2026/07/29 by Jorge Marquez Chavez, Ondřej Wojewoda, Yixuan Song +2
Physics and Astronomy · #cond-mat.mes-hall #cond-mat.mtrl-sci #physics.app-ph
arxiv created 2026/07/29 · arxiv updated 2026/07/30
Controlling magnetic losses requires identifying the microscopic origin of extrinsic linewidth broadening. We introduce a Lippmann--Schwinger framework for two-magnon scattering from weak defect potentials, showing that scattering is set by the overlap between the perturbation of the effective field and degenerate spin-wave states. Applied to iron garnet films, YIG/GGG(111) and YIG/GGG(110), we identify crystallographic directions along which these perturbation are elongated. This approach provides a link between the crystallography, effective field on the sample scale and two-magnon scattering.