{"ID":22994683,"CreatedAt":"2026-09-17T04:01:24.020413181Z","UpdatedAt":"2026-09-17T04:01:24.020413181Z","DeletedAt":null,"paper_url":"https://arxiv.org/abs/2609.19112","arxiv_id":"2609.19112","title":"Divergence between long- and short-wavelength magnon damping in spinel ferrites","abstract":"The realization of practical, high-speed magnonic devices requires engineering magnetic materials with low dissipation over wide frequency ranges. While optical and microwave probes are used to infer the damping of low energy/long wavelength modes, the degree to which these $q\\sim0$ properties translate into higher-energy, finite-momentum modes remains an important open question. Here, we utilize a combination of ferromagnetic resonance (FMR) and resonant inelastic x-ray scattering on spinel ferrites Li$_{0.5}$Al$_x$Fe$_{2.5-x}$O$_4$ to probe magnons in both the short- and long-wavelength limits. We observe that aluminum substitution both markedly reduces the magnon bandwidth and drastically shortens the high-$q$ magnon lifetimes, in sharp contrast to the ultralow magnon damping inferred from FMR. These findings demonstrate a disparity between how non-magnetic substituents impact magnon damping in the long- and short-wavelength limits, providing a new perspective for assessing candidate materials for magnonic devices.","short_abstract":"The realization of practical, high-speed magnonic devices requires engineering magnetic materials with low dissipation over wide frequency ranges. While optical and microwave probes are used to infer the damping of low energy/long wavelength modes, the degree to which these $q\\sim0$ properties translate into higher-ene...","url_abs":"https://arxiv.org/abs/2609.19112","url_pdf":"https://arxiv.org/pdf/2609.19112v1","authors":"[\"Christopher T. Parzyck\",\"Octave Duros\",\"Hari Paudyal\",\"Noah M. Edmiston\",\"Katya Mikhailova\",\"Lerato Takana\",\"Daisy O'Mahoney\",\"Sauviz P. Alaei\",\"Daniel J. Foster\",\"Hiroki Suga\",\"Naoya Kurahashi\",\"Jun Miyawaki\",\"Michael E. Flatte\",\"Georgi Dakovski\",\"Yuri Suzuki\",\"Durga Paudyal\",\"Wei-Sheng Lee\"]","published":"2026-09-16T17:39:33Z","proceeding":"cond-mat.mtrl-sci","tasks":"[\"cond-mat.mtrl-sci\"]","methods":"[]","has_code":false}