Abstract
Herein we report the development of a core-shell-like CoFe2O4−BaTiO3 multiferroic nanocomposite (1:1 wt ratio) for their enhanced magnetoelectric coupling and energy storage density by the wet chemical route. Rietveld refinement analysis of the XRD pattern verified the formation of cubic spinel (CoFe2O4) and tetragonal perovskite (BaTiO3) structures. Whereas the SEM and EDX analysis confirmed the formation of core-shell-like morphology in the composite. The temperature dependence of dielectric permittivity showed two distinct peaks corresponding to the constituent phases´ structural phase transitions. However, the frequency dependence of low-temperature peak revealed an abnormal relaxor-type behavior, which is elucidated due to intrinsic structural defects that might cause alteration in the octahedron arrangement in BaTiO3. Impedance spectroscopy analysis was utilized to calculate the activation energy (Ea) of respective phases, which was found to be>1 eV that confirms the dominance of doubly ionized oxygen vacancies in governing the thermally stimulated conduction process. It was found that the prepared composite exhibited high dielectric permittivity (~2700) and moderate values of saturation magnetization (20 emu/g) and polarization (6.2 μC/cm2) along with low remnant polarization (3 μC/cm2) at room temperature. Moreover, we also observed enhanced energy storage efficiency (67%) and magnetoelectric coefficient (0.18 V/cm Oe), which are explained due to strong interfacial coupling and reduced leakage current, making this composition promising for multifunctional device applications.
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