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

Karenowska, A. D.; Chumak, A. V.; Serga, A. A.; Gregg, J. F.; Hillebrands, B.
February 2010
Applied Physics Letters;Feb2010, Vol. 96 Issue 8, p082505
Academic Journal
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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