Dresden 2020 – scientific programme

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MA: Fachverband Magnetismus

MA 54: Spin: Transport, Orbitronics and Hall Effects II

MA 54.5: Talk

Thursday, March 19, 2020, 16:00–16:15, HSZ 403

Spin orbit torques in Weyl semimetal /Ferromagnet and TMDC/ Ferromagnet bilayers — •Avanindra Kumar Pandeya, Amilcar Bedoya Pinto, Banabir Pal, Pranava Keerthi Sivakumar, Binoy Krishna Hazra, and Stuart Parkin — Max Planck Institute of Microstructure Physics

Weyl semimetals (WSMs) and Transition Metal Dichalcogenides (TMDCs) are two classes of quantum materials that are expected to have high spin-to-charge conversion efficiency. We have grown TaP/Py and NbSe2/Py bilayers using molecular beam epitaxy (MBE) which gives us precise control of the layer thickness and high-quality interfaces required for efficient spin transfer and spin-to-charge conversion experiments. In this work, we use the second harmonic Hall measurement to explore the spin-orbit torques (SOTs) produced by the WSMs and the TMDCs. We disentangle the different torque contributions by performing angular and field-dependent measurements in the bilayer devices, extracting the net spin-orbit torques related to effective charge-to-spin conversion efficiency in both material systems. Finally, we compare our results with the ones obtained by a different technique i.e. spin-torque ferromagnetic resonance (ST-FMR).