Magnetic Field Induced Dielectric and Ferroelectric Behaviors in Pb(Zr_(0.5)Ti_(0.5))O_3/CoFe_2O_4 0-3 Thick Composite Films

摘要

Pb(Zr_(0.5)Ti_(0.5))O_3/CoFe_2O_4 0-3 thick composite films with various phase composition ratios were deposited on LaNiOs-coated silicon substrates by chemical solution deposition. X-ray diffraction confirmed the coexistence of Pb(Zr_(0.5)Ti_(0.5))O_3 and CoFe_2O_4 without other impurity phases. Scanning electron microscope revealed that these composite films are crack-free and CoFe_2O_4 nanoparticles are well dispersed in Pb(Zr_(0.5)Ti_(0.5))O_3 matrix. Our data indicate that the magnetic, dielectric and ferroelectric properties are strongly dependent on the phase composition ratios. Variation in dielectric constant induced by an applied magnetic field demonstrates the expected magnetodielectric effect. The great effect of magnetic field on the ferroelectric loops supports the desired magnetoelectric coupling between Pb(Zr_(0.5)Ti_(0.5))O_3 and CoFe_2O_4 phases.