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Composite Magnetoelectrics by N Sun, S Priya, G Srinivasan

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3

Layered multiferroic composites

G. Srinivasan     Oakland University, Rochester, MI, USA

Abstract

In a composite consisting of magnetostrictive and piezoelectric phases, the magnetoelectric (ME) effect is the result of a “product-property,” that is the mechanical deformation due to magnetostriction results in a dielectric polarization due to the piezoelectric effect. The early works on ME composites dealt with CoFe2O4 and BaTiO3 and were prepared by two methods: sintering and unidirectional solidification of eutectic melts. Both types of composites developed microcracks due to thermal expansion mismatch and yielded ME coefficients that were a factor 40–60 smaller than calculated values. Possible causes include (1) microcracks, defects, and impurities ...

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