Enhanced magnetoimpedance and magnetodielectric effect in LaFeO3 – Organic paraffin wax hybrid nanocomposites

Abstract Room temperature magnetoimpedance and magnetodielectric effects for (100 − x)% LaFeO3 − x% organic paraffin wax (x = 0, 0.5, 1, 1.5%) hybrid nanocomposites have been investigated. The enhancement of magnetoimpedance (∼226%) and magnetodielectric (∼75%) effects at low frequency region are obtained for x = 0.5% nanocomposites for strain mediation of piezomagnetic materials. The observed current – voltage characteristics both in absence and presence of magnetic field at room temperature have corroborated with the enhanced effect. It is also showing electrical memory effect with electrical switching. The Nyquist plots have been fitted considering the parallel combination of resistance-constant phase element circuit. AC electrical studies reveal the conduction mechanism in the system controlling through the grain and grain boundaries of nanocomposites. The minimum grain and grain boundaries resistance are found for x = 0.5% nanocomposites. The electric modulus of these nanocomposites has been studied to separate the grain and grain boundaries contributions of the system. A phenomenological model has been demonstrated to explain the observed result considering the barrier width of paraffin wax layer across the grain boundaries of LaFeO3 nanoparticles. The observed transport behavior attributes the phenomenological model. The organic hybrid nanocomposites (x = 0.5%) may be worked as a resistance-capacitance-inductance circuit with voltage magnification.