Magnetic Investigation of Se/In Codoped Co0.5Ni0.5Fe2O4 Spinel Nanoparticles Synthesized via the Sonochemical Route

Abstract

The magnetic traits of sonochemically synthesized Co0.5Ni0.5In x Se3x Fe2-5x O4 nanoparticles [(In/Se -> Co0.5Ni0.5Fe2O4) (x <= 0.1) NPs] have been investigated in detail. X-ray powder diffraction analysis confirmed the purity and cubic phase crystalline structure of all products. The products' chemical composition has been confirmed by EDX and elemental mapping analyses. The magnetization characteristics of Co0.5Ni0.5In2x Se3x Fe2-6x O4 (In/Se -> Co0.5Ni0.5Fe2O4) (x <= 0.1) NPs revealed superparamagnetic behavior at room temperature and ferrimagnetic behavior at low temperatures (T s). The blocking temperature (T B) that defines the superparamagnetic-ferrimagnetic state transition was also determined via analysis of the ZFC and FC magnetization curves. T B was found to move to lower T s as the amount of selenium amount increased. Moreover, the undoped Co0.5Ni0.5Fe2O4 NPs displayed the highest magnetic characteristics (such as M s, M r, H c, K eff, and n B), which are depressed after In/Se codoping. The superparamagnetic feature could be promising for some interesting applications, including biosensing, magnetic hyperthermia, magnetic resonance imaging, and targeted drug delivery, while the ferrimagnetic behavior can make the material interesting for electrical applications.