Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 57: Focus Session: Spinorbitronics – from efficient charge/spin conversion based on spin-orbit coupling to chiral magnetic skyrmions III (joint session MA/TT)
MA 57.5: Vortrag
Freitag, 16. März 2018, 10:45–11:00, H 1012
Skyrmion lifetimes in exchange frustrated ultrathin films — •Stephan von Malottki1, Pavel Bessarab2, Anna Delin3, and Stefan Heinze1 — 1Institute of Theoretical Physics and Astrophysics, University of Kiel — 2School of Engineering and Natural Sciences - Science Institute, University of Iceland — 3Department of Applied Physics, School of Engineering Sciences, KTH, Kista
The thermal stability of magnetic skyrmions is a key issue for potential applications in spintronic devices. An Arrhenius law can be used to describe the skyrmion lifetime as a function of temperature, which requires knowledge of
the energy barrier and the pre-exponential factor. While the energy barrier has already been adressed by several studies
[1], the pre-exponential factor for the skyrmion collapse remains unexplored [2,3].
Here, we adress the dependence of the pre-exponential factor on the external magnetic field and demonstrate that it changes qualitatively when exchange frustration is taken into account. We focus on the model system Pd/Fe/Ir(111) [4], described by an atomistic spin model based on parameters from density functional theory [1]. In our approach, the minimum energy paths and thereby the energy barriers are calculated by the geodesic nudged elastic band method, while the pre-exponential factors are determined by harmonic transition state theory [3].
von Malottki et al., Sci. Rep. 7, 12299 (2017)
J. Wild et al., Sci. Adv. 3.9, e1701704 (2017)
P. F. Bessarab et al., arXiv:1706.07173v2 (2017)
N. Romming et al., Phys. Rev. Lett. 114, 177203 (2015)