Coherent harmonic generation of magnons in spin textures

Guibin Lan, Kang-Yuan Liu, Zhenyu Wang, Fan Xia, Hongjun Xu, Tengyu Guo, Yu Zhang, Bin He, Jiahui Li, Caihua Wan, Gerrit E. W. Bauer, Peng Yan (), Gang-Qin Liu (), Xin-Yu Pan, Xiufeng Han and Guoqiang Yu ()
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Guibin Lan: Chinese Academy of Sciences
Kang-Yuan Liu: Chinese Academy of Sciences
Zhenyu Wang: University of Electronic Science and Technology of China
Fan Xia: Chinese Academy of Sciences
Hongjun Xu: Chinese Academy of Sciences
Tengyu Guo: Songshan Lake Materials Laboratory
Yu Zhang: Chinese Academy of Sciences
Bin He: Chinese Academy of Sciences
Jiahui Li: Chinese Academy of Sciences
Caihua Wan: Chinese Academy of Sciences
Gerrit E. W. Bauer: University of Chinese Academy of Sciences
Peng Yan: University of Electronic Science and Technology of China
Gang-Qin Liu: Chinese Academy of Sciences
Xin-Yu Pan: Chinese Academy of Sciences
Xiufeng Han: Chinese Academy of Sciences
Guoqiang Yu: Chinese Academy of Sciences

Nature Communications, 2025, vol. 16, issue 1, 1-7

Abstract: Abstract Harmonic generation, a notable non-linear phenomenon, has promising applications in information processing. For spin-waves in ferromagnetic materials, great progress has been made in the generation higher harmonics, however probing the coherence of these higher harmonics is challenging. Here, using in-situ diamond sensors, we study the coherent harmonic generation of spin waves in a soft ferromagnet. High-order resonance lines are generated via a microwave input and detected by nitrogen-vacancy (NV) centers in nanodiamonds. The phase coherence of the harmonic spin waves is verified by the Rabi oscillations of the NV electron spins. Numerical simulations indicate that the harmonic generation by microwaves below the ferromagnetic resonance frequency is associated with the nonlinear mixing of spin waves by magnetization structures at the film edge. Our finding of geometry-induced magnon harmonic generation constitutes a new way to generate magnon combs with coherent high-order harmonics and may pave the way for magnon-based information processing and quantum sensing applications.

Date: 2025
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DOI: 10.1038/s41467-025-56558-7

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