Voltage bias influence on the converse magnetoelectric effect of PZT/terfenol-D/PZT laminates

摘要

The converse magnetoelectric effect (CME) of a 2-mm-thick Pb(Zr_(0.52)Ti_(0.48))O_3 (PZT)/ Tb_(0.30)Dy_(0.7)Fe_2 (Terfenol-D)/PZT laminate subjected to an applied dc voltage bias has been investigated. Experimental data demonstrate that the CME coefficient αCME (B/V_(ac)is highly dependent on the applied voltage bias. In the present work, the voltage bias is shown to increase the magnitude of magnetostriction in the Terfenol-D, which results in an increase in the magnitude and range of piezomagnetic coefficient and α_(cme) values. It is shown that α_(CME) can range from a minimum of 0.4 G/V at a voltage bias of -200 V to a value of 1.65 G/V at a voltage bias of 700 V. This range represents a greater than 400% change in the α_(CME) at a fixed magnetic field bias, the largest change in α_(cme) due to voltage bias yet reported. The expanded range is primarily caused by giant shifts in the piezomagnetic coefficient and not by nonlinearities in the piezoelectric coefficient.