Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 51: Magnetism Poster B

MA 51.47: Poster

Donnerstag, 4. April 2019, 15:00–18:00, Poster C

Effect of interlayer insertion on spin pumping in Co₄₀Fe₄₀B₂₀/X/Pt heterostructures — •Matthias Reinhard Schweizer¹, Sascha Keller¹, Evangelos Papaioannou¹, Simon Häuser¹, Moritz Hofherr^1,2, Benjamin Stadtmüller^1,2, Martin Aeschlimann¹, Burkard Hillebrands¹, and Andrés Conca¹ — ¹FB Physik and Landesforschungszentrum OPTIMAS, TU Kaiserslautern, Germany — ²Graduate School Materials Science in Mainz, Mainz, Germany

In many spin pumping experiments, Pt is used to detect a spin current indirectly via the inverse spin Hall effect (ISHE). However, Pt has been shown to also exhibit the magnetic proximity effect (MPE), which could have a substantial impact on the interface transparency and damping parameter. In this work, we investigate the Co₄₀Fe₄₀B₂₀/X/Pt multilayer system (X=Al,Ta,Cr) with varying thicknesses. Direct contact between Co₄₀Fe₄₀B₂₀ and Pt induces MPE in Pt. In this case, even a thin NM spacing layer is expected to suppress the MPE completely. We present VNA-FMR data on these systems and angle-resolved rectification voltage measurements, where anisotropic magnetoresistance (AMR) and the anomalous Hall effect signals are separated from the ISHE signal. We find that the formation of FM Pt gives rise to a strong AMR signal, but does not have a significant influence on the induced spin current. The existence of magnetic moments in Pt is verified my means of element sensitive measurements with pulses from high-harmonic generation. Support by M-era.Net, HEUMEM and SFB/TRR 173 SPIN+X is acknowledged.