Optimum relationship between the thicknesses of the layers for asymmetric three-layered magnetostrictive-piezoelectric structure

The current study examines the magnetoelectric effect in the three-layer magnetostrictive- piezoelectric magnetic-piezoelectric-magnetic material structure with opposite signs of magnetostriction of magnetic materials caused by flexural strain. The study demonstrates that the efficiency of the magnetoelectric transformation of the structure depends on the ratio of the thickness of the layers of magnetic and piezoelectric materials. The maximum conversion efficiency is achieved when the neutral line coincides with the interface between the piezoelectric and the magnetic materials. The research obtains the ratio between the layer thicknesses to achieve the maximum effect value. It is shown that the magnetoelectric coefficient can change the sign depending on the ratio of the thickness of the layers.