Resumo

HERNANDEZ CABANAS, Joanka et al. Magneto-electro-elastic layered composite with variations in the magnetization orientation. Nova scientia [online]. 2010, vol.2, n.4, pp.58-76. ISSN 2007-0705.

The effect of the polarization orientation in the piezocomposites global characteristic has been studied and published. This work is inspired in this idea. In the present work, the effects of the magnetization orientation related to the effective properties in piezoelectric/piezomagnetic composite were studied. Using the asymptotic homogenization method, the effective coefficients of periodic magneto-electro-elastic layered composite with triclinic constituents or other type of symmetry can be obtained in a matrix form. By using this matrix, a two-layered composite formed by BaTiO₃ and CoFe₂O₄ is studied taking into account the influence of the polarization orientation on their effective properties. The piezoelectric polarization direction and discontinuity direction of layers are the same, while the ferrite magnetization direction form a variable angle with respect to the discontinuity direction. Due to magnetization rotation, new effective constants appear in this composite, and some of those were not present in any independent phases. Some effective figures of merit were computed as functions of the angle θ between magnetization and polarization. The maximum value of two figures of merit are not reached for θ = 0, and these are related with magnetoelectric and piezomagnetic effect.

Palavras-chave : composite materials; magnetoelectric effect; asymptotic homogenization; magnetization orientation.