Magnetic properties of nano-multiferroic materials

Latent magnetization in the multiferroics can be achieved via the structural distortion with respect to particle size and destroying the spiral spin structure, which plays the vital role in high-performance applications. In this investigation, multifunctional single phase Bi_1−xLa_xFe_1−yCo_yO₃ nanomaterials were synthesized by co-precipitation technique. The chemical composition, phase genesis, morphology and thermal characteristics of the Bi_1−xLa_xFe_1−yCo_yO₃ were studied by FTIR, XRD, SEM/EDS, TEM and TGA. XRD studies confirmed single phase distorted rhombohedral structure in Bi_1−xLa_xFe_1−yCo_yO₃. The novelty in magnetic behavior of the Bi_0.85La_0.15Fe_0.75Co_0.25O₃ multiferroic at room temperature showed both ferro and anti-ferromagnetic nature with higher order remanent magnetization among other nanocomposites in this study. This magnetic anomaly in Bi_0.85La_0.15Fe_0.75Co_0.25O₃ is due to doping and size effects on the crystal structure that leads to spin-orbit interactions. Besides, Bi_0.85La_0.15Fe_0.75Co_0.25O₃ integrated graphene oxide (GO) nanocomposite has shown the change in the magnetic hysteresis that indicates the effect of the semiconducting behavior of GO on the ordered magnetic moments in the multiferroic. This kind of magnetic anomaly could form advanced multiferroic devices.