Abstract
This paper reports the magnetic properties of a series of Mn-Ni mixed ferrite nanoparticles with the compositional formula Mn1-xNixFe2O4 (where x = 0.1, 0.2, 0.3, 0.4, 0.5) prepared by a low temperature chemical co-precipitation method. The effect of compositional variation on the important magnetic parameters namely saturation magnetization, coercivity and remanance were studied and discussed in terms of the magnetic moments of the cations and their specific preference for the tetrahedral (A) sites and the octahedral (B) sites. Further, a detail study on dependence of magnetization on applied magnetic field was performed using law of approach to saturation. Different forms of law of approach to saturation namely, M=Ms[1−aH−bH2]+kH, M=Ms[1−aH−bH2], M=Ms[1−bH2] and M=Ms(1−115HA2H12(H32+HR32))+kH were applied to the series of the prepared nanoferrites. The statistical parameters namely χ2 and R2 which provides the idea of goodness of fitting were used to study the dependency of magnetization on the applied magnetic field.
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