Effect of adjustable bias voltage on magnetoelectric properties of piezoelectric/magnetostrictive laminate transducer

The magnetoelectric (ME) properties of PZT5/Terfenol-D/PZT8 laminate transducer structure are analyzed and detected for adjusting the bias voltage across PZT5 plate. A control method of the first-order resonant frequency for a magnetostrictive/piezoelectric laminate magnetoelectric transducer structure is proposed. The resonant frequency of the magnetoelectric laminated structure can be adjusted by changing the bias voltage across PZT5 plate. The relationships between the control voltage and the resonant frequencies are analyzed. The resonant frequency of the laminate structure is almost a linear function of the applied dc bias voltage at a small strain. The magnetoelectric coefficient is hardly related to the control voltage. The experimental results verify the theoretical analyses. For a control voltage from -170V to +170V, the adjusted maximum of the resonant frequency is 1 kHz. The ratio of the adjusted resonant frequency to the bias control voltage is 2.94Hz/V.