Magneto-structural studies of sol–gel synthesized nanocrystalline manganese substituted nickel ferrites

• NiFe2−xMnxO4 system was synthesized by a chemical combustion route.
• All samples shows cubic phase.
• All the synthesized ferrospinels are in nanocrystalline form.
• The saturation magnetization decreases with increase in Mn content.

Nanocrystalline NiFe2−xMnxO4 (2≥x≥0) ferrites were prepared by sol–gel method. X-ray diffraction patterns reveal that synthesized compounds are in single phase cubic spinel lattice for all the composition. The surface morphology of all the samples were studied by scanning electron microscopy. The particle size measured from transmission electron microscopy and X-ray diffraction patterns confirms the nanosized dimension of the as-prepared powder. The elemental analysis was carried out by energy dispersive X-ray analysis technique. Magnetic properties such as saturation magnetization, coercivity and remanence are studied as a function of increasing Mn concentration at room temperature. The saturation magnetization shows a decreasing trend with increase in Mn content. The substitution of manganese in the nickel ferrite affects the structural and magnetic properties of cubic spinels.

Figure optionsDownload as PowerPoint slide