Abstract
Granular phononic crystals have become an appealing platform for the study of a plethora of nonlinear wave phenomena in mechanical structures, and for applications such as vibration filters, tunable switches, and rectifiers. Here the authors reveal the strong benefit of using external magnetic fields to design mechanically unconstrained granular crystals. The resulting magnetogranular crystals are used for a detailed study of both longitudinal and transverse-rotational nonlinear waves. This system offers great freedom in designing complex waveguide geometries, where the interplay between geometry, wave polarization, and nonlinearity could be harnessed for advanced signal processing.
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