Linear and quadratic magnetoelectric effect in CNMFO:PZT magnetoelectric composite

Dynamic magnetoelectric voltage measurements of 30 % Co0.7−xNixMn0.3Fe2O4:70 % Pb(Zr0.52Ti0.48)O3 composites with x = 0.00, 0.05, 0.10, 0.15 synthesized by ceramic method were carried out by linear and quadratic method. Maximum linear magnetoelectric coefficient (α) of 14.7 mv Oe−1 cm−1 and maximum quadratic coefficient (β) of 2.26 × 10−4 mv Oe−2 cm−1 were obtained for composition with x = 0.05. Maximum values of α and β for composition with x = 0.05 may be due to more connectivity between grains than in other compositions observed from scanning electron micrographs. Higher values of dielectric constant and ac conductivity for particular composition could also be possible reasons for maximum magnetoelectric coefficients. Smaller dielectric loss at higher frequencies was observed for the same composition which may result into less leakage of charges consequently increasing the resultant magnetoelectric coefficients.