Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 24: Spin Transport and Orbitronics, Spin-Hall Effects
MA 24.4: Vortrag
Mittwoch, 7. September 2022, 15:45–16:00, H37
Atomic scale control of spin current transmission at interfaces — •Mohamed Amine Wahada1, Ersoy Sasioglu2, Wolfgang Hoppe3, Xilin Zhou1, Hakan Denis1, Reza Rouzegar4, Tobias Kampfrath4, Ingrid Mertig2, Stuart Parkin1, and Georg Woltersdorf3 — 1Max Planck Institute of Microstructure Physics, Weinberg 2, 06120 Halle(Saale) — 2Institute of Physics, Martin Luther University Halle-Wittenberg, Von-Seckendorff-Platz 1, 06120 Halle, Germany — 3Institute of Physics, Martin Luther University Halle-Wittenberg, von Danckelmann Platz 3, 06120 Halle, Germany — 4Department of Physics, Freie Universität Berlin, Arnimalee 14, 14195 Berlin, Germany
Ferromagnet (FM)/heavy metal (HM) bilayers are a fundamental building block in the field of spintronics. Exciting such bilayers with a femtosecond laser pulse can trigger ultrafast spin current (SC) from the FM to the HM layer. In the HM layer, the spin Hall effect converts the SC pulse into a charge current pulse, enabling efficient spintronic THz emitters. Equally as important as the SC generation process is the efficiency of the SC transmission across the FM/HM interface. We show experimentally that the SC transmission is partially suppressed when Ta is interfaced directly with 3d FM materials while this effect is absent when Pt is used as a HM. Based on theoretical calculations, we show that this is due to 3d-5d hybridization effects causing a significant moment reduction at the interface. This effect is expected for all 5d elements with less than half-filled 5d shell. Furthermore, we show that this effect can be eliminated by atomic scale oxide interlayers.