Strong magnetoelectric coupling in CoFe2O4-BaTiO3 composites prepared by molten-salt synthesis method

Magnetoelectric nano-composites (1-x)CoFe2O4+(x)BaTiO3 with x varies as 0, 0.5,0.65 and 1.0 in molar ratio were prepared by molten-salt synthesis method. The structural analysis carried out by X-ray diffraction (XRD) technique has confirmed that both phases are present in all the nano-composites powders and ceramic composites. The TEM images show that the nano-particle crystallite size is about 50-80 nm, which is consistent to the result calculated by XRD. The dielectric constant was studied as a function of frequency for ceramic composites sintered by using those nano-composite powders. The saturation magnetization (Ms) and remnant polarization (Pr) were calculated from the magnetic hysteresis loop respectively. And a large ME coefficient of about 17.04 mV cm(-1) Oe(-1) was and electric hysteresis loop, 0.5CoFe(2)O(4) + 0.58BaTiO(3) ME composite under the ac superimposed magnetic signal with observed for 20 kHz frequency by using the lock-in technique. (C) 2009 Published by Elsevier B.V.