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arXiv · 1308.0450

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

M. Caminale·A. Ghosh·S. Auffret·U. Ebels·K. Ollefs·F. Wilhelm·A. Rogalev·W. E. Bailey
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Abstract

We investigated the spin pumping damping contributed by paramagnetic layers (Pd, Pt) in both direct and indirect contact with ferromagnetic Ni$_{81}$Fe$_{19}$ films. We find a nearly linear dependence of the interface-related Gilbert damping enhancement $Δα$ on the heavy-metal spin-sink layer thicknesses t$_\textrm{N}$ in direct-contact Ni$_{81}$Fe$_{19}$/(Pd, Pt) junctions, whereas an exponential dependence is observed 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 induced moments in Pt, Pd near the interface with Ni$_{81}$Fe$_{19}$, quantified using X-ray magnetic circular dichroism (XMCD) measurements. Our results show that the scattering of pure spin current is configuration-dependent in these systems and cannot be described by a single characteristic length.

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M. Caminale, A. Ghosh, S. Auffret, U. Ebels, K. Ollefs, F. Wilhelm, A. Rogalev, W. E. Bailey. 2016-04-05. Spin pumping damping and magnetic proximity effect in Pd and Pt spin-sink layers. https://doi.org/10.1103/physrevb.94.014414

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