Magnetization processes and optimal performance of magnetostrictive piezoelectric sensors

Abstract

We discuss the magnetization processes in sensors based on the superposition of a magneto- restrictive amorphous ribbon over a piezoelectric plate. These devices show an unusual behavior of the null condition in the response curves, which we have related theoretically and experimentally to the coercive force of the magnetic sample and to changes in the magnetic domain pattern for frequencies near the longitudinal piezoelectric resonance frequency.