Berlin 2018 – scientific programme
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MA: Fachverband Magnetismus
MA 47: Focus Session: Spinorbitronics – from efficient charge/spin conversion based on spin-orbit coupling to chiral magnetic skyrmions II (joint session MA/TT)
MA 47.6: Talk
Thursday, March 15, 2018, 16:45–17:00, H 1012
Analysis of the Dzyaloshinskii-Moriya interaction and spin-orbit torques in Co-based trilayers — •Jan-Philipp Hanke, Frank Freimuth, Stefan Blügel, and Yuriy Mokrousov — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany
Originating from the interplay of spin-orbit coupling and broken inversion symmetry, the Dzyaloshinskii-Moriya interaction (DMI) attracts ever-growing attention as it mediates the formation of chiral spin textures such as magnetic skyrmions. To predict the magnitude of this chiral interaction from ab initio, typically, one adopts either demanding computational frameworks or limiting approximations for the spin-orbit interaction. In contrast, we present an advanced Wannier interpolation scheme that evaluates DMI in its modern theory [1] based on the ferromagnetic ground state including spin-orbit coupling self-consistently. Utilizing this technique, we identify the microscopic origin of DMI and spin-orbit torques in the trilayers IrxPt1−x/Co/Pt and AuxPt1−x/Co/Pt [2]. Tuning the composition x, we find that DMI changes sign, promoting the respective systems as promising candidates for detailed experimental studies. We examine also the consequences of the obtained anisotropy of the spin-orbit torques with the magnetization direction for the dynamical properties of skyrmions.
Funding from the DFG (Grant No. MO 1731/5-1) and from the EU Horizon 2020 via the FET-Open project MAGicSky is acknowledged.
[1] F. Freimuth et al., J. Phys. Condens. Matter 26, 104202 (2014).
[2] J.-P. Hanke et al., arXiv:1711.02657.