Development of BiFeO3/MnFe2O4 ferrite nanocomposite for enhanced magnetic and electrical properties
Herein we report the development of novel multiferroic nanocomposites for their enhanced magnetic and electrical properties by employing simple cost-effective chemical process at low temperatures. Novel perovskite-mixed spinel nanocomposites of (1-x)BiFeO3/xMnFe2O4 where x = 0.1 - 0.5 have been prepared by a sol - gel auto - combustion technique. Calcination temperature was optimized and the phase formation of BiFeO3/MnFe2O4 nanocomposites were confirmed from X-ray diffraction pattern for the samples calcinated at 500 ºC for 2 h. The grain sizes have been found to vary from 60 to 90 nm. Vibrational modes of the prepared nanocomposites were studied using Raman spectroscopy and FESEM and EDX were used to investigate the microstructural and composition analysis respectively. The magnetic properties seemed to have a strong dependence on the concentration of spinel ferrite in the composite system. Saturation magnetization and coercivity exhibit an increase with increase in MnFe2O4. The electrical properties from solid state impedance analysis confirm the non-Debye characteristics and the maximum activation energy occurs for the 0.5BiFeO3/0.5MnFe2O4 nanocomposite having a value of 0.931 eV. Dispersion in dielectric constant and dielectric loss in the low frequency range has also been determined, which decreases with increase in temperature at lower ac frequencies.