Observation of direct and indirect magnetoelectricity in lead free ferroelectric (Na0.5Bi0.5TiO3)-magnetostrictive (CoFe2O4) particulate composite

A particulate composite consisting of 65 mol.% Na0.5Bi0.5TiO3 and 35 mol.% CoFe2O4 was synthesized, and it's structure, microstructure, ferroelectric, magnetostrictive, magnetic, and direct/indirect magnetoelectric properties were studied. The composite showed different magnetization behaviour under electrically poled and un-poled conditions. The percentage change in magnetization as a result of poling is approximately -15% at 500 Oe magnetic field. Magnetostriction measurements displayed a value of lambda(11) = -57 x 10(-6) and piezomagnetic coefficient delta lambda(11)/delta H = 0.022 x 10(-6) kOe(-1) at 2.2kOe for the composite. The maximum magnetoelectric output varied from 1350 mV/cm to 2000 mV/cm with change in the electrical poling conditions. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4745840]