Magnonic crystal based forced dominant wavenumber selection in a spin-wave active ring
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.
- Publication:
-
Applied Physics Letters
- Pub Date:
- February 2010
- DOI:
- 10.1063/1.3318258
- arXiv:
- arXiv:0912.2029
- Bibcode:
- 2010ApPhL..96h2505K
- Keywords:
-
- magnetic structure;
- magnetostatics;
- spin waves;
- 75.30.Ds;
- 75.25.-j;
- 41.20.Gz;
- Spin waves;
- Magnetostatics;
- magnetic shielding magnetic induction boundary-value problems;
- Condensed Matter - Other Condensed Matter
- E-Print:
- 4 pages, 3 figures