Effect of bias magnetic field on magnetoelectric characteristics in magnetostrictive/piezoelectric laminate composites

Abstract

The magnetoelectric (ME) characteristics for Terfenol-D/PZT laminate composite dependence on bias magnetic field is investigated. At low frequency, ME response is determined by the piezomagnetic coefficient d33,m and the elastic compliance sH33 of magnetostrictive material, d33,m and sH33 for Terfenol-D are inherently nonlinear and dependent on Hdc, leading to the influence of Hdc on low-frequency ME voltage coefficient. At resonance, the mechanical quality factor Qm dependences on Hdc results in the differences between the low-frequency and resonant ME voltage coefficient with Hdc. In terms of ΔE effect, the resonant frequency shift is derived with respect to the bias magnetic field. Considering the nonlinear effect of magnetostrictive material and Qm dependence on Hdc, it predicts the low-frequency and resonant ME voltage coefficients as a function of the dc bias magnetic field. A good agreement between the theoretical results and experimental data is obtained and it is found that ME characteristics dependence on Hdc are mainly influenced by the nonlinear effect of magnetostrictive material.