Structural, Magnetic and Dielectric Study of Bi2Fe4O9/CoFe2O4 Composite

Abstract

Composite Bi2Fe4O9(90)/CoFe2O4(10) was synthesized using the sol-gel auto combustion method. The structural, magnetic, and dielectric characteristics were studied in the present work. The crystallite size of composite ~ 60 nm was calculated from the Rietveld Refinement analysis of room temperature X-ray diffraction (XRD) patterns. Surface morphology depicted the inhomogeneity in grain dispersion with 0.7μm-sized grains on average. The field-dependent magnetization curve at room temperature (RT) showed weak ferromagnetism with a saturation value of ~ 8 emu/g by applying an external field ±15 Oe. Temperature dependence dielectric study at constant frequencies showed the transition near 300 K, revealing the presence of MD coupling. MD coupling provides an extra degree of versatility in multifunctional device usage and creating innovative sensors, actuators, and memory devices.