Stress magnetization model for magnetostriction in multiferroic composite

Journal of Applied Physics Volume: 114 Issue: 5 Published: 2013

Schematic cross section of the material showing the matrix stress in the magnetic grain. The effect of the stress on the grain depends on the sign of the magnetostriction: if λ is positive, the grain will push the matrix (pressure, P); if λ is negative, the matrix will pressure the grain (tension, T).

Writers: A. J. Gualdi; F. L. Zabotto; D. Garcia; and A. J. A. de Oliveira

Keywords: Magnetostriction; Magnetic fields; Magnetic materials; Composite materials; Ferromagnetic materials

Abstract: An alternative to obtain multiferroic materials is the production of composite materials that combine ferroelectric and magnetic materials. In particular, the use of magnetostrictive materials as ferromagnetic phase in composites is very important because the mechanical stress applied in ferroelectric phase induces the appearance of magnetoelectric effect. In this work, we have proposed a generalized model for the magnetostriction dependence with the magnetization of the 0-3 type composite magnetoelectric materials. Including both piezomagnetic and stress dependence in the magnetostriction, a relevant improvement was reached as compared to the ordinary square magnetization model. Based on the Gibbs free energy expansion, the magnetostriction behavior of the composite (1−x)Pb(Mg1/3Nb2/3) − xPbTiO3 /CoFe2O4 at 300 K and 5 K is described. Furthermore, using the piezomagnetic correction, the magnetostriction data for the pure CoFe2O4 is fitted showing that this ferrite presents a relevant piezomagnetic

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DOI: 10.1063/1.4816785

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