Abstract
Dc-magnetization, ac-susceptibility and x-ray diffraction (XRD) were used to investigate the microscopic origin of the magnetic property modifications induced by zinc doping in bulk and nanosized nickel ferrite, ZnxNi1−xFe2O4. Both the nanoparticle energy barrier to magnetization reversal, EB, and the bulk saturation magnetization, Ms, are observed to initially increase with x, reach a maximum at x∼0.5, and eventually decrease upon further doping. XRD data do not indicate significant structural modifications at x∼0.5. Instead we found evidence that an indirect doping mechanism, by which Ni2+ ions are replaced by Zn2+, is responsible for the observed magnetic property enhancement.
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