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Divergence between long- and short-wavelength magnon damping in spinel ferrites
Preprint   Open access

Divergence between long- and short-wavelength magnon damping in spinel ferrites

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, …
arXiv
arXiv
09/16/2026
DOI: 10.48550/arxiv.2609.19112
url
https://doi.org/10.48550/arxiv.2609.19112View
Preprint (Author's original) This preprint has not been evaluated by subject experts through peer review. Preprints may undergo extensive changes and/or become peer-reviewed journal articles. Open Access

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 theseq∼0properties 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 ₄to 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- qmagnon 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.
 Physics - Materials Science

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