Tailoring magnetic properties of CoNi-Ferrite/SiO2 nanocomposite

A series of CoNi-Ferrite/SiO2 Nanocomposite with diluted magnetic properties is synthesized using a modified self-combustion approach. Comprehensive structural characterization, including X-ray diffraction (XRD), Raman spectroscopy and field emission scanning electron microscopy (FESEM), reveals a ferrite-SiO2 interface. XRD analysis confirms the presence of both crystalline ferrite and amorphous SiO2 phases, while FESEM images show uniform particle distribution and morphology. The incorporation of SiO2 into the CoNi-Ferrite matrix creates a phase interface, leading to a linear decrease in saturation magnetization and magnetic remanence with increasing SiO2 content, due to diluted magnetic interactions and the non-magnetic SiO₂ barrier controls inter-particle distance and surface spin effects. Raman intensity decreases with increasing SiO2 content is due to non-magnetic SiO2 dilution. The modified solution self-combustion method offers a scalable and cost-effective route for producing these nanocomposites. These findings have significant implications for developing magnetic materials with controlled properties for emerging technologies, including magnetic storage and magnetic sensors.