Preparation and magnetic properties of the conductive Co(1−x)NixFe2O4/polyaniline microsphere composites

► Core-shell Inorganic/organic nanocomposites, where the core is inorganic. ► The shell is conductive polymer and are prepared by combination of sol-gel process and in-situ polymerization method. ► The composites contain the excellent performance of inorganic/organic materials. ► It has potential applications in biomedical, magnetic recording media and absorbing materials.