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

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

2009-12-10

arxiv.org/abs/0912.2029v3

Appl. Phys. Lett. 96, 082505 (2010)

Physics

Condensed Matter

Other Condensed Matter

4 pages, 3 figures

Scientific paper

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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