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We investigated the spin pumping damping contributed by paramagnetic layers(Pd, Pt) in both direct and indirect contact with ferromagneticNi$_{81}$Fe$_{19}$ films. We find a nearly linear dependence of theinterface-related Gilbert damping enhancement $\Delta\alpha$ on the heavy-metalspin-sink layer thicknesses t$_\textrm{N}$ in direct-contactNi$_{81}$Fe$_{19}$/(Pd, Pt) junctions, whereas an exponential dependence isobserved when Ni$_{81}$Fe$_{19}$ and (Pd, Pt) are separated by \unit[3]{nm} Cu.We attribute the quasi-linear thickness dependence to the presence of inducedmoments in Pt, Pd near the interface with Ni$_{81}$Fe$_{19}$, quantified usingX-ray magnetic circular dichroism (XMCD) measurements. Our results show thatthe scattering of pure spin current is configuration-dependent in these systemsand cannot be described by a single characteristic length.

Spin pumping damping and magnetic proximity effect in Pd and Pt spin-sink layers