Regensburg 2022 – scientific programme

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MA: Fachverband Magnetismus

MA 35: Poster 2

MA 35.34: Poster

Thursday, September 8, 2022, 16:00–18:00, P4

Ferromagnetic resonance study of spin pumping in epitaxial Fe/Rh bilayers — •Jonas Wiemeler, Ali Can Actas, Michael Farle, and Anna Semisalova — Faculty of Physics and CENIDE, University of Duisburg-Essen, 47057 Duisburg, Germany

The alloy FeRh has been studied extensively for structural, electrical and magnetic properties. On the other hand spin dynamics in a Fe/Rh thin film bilayer system in detail has not been addressed yet. In this work, 5 nm Fe films capped with Rh of thicknesses (0, 1, 2, 3, 5, 10, 15) nm were grown on GaAs(100) substrates using molecular beam epitaxy (MBE). Ferromagnetic resonance (FMR) experiments at room temperature, utilising both angular X-Band and frequency dependence (1-40GHz), were used to characterise the magneto dynamic properties of these bilayers. The growth characteristics of Rh on a 5 nm substrate Fe layer have been investigated using Auger electron spectroscopy (AES) measurements during the Rh growth. It was found, that Rh grows epitaxially on Fe in a layer-by-layer manner. The thickness dependence of the magnetisations precession damping, measured using FMR, shows an exponential behaviour which was analysed in terms of a spin pumping effect. We found, that the spin pumping efficiency of Rh is comparable to Pt, while the spin flip rate compares to that of Pd.
Funding by DFG Project No. 392402498 (SE 2852/1-1 | AL 618/37-1) and helpful discussion with R. Meckenstock and T. Strusch are acknowledged.