Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 1: Computational Magnetism I
MA 1.5: Talk
Monday, March 16, 2020, 10:30–10:45, HSZ 04
Electric field control of magnetism through transverse currents: first-principles calculations on XAS/XMCD experiments. — Sergey Mankovsky, •Alberto Marmodoro, Eszter Simon, and Hubert Ebert — Department Chemie, Ludwig-Maximilians-Universität München
Recent x-ray magnetic dichroism spectroscopy (XMCD) experiments have investigated a variety of electric field-controlled magnetism scenarios [1-3]. We consider a 2D Co/Pt heterostructure, studied in various geometries, under the influence of an applied electric field parallel to the interface and also to the equilibrium magnetization direction. This setup has been reported to produce an additional, perpendicular out-of-plane magnetization contribution, proportional to the current density and detectable through variation in the absorption cross-section for circularly polarized x-ray at the Co L2,3 edges [3]. We investigate this effect by means of first-principles linear response calculations, performed at a fully relativistic level using the Korringa-Kohn-Rostoker method based on DFT. The scheme allows us to assess different physical mechanisms behind the experimental observation, to explore the impact of sample thickness and surface/interface effects, and study effects of spin-orbit torque, spin accumulation and to cross-compare ab-initio results with calculated XMCD spectra.
[1] R.Kukreja et al., PRL 115, 096601 (2015). [2] K. T. Yamada et al., PRL 120, 157203 (2018). [3] C.Stamm et al., PRB 100, 024426 (2019).