A dual-peak phenomenon of magnetoelectric coupling in laminated Terfenol-D/PZT/Terfenol-Dcomposites

Abstract

Magnetoelectric (ME) composite materials find many applications due to their high magnetoelectric (ME)coefficient (αME) at room temperature. A dual-peak phenomenon is reported in the curves of the magnetoelectric coefficient (αME) versus the staticmagnetic field (HS) for Terfenol-D/PZT/Terfenol-D tri-layered composites of rectangular shape.The first peak corresponds to the maximum of the piezomagnetic coefficientd33, m of the Terfenol-D plate, and the second is caused by the resonance of the laminateunder the applied alternating magnetic field. The position of the first peak in theαME versusHS curve shifts slightly as the frequency increases. The positionof the second peak, however, moves considerably toward higherHS values as the frequency increases. An analysis based on the equivalentcircuit method is proposed, which incorporates the constitutive model andthe change in Young’s modulus with the applied static magnetic field (ΔE effect) for Terfenol-D. The theoretical prediction agrees well with the experimentalobservations. This finding is of importance for both the basic understanding of the MEcomposites and for device applications such as detection of magnetic materials.