Abstract
Herein, MnFe2O4 (MFO)-Graphene Oxide (GO) composites have been synthesized by ultrasonication method with a variation of GO content from 0 to 40 wt%. The structural tests (XRD, FTIR, HRTEM, EDX, and Raman spectroscopy) prove that the composites have high purity, contain a variety of functional groups, and have phonon modes of both GO and MFO phases. The highest value of dielectric constant (ε′ = 1823 at 100 Hz, ε′ = 122 at 1 MHz) with low dielectric loss (tanδ = 4.83 at 100 Hz) is obtained for composite with 40 wt% of GO content. The composite having 20 wt% of GO content has the lowest leakage current density (J = 4.99 × 10−7 A/cm2 at an applied electric field of 25 V/cm). The impedance study indicates the enhancement in charge transfer resistance in composites with the introduction of GO. The saturation magnetization (Ms) drops gradually from Ms = 38.28 emu/g for 0 wt% of GO to Ms = 24.10 emu/g for 30 wt% of GO and then rises to Ms = 25.64 emu/g at 40 wt% of GO content. The studied composites show the characteristics of a soft magnetic state with small values of coercivity (Hc ≤ 50 Oe). The findings reveal the exciting potential of synthesized composites for energy storage and magnetically tunable electronic devices.
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