Surface dynamics of rough magnetic films
arXiv:1901.11046 · doi:10.1103/PhysRevB.99.174402
Abstract
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.
arXiv comment12 pages, 6 figures
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- Giant magnon spin conductivity approaching the two-dimensional transport regime in ultrathin yttrium iron garnet films
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