We demonstrate a microscopic magnonic-crystal waveguide produced by nano-patterning of a 20 nm thick film of Yttrium Iron Garnet. By using the phase-resolved micro-focus Brillouin light scattering spectroscopy, we map the intensity and the phase of spin waves propagating in such a periodic magnetic structure. Based on these maps, we obtain the dispersion and the attenuation characteristics of spin waves providing detailed information about the physics of spin-wave propagation in the magnonic crystal. We show that, in contrast to the simplified physical picture, the maximum attenuation of spin waves is achieved close to the edge of the magnonic band gap, which is associated with non-trivial reflection characteristics of spin waves in non-uniform field potentials.
@article{arxiv.1705.02267,
title = {Nano-patterned magnonic crystals based on ultrathin YIG films},
author = {M. Collet and M. Evelt and V. E. Demidov and J. L. Prieto and M. Muñoz and J. Ben Youssef and G. de Loubens and O. Klein and P. Bortolotti and V. Cros and A. Anane and S. O. Demokritov},
journal= {arXiv preprint arXiv:1705.02267},
year = {2017}
}
Comments
13 pages, 4 figures. Keywords: spin waves, magnonics, magnetic nanostructures