Comprehensive investigation on direct and converse magnetoelectric effects in longitudinally magnetized and polarized laminate composites by equivalent circuit and experiments

Abstract

Asymmetrical equivalent circuits, making φmH as magnetic part for the direct magnetoelectric (DME) effect of magnetoelectric laminate composites of longitudinally magnetized and poled (L–L) mode, have been reported recently. In this paper, we developed a symmetrical magnetic–mechanical–electric equivalent circuit to study both the DME and converse magnetoelectric (CME) effects equivalently, predicting the DME and CME coefficients near the resonance frequency. The theoretical values are in good agreement with the corresponding experiments. The L–L mode laminate composites have higher DME voltage coefficient and CME coefficient in comparison with the longitudinally magnetized and transversely poled (L–T) mode. In particular, its voltage coefficient is almost ten times as large as that of the L–T mode composite. The results are significant for the fabrication of magnetoelectric transducer, energy capture device, electronically controlled magnetometers and magnetic field sensors.