Regensburg 2019 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 14: Poster

DS 14.50: Poster

Dienstag, 2. April 2019, 17:00–20:00, Poster E

Spin-orbit torques in epitaxially grown two-dimensional transition metal dichalcogenides — •Amilcar Bedoya-Pinto, Avanindra Pandeya, Kai Chang, Ilya Kostanovskiy, Peter Werner, and Stuart Parkin — NISE department, Max Planck Institute of Microstructure Physics, Weinberg 2, 06120 Halle (Saale), Germany

Transition metal dichalcogenides (TMDCs), layered materials which have captured great attention due to their tunable electronic properties, are commonly fabricated via exfoliation of bulk crystals. Although there has been progress in fabricating devices out of exfoliated heterostructures, there are applications -such as spin transfer torques- that rely on atomically clean interfaces for an optimal performance. Our approach is to grow high-quality NbSe2 layers on Al2O3 (0001) by molecular beam epitaxy (MBE), gaining thereby a precise control of the layer thickness, electronic properties (doping) and improving the quality of the interfaces involved in spin transfer and spin-to-charge conversion. We use spin-torque ferromagnetic resonance (ST-FMR) of a NbSe2/NiFe/MgO device structure to quantify the spin-orbit torques (SOTs) produced by the TMDC thin films. First results show a strong symmetric component of the ferromagnetic resonance lineshape, as well as a scaling of the resonance linewidth with external DC bias, both signatures of sizable spin-orbit torques induced by the NbSe2 layer. This underlines the relevance of in-situ grown TMDC/ferromagnet heterostructures towards highly efficient spin-orbitronic devices.