Spin-wave frequency multiplication by magnetic vortex cores

• URL: http://arxiv.org/abs/2412.13784v1
• Date: Wed, 18 Dec 2024 12:27:41 GMT
• Title: Spin-wave frequency multiplication by magnetic vortex cores
• Authors: Cheng-Jie Wang, Yuxin Li, Zhe Ding, Pengfei Wang, Fazhan Shi, Jiangfeng Du,
• Abstract summary: We study the magnetization dynamics of magnetic vortices formed in micron-sized disks and squares via wide-field magnetic imaging. We found the occurrence of coherent spin-wave harmonics arising from the gyration of vortex cores driven by microwave fields. This phenomenon reveals a universal mechanism where the periodical motion of delta function-like objects such as vortex cores gives rise to a frequency comb.
• Score: 32.04742444135443
• License:
• Abstract: Frequency multiplication involves generating harmonics from an input frequency, a technique particularly useful for integrating spin-wave devices operating at different frequencies. While topological magnetic textures offer distinct advantages in spin-wave applications, frequency multiplication has not yet been observed in these structures. Here, we study the magnetization dynamics of magnetic vortices formed in micron-sized disks and squares via wide-field magnetic imaging. We found the occurrence of coherent spin-wave harmonics arising from the gyration of vortex cores driven by microwave fields. This phenomenon reveals a universal mechanism where the periodical motion of delta function-like objects such as vortex cores gives rise to a frequency comb. Our results pave the way for creating nanoscale, tunable spin-based frequency multipliers and open new possibilities for frequency comb generation in a variety of systems.

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