Enhanced coercivity of NiFe 1– x Dy x CrO 4 ferrites synthesised by glycine-nitrate combustion method

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The present work was focused on the effect of small amounts of Dy doping on the structural and magnetic properties of Ni-Cr ferrite materials. All the ferrites possess cubic symmetry corresponding to the space group [Formula: see text] with small amounts of secondary phase DyFeO 3 . No regular trend in the lattice parameter a with Dy doping has been observed. Room temperature magnetisation results, obtained from Vibrating Sample Magnetometer measurements, showed a decrease in saturation magnetisation with Dy doping. Enhanced coercivity in undoped Ni-Cr ferrite is observed which was several orders of magnitude higher than that of the reported bulk material. Substitution of Dy in Ni-Cr ferrite further enhances coercivity thereby making the materials magnetically more hard.