Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 64: Spin Transport and Orbitronics, Spin-Hall Effects I (joint session MA/TT)
TT 64.9: Vortrag
Donnerstag, 21. März 2024, 11:45–12:00, H 2013
Spin-to-charge conversion in ferromagnetic heterostructures — •Misbah Yaqoob1, Fabian Kammerbauer2, Tom G. Saunderson2, Vitaliy I. Vasyuchka1, Dongwook Go3, Hassan Al-Hamdo1, Gerhard Jakob2, Yuriy Mokrousov2,3, Mathias Kläui2, and Mathias Weiler1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau, 67663 Kaiserslautern, Germany — 2Institut für Physik, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany — 3Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany
Spin-orbit torques (SOTs) can be used for efficient control of magnetization and the electrical detection of spin dynamics through the inverse spin Hall effect (iSHE) [1]. We investigate spin-to-charge conversion in ferromagnetic heterostructures based on perpendicular magnetic anisotropy (PMA) multilayers of [Co/Ni] and [Co/Pt] that generate SOTs in adjacent CoFeB thin films with in-plane magnetic anisotropy (IPA). We extract the spin dynamics and SOTs [2] using vector network analyzer ferromagnetic resonance spectroscopy (VNA-FMR). In our experiments, we found that our multilayers generate SOTs comparable in magnitude to Pt, in agreement with first-principles calculations. Additionally, we observed a pronounced dependence of the SOT on the IPA CoFeB layer thickness.
[1] T. Jungwirth et al., Nat. Mater. 11, 382 (2012).
[2] A. J. Berger et al., Phys. Rev. B 97, 94407 (2018).