Magnons in α-Fe2O3 microdisks: from thermal to coherent excitation
Abstract
Hematite is a prototypical antiferromagnetic insulator for spintronic and magnonic applications, yet controlled studies of coherent magnons in thin films remain challenging due to strain sensitivity and spatial inhomogeneity. Here, we investigate magnon excitations in lithographically patterned hematite microdisks, and obtain reproducible magnon spectra from multiple individual microdisks. Brillouin light scattering reveals bulk-like field-dependent thermal magnon resonances with an ultralow effective damping parameter on the order of ~10-5. Coherent magnons are further excited using a stripline antenna adjacent to the microdisk, revealing a power-dependent frequency blue shift accompanied by a nonlinear evolution of the coherent response under strong microwave driving. Field-dependent analysis indicates a power-dependent increase of the effective magnetic anisotropy field, suggesting a tunable nonlinear response of antiferromagnetic magnons in laterally confined microdisks. These results establish patterned hematite thin films as a platform for exploring coherent and nonlinear antiferromagnetic magnon dynamics.
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BibTeX
@misc{wang2026magnons,
title = {{Magnons in α-Fe2O3 microdisks: from thermal to coherent excitation}},
author = {Jinlong Wang and Katharina Müller and Haishen Peng and Janine Gückelhorn and Wenjie Song and Lutong Sheng and Jilei Chen and Song Liu and Dapeng Yu and Stephan Geprägs and Matthias Althammer and Haiming Yu},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.37205},
eprint = {2610.37205},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.37205},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Magnons in α-Fe2O3 microdisks: from thermal to coherent excitation
AU - Jinlong Wang
AU - Katharina Müller
AU - Haishen Peng
AU - Janine Gückelhorn
AU - Wenjie Song
AU - Lutong Sheng
AU - Jilei Chen
AU - Song Liu
AU - Dapeng Yu
AU - Stephan Geprägs
AU - Matthias Althammer
AU - Haiming Yu
PY - 2026
DA - 2026/10/27
PB - arXiv
DO - 10.48550/arxiv.2610.37205
UR - https://arxiv.org/abs/2610.37205
AB - Hematite is a prototypical antiferromagnetic insulator for spintronic and magnonic applications, yet controlled studies of coherent magnons in thin films remain challenging due to strain sensitivity and spatial inhomogeneity. Here, we investigate magnon excitations in lithographically patterned hematite microdisks, and obtain reproducible magnon spectra from multiple individual microdisks. Brillouin light scattering reveals bulk-like field-dependent thermal magnon resonances with an ultralow effective damping parameter on the order of ~10-5. Coherent magnons are further excited using a stripline antenna adjacent to the microdisk, revealing a power-dependent frequency blue shift accompanied by a nonlinear evolution of the coherent response under strong microwave driving. Field-dependent analysis indicates a power-dependent increase of the effective magnetic anisotropy field, suggesting a tunable nonlinear response of antiferromagnetic magnons in laterally confined microdisks. These results establish patterned hematite thin films as a platform for exploring coherent and nonlinear antiferromagnetic magnon dynamics.
ER -