Multiferroic and magnetodielectric properties of Co0.5Ni0.5Fe2O4 - BaTiO3 composites

Multiferroics are the materials possessing two or more ferroic orderings viz. ferroelectric, ferroelastic, ferromagnetic or ferrotoroidic. Magnetoelectric coupling requires manipulation of electrical ordering via magnetic field or vice versa. In this work, the magnetoelectric composites of (1-x)Co0.5Ni0.5Fe2O4-xBaTiO3 (CNFO-BT) (x=0.3 and 0.5) were prepared employing solid state reaction method. The structural measurement of CNFO-BT composites employing X-ray diffraction technique confirm single phased nature of cubic and tetragonal phase with space group Fd3m and P4mm for CNFO and BT phases respectively. The magnetodielectric change exhibit robust non-zero coupling even at magnetic field of 6 kOe. The ferroelectric measurements show improvement in CNFO-BT composites with increasing amount of BT due to enhanced electrical properties. The magnetic hysteresis curves reveal strong ferromagnetic behavior in all composites. These measurements establish the multiferroic and magnetoelectric nature of CNFO-BT composites.