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We report on the design and operation of a 1D magneto-granular phononiccrystal composed of a chain of steel spherical beads on top of permanentmagnets. The magnetic field of the permanent magnets induces forces in thegranular structure. By changing its strength, we can tune the dynamic responseof the granular structure. We present experimental results with evidence ofcoupled transversal-rotational modes, and zero group velocities modes. Theseobservations are well supported by a proposed model taking into account themechanical coupling between the beads and the magnets by linear stiffnesses andincluding all degrees of freedom in translations and rotations.

Transversal-rotational and zero group velocity modes in tunable magneto-granular phononic crystals