Superior magnetodielectric properties of room temperature synthesized superparamagnetic cobalt ferrite - graphene oxide composite

Cobalt ferrite (CF) - Graphene oxide (GO) composite was synthesized using an in-situ chemical co-precipitation method at 27 degrees C. The combined effect of inorganic spinnel ferrite with an organic GO enhanced the magnetodielectric (MD) properties to a greater extend. A maximum dielectric constant of 1.12 x 10(8) and a capacitance of 37.27 x 10(-6) F at a frequency of 100 Hz with an applied magnetic field of 0.9 T, was achieved. The coupling mechanism between electric polarization and intrinsic magnetisation of the composite gave rise to MD effect. The incorporation of GO in CF, reduces the particle size of it, which resulted in the transition between the ferromagnetic to superparamagnetic nature. The high MD property of CF-GO enables its potential usage not only as a superstrate material in antenna miniaturization but also in flexible memory devices, electronic systems, spintronics and data storage. (C) 2018 Elsevier B.V. All rights reserved.