Magnetoelectric composite coupled by bonding material in energy trapping vibration for RF/microwave devices

Abstract

AbstractIn this work, the magnetoelectric (ME) coupling and electrical impedance of thickness extensional vibration mode in ME composite are investigated. The piezoelectric and magnetostrictive layers are adhered by epoxy, which acts as a central substrate layer, and the vibration is trapped by the electrodes located at the center of the piezoelectric material so as to generate energy trapping vibration mode. Parametric studies are performed to evaluate the influences of epoxy thickness and electrode dimensions on ME coupling and electrical impedance. It is found that the ME coupling increases to a peak value as the central epoxy thickness increases, and then it decreases because of the clamping effect. Therefore, an optimal thickness of the epoxy layer exits to achieve the maximum ME effect. In the converse ME effect, the electrical impedance decreases and then increases vs the thickness increase of the central substrate. In addition, the electrical impedance declines as the electrode radius increases. It is numerically demonstrated that good impedance matching can be achieved by properly design of the electrode dimensions.