In the last years the fabrication of multifunctional composite materials like the mixture of piezoelectric polymers with magnetic/magnetostrictive nanoparticles to give as result magnetoelectric (ME) composites has received great effort [1]. P(VDF-TrFE), in the poled ferroelectric phase, exhibits one of the highest piezoelectric responses among polymer materials over a wide range of temperature depending on its composition. Among ferrites, the ferrimagnetic material barium ferrite (BaFeO) shows particular magnetic properties as high coercive force and hysteresis losses. Despite its very low magnetostriction (9 ppm), Barium ferrite has very high magnetocrystalline anisotropy in the low-symmetry hexagonal magnetoplumbite crystal structure with hexagonal unit cell. Although barium ferrite particles have the shape of thin hexagonal platelets, the easy direction of magnetization remains along the c axis, which is perpendicular to the plates.
展开▼
