Effect of temperature on the dielectric and magnetic properties of NiFe2O4@MgFe2O4 and ZnFe2O4@MgFe2O4 core-shell

This work discusses the experimental results of the electrical and magnetic properties of the core-shell NiFe2O4@MgFe2O4 (NiF@MgF), and ZnFe2O4@MgFe2O4 (ZnF@MgF). The conductivity behavior showed semiconductor-metallic behavior, which varies between NSPT, OSPT, and CBH models depending on the temperatures and the frequencies. In addition, the dielectric showed that a mutual effect between the core and the shell materials, which increases the polarization of the space charge. From this point of view, the nanocomposites show conductive or semiconductor behavior depending on temperature, so they have the potential in many electronic devices application. The magnetization M(T) with the Faraday balance method indicates a good magnetic property of the ZnF@MgF sample. Moreover, the effective magnetic moment (mu (Eff)) and the Curie-Weiss constant (theta) were obtained from the protocols chi (T).