We present an analytical framework capable of describing spin-waves dynamic in magnetic hetero-structures composed of a pair of exchange-decoupled magnetic layers separated by a nonmagnetic spacer, focusing in particular on garnet-based multilayers. The model captures the formation of collective spin-wave modes, namely symmetric and antisymmetric, arising from dipolar coupling and provides direct access to the dispersion relation of the system and consequent interference phenomena. This formalism establishes a versatile theoretical tool for the predictive design of dipolarly coupled magnonic devices, providing access to their eigenfrequencies and mode shapes.
@article{arxiv.2605.08667,
title = {Reciprocal Space Approach to Dipolarly Coupled Magnetic Hetero-Structures},
author = {A. Del Giacco and L. Menna and M. J. Gross and O. Wojewoda and V. Levati and M. Urbanek and S. Kurdi and E. Albisetti and D. Petti and C. A. Ross},
journal= {arXiv preprint arXiv:2605.08667},
year = {2026}
}