Abstract
The paper is devoted to the study of mechanism of internal magnetic fields occurrence in the magnetostrictive-piezoelectric gradient structure CoFe2O4/Ni/BaTiO3. The insertions of CoFe2O4 and Ni in this gradient structure in the matrix BaTiO3 is located. The connectivity type of this composite is 0-3 and a modified model of the cell in the form of a parallelepiped is used. This parallelepiped consists of two cubic cells of BaTiO3 matrix. One cubic cell contains of CoFe2O4 insertion and another cell contains of Ni one. The corresponding magnetic circuit by using the magnetostatics equations was considered. Internal magnetic fields which arise in sublattices of CoFe2O4 and Ni, taking into account the known parameters of their magnetization curves were found and equal of 860 Oe and of 50 Oe for CoFe2O4 and Ni, respectively. Further, the pseudo-piezomagnetic constants that correspond to the resulting internal magnetic fields were found by using of the existing dependencies of the pseudo-piezomagnetic coefficients of CoFe2O4 and Ni on the bias magnetic field. The effective parameters of the structure in the form of a parallelepiped was found.
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