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
SEE PDF: Stress magnetization model for magnetostriction in multiferroic composite
DOI: 10.1063/1.4816785
