Abstract
Magnetoelectric (ME) composites exhibit the magnetoelectric effect, which is a coupling phenomenon resulting from the interaction between the magnetostrictive and piezoelectric phases. This makes ME composites useful as multifunctional devices in a variety of applications. In this work, a press-fit epoxy-free nested ring structured ME composite has been fabricated, in which nickel and FeNi form the magnetostrictive phase and PZT-5A constitutes the piezoelectric phase. To conduct a comparative study, epoxy bonded conventional bilayered and trilayered ME composites of the same material constituents and similar volume fractions have also been made. Magnetostriction measurements are done on individual magnetostrictive materials at varying temperatures in longitudinal and transverse directions. Measurement of the ME coefficient is done on all the prepared composites and their relative response at elevated temperatures is presented. Self-biased behavior of the ME composites resulting out of the applied prestress is also captured. A 2D hysteretic model including the temperature and prestress effects that can capture the behavior of epoxy-free ring composites has also been formulated. The results from the model are in agreement with the experimental results at all the temperatures. The obtained experimental results highlight the suitability of epoxy-free ring composites to be used in high temperature microdevices.
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