Berlin 2018 – scientific programme

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 17: Skyrmions III (joint session MA/TT/KFM)

KFM 17.10: Talk

Wednesday, March 14, 2018, 17:15–17:30, EB 301

Frustration of the Dzyaloshinskii-Moriya interaction in ultrathin Co films — •Sebastian Meyer¹, Stephan Von Malottki¹, Bertrand Dupé², and Stefan Heinze¹ — ¹Institute of Theoretical Physics and Astrophysics, Christian-Albrechts-Universität zu Kiel, Leibnizstrasse 15, 24098 Kiel — ²Institute of Physics, Johannes Gutenberg Universität Mainz, Staudingerweg 7, 55128 Mainz

Non-collinear spin structures such as chiral domain walls and skyrmions are being intensively studied since they are promising for spintronic applications [1, 2]. The Dzyaloshinskii-Moriya interaction (DMI) is crucial for stabilizing these non-trivial magnetic states favoring a unique rotational sense. Here, we show frustration of the DMI in ultrathin Co films using density functional theory (DFT) as implemented in the FLEUR code [3]. We study Co monolayers and Pt/Co bilayers on the Ir(111) surface and calculate the energy dispersion of homogeneous flat spin spirals including spin-orbit coupling. Clockwise rotating spin spirals are preferred for large periods close to the ferromagnetic state while below a certain spin spiral period an anticlockwise sense is obtained. This effect arises due to competing DMI interactions with different neighbors that are of opposite sign. With our results from DFT, we parametrize an atomistic spin model and simulate domain wall properties using spin-dynamics simulations.
S. S. P. Parkin et al., Science 320, 190 (2008)
A. Fert et al., Nature Nano. 8, 152 (2013)
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