Resonant giant magnetoelectric effect of piezoelectric/magnet composites

The frequency dependence of giant magnetoelectric (ME) effect origining from the coupling of piezoelectricity and magnetic torque in piezo-bimorph/magnet composites has been investigated. The ME effect was dramatically enhanced when the ME composite operates around the first bending mode resonant frequency. To evaluate and predict the ME performance at different frequencies, we´ve theoretically derived the ME voltage equation for the Piezo-bimorph/magnet device, basing on the piezoelectricity principle and mechanical vibration theory. The experiments also confirmed our prediction. This research has provided guides for scientists/engineers to constructed low cost and passive ME device with giant ME effect.