Piezoinductive Effect in Piezoelectric Disk With Electrodes Due to Combination of Electromagnetic Induction and Piezoelectricity

Abstract

The effects of mutual conversion of magnetic and electric fields are the basis for elaboration of magnetic field sensors and various electronic devices. Such effects include piezoinductive (PI) effects in piezoelectric-metal structures resulting from a combination of electromagnetic induction and piezoelectricity. In this letter, we study PI effects in a lead zirconate titanate disk with Ag-electrodes. The simple theory for PI effects in piezoelectric disks with electrodes is developed. It is shown experimentally that under the action of an alternating magnetic field <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">h</i> and permanent bias field <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">H</i> applied perpendicular to the disk plane, it generates an alternating voltage. At the frequency of radial acoustic resonance of the disk, the fields conversion efficiency up to 80 V/(Oe cm) was achieved. The efficiency of the fields conversion under PI effect in the disk structure depends linearly on the magnitude of alternating and permanent magnetic fields, which makes it possible to use the effect for elaboration of magnetic field sensors with linear characteristics.