Electromechanical coefficients of magnetoelectric PZT-CoFe2O4 composite

The magnetoelectric property of composite materials consisting of piezoelec tric and piezomagnetic constituents are of interest since the stresses indu ced in them on application of an external magnetic field are converted into electrical signals. The electrical output is primarily due to electromagne tic coupling between the two participating phases. The present paper deals with the evaluation of the electromechanical coupling in the magnetoelectri c composite consisting of 50% lead zirconate titanate (Pb0.96Sr0.04Ti0.47Zr 0.53O3) and 50% CoFe2O4, the composition having maximum magnetoelectric con version efficiency. A sum rule is proposed to calculate the electromechanic al coupling coefficient and the results are correlated with the experimenta l data.