The chirality of Damon-Eshbach (DE) magnons affects the transport of energy and angular momentum at the surface of magnetic films and spheres. We calculate the surface-disorder-limited dephasing and transport lifetimes of surface modes of sufficiently thick high-quality magnetic films such as yttrium iron garnet. In spite of their chirality surface magnons are not protected, but interact strongly with smooth surface roughness. Nevertheless, for long-range disorder the transport is much less affected by the suppressed back scattering (vertex correction). Moreover, in the presence of roughness ferromagnetic resonance under a \textit{uniform} microwave field can gennerate a considerable amount of surface magnons.
Cite
@article{arxiv.1901.11046,
title = {Surface dynamics of rough magnetic films},
author = {Tao Yu and Sanchar Sharma and Yaroslav M. Blanter and Gerrit E. W. Bauer},
journal= {arXiv preprint arXiv:1901.11046},
year = {2019}
}