The investigation concentrated on synthesizing and characterizing nano ferrite powders of SrFe12O19 (M-type hexaferrite) and NiFe2O4 (spinel) using an extract from Calotropis gigantea (crown) flowers. The exploration extended to the creation of SrFe12O19/NiFe2O4 nanocomposites with different weight ratios (M:S – 9:1, 8:2, 7:3, 6:4, 5:5). The nanocomposites demonstrated an average crystallite size ranging from 25 nm to 44 nm, with XRD analysis confirming the existence of both M and S phases. Analysis of magnetic properties revealed a reduction in coercivity and saturation magnetization with an increasing amount of the spinel phase. Composites with weight ratios 9:1, 8:2, 7:3, and 6:4 exhibited properties typical of hard ferrite, while the 5:5 ratio displayed a soft magnetic characteristic. A multi-domain structure was observed in all prepared composites. Notably, diverse exchange coupling interactions were identified across the various weight ratios, encompassing weak to partial, and perfect exchange coupling interactions. Overall, the research emphasizes the impact of weight ratios on the structural and magnetic characteristics of the nanocomposites, providing insights into their potential applications in magnetic devices.

https://doi.org/10.1016/j.jallcom.2021.163415

#NanoFerrite

#MaterialScience

#Nanocomposites

#Hexaferrite

#XRDAnalysis

#StructuralCharacterization