Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 78: Focus Session: Spinorbitronics - From Efficient Charge/Spin Conversion Based on Spin-Orbit Coupling to Chiral Magnetic Skyrmions I (joint session MA/TT)
TT 78.2: Vortrag
Donnerstag, 15. März 2018, 10:00–10:15, H 1012
Impact of disorder on interfacial DMI for skyrmionics: intermixing and dusting — •Bernd Zimmermann1, William Legrand2, Nicolas Reyren2, Vincent Cros2, Stefan Blügel1, and Albert Fert2 — 1Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, Germany — 2Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, Plaiseau, France
The spin-orbit (SOC) based Dzyaloshinskii-Moriya interaction (DMI) is of utmost importance for future nanotechnological devices, e.g. for the stabilization of small magnetic skyrmions in heterostructures such as magnetic multilayers. Additionally, the problematic role of disorder in such systems, e.g. leading to pinning of skyrmions, needs to be overcome making production processes tedious and expensive.
Here, we at first reveal from ab initio calculations for the important example of Co-Pt bilayers a surprisingly profound robustness of the DMI against interfacial intermixing. We incorporate disorder realistically by employing the coherent-potential approximation in combination with the Korringa-Kohn-Rostoker method. The robustness of DMI is a result of compensation, which turns out to follow simple arguments. We also explore the possibility to tune the DMI by dusting the interface with various impurities, including noble and transition metals, and elements with low and high SOC (bismuth and boron).
We acknowledge funding by a postdoc fellowship from DAAD, the EU’s H2020 FET-open project “MAGicSky”, and computing time on JURECA of JSC and JARA-HPC of RWTH Aachen University.