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Comparative study of the Magnetoelectric Properties in Core-Shell Nanocomposites as well as mixture of CoFe2O4:BaTiO3

Arka Chaudhuri

Abstract


Nanostructures of multiferroic materials have been drawing increasing curiosity due to the boosted magnetoelectric coupling and potential for succeeding generation multifunctional devices. Composites of ferroelectric and magnetostrictive materials indicate more magnetoelectric coupling than single phase materials. Core-shell CoFe2O4:BaTiO3 nanocomposites (1:1 weight ratio) and a mixture of both of them have been produced by a combination of hydrothermal and sol gel techniques. X ray diffraction analysis endorses the presence of both the materials in the samples. High Resolution Transmission Electron Microscope images confirm the core shell structure. The magnetoelectric coupling effect is scrutinized by measuring the magnetoelectric coefficient. It is detected that the coefficient (8130 μV/cm.Oe) is 80 times higher in the core-shell nanocomposites compared to that of the mixture (101 μV/cm.Oe). The ME coefficient achieved by us is also higher than the maximum reported so far 3500 μV/cm.Oe by Duong et al. We have also showed this fact from the Magnetisation (M) vs Magnetic Field (H) measurements. Keywords: Magnetoelectric coupling, magnetoelectric coefficient, magnetostriction, piezoelectricity, core shell

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