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arXiv · 2608.16065

Helical Magnon Frequency Comb in Synthetic Antiferromagnetic Skyrmion Lattices

Liu Xuejuan·Zheng Xingen·Li Zhixiong·Li Xiaoguang·Zhou Cangtao·Li Hui·Sun Haipeng·Yan Peng
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Abstract

Synthetic antiferromagnetic skyrmion lattices (SAF-SkLs), consisting of two ferromagnetic SkLs coupled antiferromagnetically with compensated magnetization, provide a promising platform for robust nonlinear magnonics. Here, we investigate helical magnon frequency comb (HMFC) generation in a SAF-SkL by combining analytical modeling with micromagnetic simulations. We show that nonlinear coupling between helical magnon edge states and the skyrmion gyration produces frequency combs with pronounced edge localization. The HMFC exhibits strong enhancement exclusively when the driving frequency lies within the helical edge-state band, whereas the interior response remains negligible. This frequency selectivity confirms the essential role of helical edge modes in localized nonlinear frequency conversion. We further demonstrate that the interlayer antiferromagnetic coupling reconstructs the magnon spectrum, thereby tuning the comb spacing and the number of comb teeth while also redistributing modal energy. Our results establish SAF-SkLs as a tunable platform for edge-localized HMFCs and suggest a route toward robust coherent magnonic signal processing.

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Liu Xuejuan, Zheng Xingen, Li Zhixiong, Li Xiaoguang, Zhou Cangtao, Li Hui, Sun Haipeng, Yan Peng. 2026-08-17. Helical Magnon Frequency Comb in Synthetic Antiferromagnetic Skyrmion Lattices. https://arxiv.org/abs/2608.16065

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