Investigation of giant dielectric and room temperature ferromagnetic response of facile CZTO nanostructure

Abstract

Cubic CoZnTiO4 (CZTO) nanocomposite structure has been synthesized via a modest chemical method at a much lower calcination temperature. The possible phase formations and crystalline nature of the as synthesized structure has been studied by X-ray diffraction technique. FESEM micrographs depict the grain growth within the nanocomposite. Thermal analysis shows endothermic as well as exothermic peaks which points out the thermal stability over the observed temperature range. The synthesized CZTO nanocomposite structure shows nearly frequency independent giant dielectric response on application of external electric field. The nanostructure shows e′ ~ 21,000 at 40 Hz frequency. With the help of internal barrier layer capacitor model, the origin of this large dielectric constant is well explained. The impedance spectroscopy analysis and equivalent circuit response also supports the obtained result. On application of external magnetic field, the synthesized CZTO sample also shows room temperature ferromagnetic response. This magneto-dielectric response of CZTO nanostructure enables it to be a superior material for forthcoming device application.