We characterize spin wave propagation and its modification by an electrical current in Permalloy(Py)/Pt bilayers with Py thickness between 4 and 20 nm. First, we analyze the frequency non-reciprocity of surface spin waves and extract from it the interfacial Dzyaloshinskii-Moriya interaction constant Ds accounting for an additional contribution due to asymmetric surface anisotropies. Second, we measure the spin-wave relaxation rate and deduce from it the Py/Pt spin mixing conductance geff↑↓. Last, applying a \textit{dc} electrical current, we extract the spin Hall conductivity σSH from the change of spin wave relaxation rate due to the spin-Hall spin transfer torque. We obtain a consistent picture of the spin wave propagation data for different film thicknesses using a single set of parameters Ds=0.25 pJ/m, geff↑↓=3.2×1019 m−2 and σSH=4×105 S/m.
@article{arxiv.1909.04935,
title = {Determining key spin-orbitronic parameters by means of propagating spin waves},
author = {O. Gladii and M. Collet and Y. Henry and J. -V. Kim and A. Anane and M. Bailleul},
journal= {arXiv preprint arXiv:1909.04935},
year = {2020}
}