimera skyrmion collapse mechanism in harmonic transition state theory — •Stephan von Malottki1, Pavel F. Bessarab2,3, and Stefan Heinze11Institute of Theoretical Physics and Astrophysics, University of Kiel — 2University of Iceland, Reykjavík, Iceland — 3ITMO University, St. Petersburg, Russia

Recent studies reveal a new skyrmion annihilation mechanism via the Chimera skyrmion state [1-3]. We study the skyrmion lifetimes for this collapse mechanism in the ultrathin film system Pd/Fe/Ir(111) by a combination of nudged elastic band method calculations and harmonic transition state theory, based on an atomistic spin model parametrised from density functional theory [4]. The skyrmion lifetime has the form of an Arrhenius law and requires the energy barriers and prefactors of all relevant collapse mechanisms [5,6]. We address the crossover from the radial symmetric skyrmion collapse to the Chimera mechanism as well as the challenge of identifying and treating new Goldstone modes correctly.

[1] Meyer et al., Nat. Commun. 10, 3823 (2019)

[2] Heil et al., Phys. Rev. B 100, 134424 (2019)

[3] Desplat et al., Phys. Rev. B 99, 174409 (2019)

[4] von Malottki et al., Sci. Rep. 7, 12299 (2017)

[5] Bessarab et al., Sci. Rep. 8, 3433 (2018)

[6] von Malottki et al., Phys. Rev. B 99, 060409(R) (2019)

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