Coupling of electromagnetic waves and superlattice vibrations in a piezomagnetic superlattice: Creation of a polariton through the piezomagnetic effect

We studied the propagation of an electromagnetic (EM) wave in a piezomagnetic superlattice with piezomagnetic coefficient being modulated. Because of the piezomagnetic effect, the coupling between the EM wave and vibration of superlattice can be established, resulting in the creation of a type of magnetic polariton that does not exist in ordinary magnetic material. At some resonance frequencies, the abnormality of dispersion of permeability introduces negative value and piezomagnetic superlattice can make a kind of negative permeability material.