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arXiv · 0912.2029

Magnonic crystal based forced dominant wavenumber selection in a spin-wave active ring

A. D. Karenowska·A. V. Chumak·A. A. Serga·J. F. Gregg·B. Hillebrands
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Abstract

Spontaneous excitation of the dominant mode in a spin-wave active ring -- a self-exciting positive-feedback system incorporating a spin-wave transmission structure -- occurs at a certain threshold value of external gain. In general, the wavenumber of the dominant mode is extremely sensitive to the properties and environment of the spin-wave transmission medium, and is almost impossible to predict. In this letter, we report on a backward volume magnetostatic spin-wave active ring system incorporating a magnonic crystal. When mode enhancement conditions -- readily predicted by a theoretical model -- are satisfied, the ring geometry permits highly robust and consistent forced dominant wavenumber selection.

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A. D. Karenowska, A. V. Chumak, A. A. Serga, J. F. Gregg, B. Hillebrands. 2010-04-11. Magnonic crystal based forced dominant wavenumber selection in a spin-wave active ring. https://doi.org/10.1063/1.3318258

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