Twisted magnon frequency combs in ferromagnetic nanorings
Abstract
We systematically investigate the emergence of twisted magnon frequency combs (tMFCs) and their higher-order modes arising from strong nonlinear coupling between vortex-core gyration and azimuthal spin-wave modes in ferromagnetic nanorings. The comb spacing is set by the gyrotropic frequency, which is controlled by both the size of the central hole and external magnetic fields. Remarkably, for the larger hole diameter (50 nm), an additional magnon mode emerges, leading to additional tMFC families. We also demonstrate that the selection rules still hold for different nanorings. In addition, the external in-plane magnetic field provides an effective means to tune the tMFC, while the response strongly depends on the nanostructure geometry. The nanodisk shows an approximately symmetric response under field reversal, whereas the response of nanorings depends strongly on the size of the central hole. For a small hole diameter (5 nm), the low-field response becomes asymmetric, and the tMFC spacing increases with field magnitude over the higher field branches. A larger hole diameter (50 nm) raises the gyrotropic frequency, yielding a sparser sideband structure near the drive frequency. Our results show that ferromagnetic nanorings support geometrically and magnetically tunable tMFCs.
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BibTeX
@misc{xuejuan2026twisted,
title = {{Twisted magnon frequency combs in ferromagnetic nanorings}},
author = {Liu Xuejuan and Zheng Xingen and Li Zhengyi and Zhang Zhizhi and Li Xiaoguang and Sun Hai-Peng and Li Hui and Zhou Cangtao},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2608.19647},
eprint = {2608.19647},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.19647},
}
RIS
TY - UNPB
TI - Twisted magnon frequency combs in ferromagnetic nanorings
AU - Liu Xuejuan
AU - Zheng Xingen
AU - Li Zhengyi
AU - Zhang Zhizhi
AU - Li Xiaoguang
AU - Sun Hai-Peng
AU - Li Hui
AU - Zhou Cangtao
PY - 2026
DA - 2026/09/30
PB - arXiv
DO - 10.48550/arxiv.2608.19647
UR - https://arxiv.org/abs/2608.19647
AB - We systematically investigate the emergence of twisted magnon frequency combs (tMFCs) and their higher-order modes arising from strong nonlinear coupling between vortex-core gyration and azimuthal spin-wave modes in ferromagnetic nanorings. The comb spacing is set by the gyrotropic frequency, which is controlled by both the size of the central hole and external magnetic fields. Remarkably, for the larger hole diameter (50 nm), an additional magnon mode emerges, leading to additional tMFC families. We also demonstrate that the selection rules still hold for different nanorings. In addition, the external in-plane magnetic field provides an effective means to tune the tMFC, while the response strongly depends on the nanostructure geometry. The nanodisk shows an approximately symmetric response under field reversal, whereas the response of nanorings depends strongly on the size of the central hole. For a small hole diameter (5 nm), the low-field response becomes asymmetric, and the tMFC spacing increases with field magnitude over the higher field branches. A larger hole diameter (50 nm) raises the gyrotropic frequency, yielding a sparser sideband structure near the drive frequency. Our results show that ferromagnetic nanorings support geometrically and magnetically tunable tMFCs.
ER -