Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 24: Spin Transport and Orbitronics, Spin-Hall Effects
MA 24.7: Vortrag
Mittwoch, 7. September 2022, 16:30–16:45, H37
Dynamic and static detection of current-induced spin-orbit magnetic fields — •Lin Chen1, Matthias Kronseder2, Dieter Schuh2, Dominique Bougeard2, Jaroslav Fabian2, Dieter Weiss2, and Christian Back1 — 1Department of Physics, Technical University of Munich, Garching bei Munich, Germany — 2Institute of Experimental and Applied Physics, University of Regensburg, Regensburg
Quantifying current-induced effective spin-orbit magnetic-fields (SOFs) accurately is a central task for spin-orbitronics. Several methods, e.g., spin-transfer torque ferromagnetic resonance or second harmonic Hall measurements, have been frequently used in the past 10 years. However, most methods show weaknesses, and are not ideal to determine SOFs. Here, we will show two new approaches in this regard. Firstly, we show that it is possible to quantify the SOFs through an analysis of the shape of standing spin-wave patterns, which are probed by time-solved magneto-Kerr microscopy in a laterally confined Fe/GaAs system. This method, which is conceptually different from previous approaches based on lineshape analysis, is phase independent and self-calibrated1. Secondly, we show that one can simultaneously quantify the SOFs and the unidirectional magnetoresistance (UMR) by measuring the second harmonic longitudinal resistance in Co/Pt bi-layers2. From these measurements, we can: I) establish a connection between SOFs and UMR, and II) discuss the origin of SOFs. References:1.L. Chen et. al., Phys. Rev. B. 104, 014425 (2021).2.L. Chen et. al., Phys. Rev. B 105, L020406 (2022).