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

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

2009-12-02

arxiv.org/abs/0912.0483v1

Physical Review B 80, 184428 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 5 figures, 3 tables

Scientific paper

10.1103/PhysRevB.80.184428

The role of dipolar interactions among Ni nanoparticles (NP) embedded in an amorphous SiO2/C matrix with different concentrations has been studied performing ac magnetic susceptibility Chi_ac measurements. For very diluted samples, with Ni concentrations < 4 wt % Ni or very weak dipolar interactions, the data are well described by the Neel-Arrhenius law. Increasing Ni concentration to values up to 12.8 wt % Ni results in changes in the Neel-Arrhenius behavior, the dipolar interactions become important, and need to be considered to describe the magnetic response of the NPs system. We have found no evidence of a spin-glasslike behavior in our Ni NP systems even when dipolar interactions are clearly present.

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