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The role of dipolar interactions among Ni nanoparticles (NP) embedded in anamorphous SiO2/C matrix with different concentrations has been studiedperforming ac magnetic susceptibility Chi_ac measurements. For very dilutedsamples, with Ni concentrations < 4 wt % Ni or very weak dipolar interactions,the data are well described by the Neel-Arrhenius law. Increasing Niconcentration to values up to 12.8 wt % Ni results in changes in theNeel-Arrhenius behavior, the dipolar interactions become important, and need tobe considered to describe the magnetic response of the NPs system. We havefound no evidence of a spin-glasslike behavior in our Ni NP systems even whendipolar interactions are clearly present.

Role of dipolar interactions in a system of Ni nanoparticles studied by magnetic susceptibility measurements