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∼0 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 Li0.5AlxFe2.5−xO4 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.
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BibTeX
@misc{parzyck2026divergence,
title = {{Divergence between long- and short-wavelength magnon damping in spinel ferrites}},
author = {Christopher T. Parzyck and Octave Duros and Hari Paudyal and Noah M. Edmiston and Katya Mikhailova and Lerato Takana and Daisy O'Mahoney and Sauviz P. Alaei and Daniel J. Foster and Hiroki Suga and Naoya Kurahashi and Jun Miyawaki and Michael E. Flatte and Georgi Dakovski and Yuri Suzuki and Durga Paudyal and Wei-Sheng Lee},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.19112},
eprint = {2609.19112},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.19112},
note = {CC BY-NC-SA 4.0},
}
RIS
TY - UNPB
TI - Divergence between long- and short-wavelength magnon damping in spinel ferrites
AU - Christopher T. Parzyck
AU - Octave Duros
AU - Hari Paudyal
AU - Noah M. Edmiston
AU - Katya Mikhailova
AU - Lerato Takana
AU - Daisy O'Mahoney
AU - Sauviz P. Alaei
AU - Daniel J. Foster
AU - Hiroki Suga
AU - Naoya Kurahashi
AU - Jun Miyawaki
AU - Michael E. Flatte
AU - Georgi Dakovski
AU - Yuri Suzuki
AU - Durga Paudyal
AU - Wei-Sheng Lee
PY - 2026
DA - 2026/09/16
PB - arXiv
DO - 10.48550/arxiv.2609.19112
UR - https://arxiv.org/abs/2609.19112
AB - 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∼0 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_0.5Al_xFe_2.5−xO_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.
ER -