Spin-wave propagation in an assembly of microfabricated 20 nm thick, 2.5 {\mu}m wide Yttrium Iron Garnet (YIG) waveguides is studied using propagating spin-wave spectroscopy (PSWS) and phase resolved micro-focused Brillouin Light Scattering ({\mu}-BLS) spectroscopy. We show that spin-wave propagation in 50 parallel waveguides is robust against microfabrication induced imperfections. Spin-wave propagation parameters are studied in a wide range of excitation frequencies for the Damon-Eshbach (DE) configuration. As expected from its low damping, YIG allows the propagation of spin waves over long distances (the attenuation lengths is 25 {\mu}m at \mu0H = 45 mT). Direct mapping of spin waves by {\mu}-BLS allows us to reconstruct the spin-wave dispersion relation and to confirm the multi-mode propagation in the waveguides, glimpsed by propagating spin-wave spectroscopy.
@article{arxiv.1610.08756,
title = {Spin-wave propagation in ultra-thin YIG based waveguides},
author = {M. Collet and O. Gladii and M. Evelt and V. Bessonov and L. Soumah and P. Bortolotti and S. O Demokritov and Y. Henry and V. Cros and M. Bailleul and V. E. Demidov and A. Anane},
journal= {arXiv preprint arXiv:1610.08756},
year = {2017}
}