Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 22: Surface Magnetism (Joint Session with O)
MA 22.6: Vortrag
Dienstag, 21. März 2017, 11:15–11:30, HSZ 401
Energy barriers of skyrmion annihilation in Pd/Fe/Ir(111) — •Stephan von Malottki1, Bertrand Dupé1, Pavel Bessarab2, and Stefan Heinze1 — 1Institute of Theoretical Physics and Astrophysics, University of Kiel, Germany — 2School of Engineering and Natural Sciences - Science Institute, University of Iceland, Iceland
Magnetic skyrmions are currently discussed as promising candidates for spintronic devices [1]. The understanding of skyrmion stability in realistic systems is a key issue. The calculation of minimum energy paths (MEPs) using the geodesic nudged elastic band (GNEB) method provides detailed information about energy barriers protecting skyrmions from other available states as well as reveals microscopic mechanisms of their formation and annihilation [2,3]. Up to now, such calculations have been performed with nearest-neighbour exchange [2,3]. Here, we investigate an ultrathin film of Pd/Fe/Ir(111) – a model system for skyrmion formation [4,5] – with atomistic spin dynamics, based on parameters obtained by density functional theory [5]. The energy barriers of skyrmion annihilation are calculated with the GNEB method, including the effects of frustrated exchange.
[1] A. Fert et al., Nature Nanotech 8, 152-156 (2013)
[2] P. Bessarab et al., Computer. Phys. Comm. 196, 335-347 (2015)
[3] I. Lobanov et al., Phys. Rev. B 94, 174418 (2016)
[4] N. Romming et al., Phys. Rev. Lett. 114, 177203 (2015)
[5] B. Dupé et al., Nature Comm. 5, 4030 (2014)