Inorganic-organic hybrid nanocomposites: Magnetoelectric coupling, dielectric and AC electrical response

Abstract

Abstract Room temperature magnetoelectric coupling, magnetic field dependent dielectric and ac electrical properties of xLa0.7Sr0.3MnO3 – (1\u202f−\u202fx) Poly(vinylidene fluoride) (x\u202f=\u202f0.5, 0.6 and 0.7) nanocomposites have been investigated. The magnetoelectric voltage coefficients are found to ∼0.25 and ∼0.16\u202fmV/cmOe for transverse and longitudinal configurations. Dielectric constants for all the compositions are increased with increase in magnetic field. Magnetodielectric value is estimated to ∼16% due to the magnetostriction property of the samples. The fitted value of Nyquist plots reveals the dominant role of the grain boundaries of La0.7Sr0.3MnO3 nanoparticles and modified grain boundaries due to Poly(vinylidene fluoride) in the samples. With the application of magnetic field the relaxation frequencies are shifted towards the higher frequency region attributing to the magnetic field dependent relaxation process in the system.