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MA: Fachverband Magnetismus

MA 21: Poster I

MA 21.58: Poster

Dienstag, 13. März 2018, 09:30–13:00, Poster A

Effect of interlayer insertion on the spin pumping properties in Co₄₀Fe₄₀B₂₀/X/Pt,Ta heterostructures — •Matthias Schweizer, Andrés Conca, Sascha Keller, Evangelos Papaioannou, and Burkard Hillebrands — FB Physik and Landesforschungszentrum OPTIMAS, TU Kaiserslautern, Germany

Spin pumping is highly sensitive to the interface properties and composition of a given material system and in particular to the magnetic proximity effect (MPE). In order to optimize the spin transport across the interface, it is important to understand the different influences of these factors. In many spin pumping experiments, Pt and Ta are used to detect a spin current indirectly via the inverse spin Hall effect (ISHE). However, Pt has been shown to also exhibit MPE, which could have a substantial impact on the interface transparency and damping parameter. In this work, we investigate Co₄₀Fe₄₀B₂₀/X/Pt and Co₄₀Fe₄₀B₂₀/X/Ta multilayer systems, where X is Al, Ta or Cr with varying thicknesses. Contact between Co₄₀Fe₄₀B₂₀ and Pt gives rise to the MPE in Pt whereas this effect is not expected in Ta. In any case, even a thin NM spacing layer suppresses the MPE completely. We present VNA-FMR data on these systems and angle-resolved ISHE measurements, where spin rectification is separated from the spin pumping signal.
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