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A set of symmetric and asymmetric superlattices with ferromagneticLa0.6Sr0.4MnO3 and ferroelectric 0.7Pb(Mg0.33Nb0.67)O3 0.3(PbTiO3) as theconstituting layers were fabricated on LaNiO3 coated (100) oriented LaAlO3substrates using pulsed laser ablation. The crystallinity, magnetic andferroelectric properties were studied for all the superlattices. All thesuperlattice structures exhibited a ferromagnetic behavior over a wide range oftemperatures between 10K and 300K, whereas only the asymmetric superlatticesexhibited a reasonably good ferroelectric behaviour. Strong influence of anapplied magnetic field was observed on the ferroelectric properties of theasymmetric superlattices. Studies were conducted towards understanding theinfluence of conducting LSMO layers on the electrical responses of theheterostructures. The absence of ferroelectricity in the symmetric superlatticestructures has been attributed to their high leakage characteristics. Theeffect of an applied magnetic field on the ferroelectric properties of theasymmetric superlattices indicated strong influence of the interfaces on theproperties. The dominance of the interface on the dielectric response wasconfirmed by the observed Maxwell Wagner type dielectric relaxation in theseheterostructures.Comment: full pape

Realization of biferroic properties in La0.6Sr0.4MnO3∕0.7Pb(Mg1∕3Nb2∕3)O3–0.3(PbTiO3) epitaxial superlattices