Abstract
Abstract Magnetoelectric (ME) nanocomposites of xNiFe2O4–(1−x)BiFeO3 (x = 0.1, 0.2, 0.3, 0.4) have been prepared by chemical solution method. The samples have been calcined at various temperatures ranging from 500 to 700 °C and X-ray diffraction analysis showed phase formation of xNiFe2O4–(1−x)BiFeO3 nanocomposites calcined at 500 °C. The effect of annealing temperature on structural and magnetic properties was studied. TEM shows the formation of powders of nano order size and the average crystal size was found to be around 30–70 nm. Variation of dielectric constant and dielectric loss with frequency showed dispersion in the low frequency range and an anomaly in the temperature variation of dielectric constant is an evidence of presence of magnetoelectric coupling in the prepared nanocomposites. The magnetic behavior is found to be strongly dependent upon nickel ferrite content and annealing temperature. Magnetic field-induced relative change of the dielectric constant was observed in the nanocomposites. The fractional change of magnetic field induced in dielectric constant can also be expressed by Δe ∼ γM2 (where γ is magnetoelectric coupling coefficient).
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