Electromagnonic Crystals Based on Ferrite-Ferroelectric Thin-film Multilayers

Transmission characteristics of the periodic multiferroic heterostructure consisting of two ferrite films separated by a thin ferroelectric layer have been studied for the first time. This structure is characterized by a high microwave signal rejection of 25 dB due to the Bragg reflections. An influence of the various parameters on the behavior of bandgaps has been analyzed. A distinctive features of the proposed structure are the thin-film planar topology and dual tunability of the band-gap positions by both magnetic and electric fields. By analogy with known magnonic crystal, periodic multiferroic structures were named as electromagnonic crystals.