Effect of preparation conditions on magnetoelectric properties of CoFe2O4-BaTiO3 magnetoelectric composites

The preparation conditions affect the microstructure of the samples and influence the coupling between the magnetostrictive and piezoelectric phases in magnetoelectric composites. In this work, the optimum conditions for preparing CoFe2O4 - BaTiO3 core - shell structure magnetoelectric composites were investigated. For pressing the composite powders, an optimum pressure of 6 tons/cm (2) was found. For the sintering process, to sinter the sample at 1250 degrees C for 4 h was best suited. By changing the preparation conditions, the magnetoelectric effect ( ME) coefficients of the studied samples may change 20 times, from 0.18 to 3.53 and 0.1 to 2.23 mV/cm Oe for longitudinal and transverse measurements, respectively. This shows the preparation conditions, which mean that the microstructure plays an important role for the magnetoelectric effect in CoFe2O4- BaTiO3 magnetoelectric composites. (c) 2007 Published by Elsevier B. V.