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The energy barrier distribution Eb of five samples with differentconcentrations x of Ni nanoparticles using scaling plots from ac magneticsusceptibility data has been determined. The scaling of the imaginary part ofthe susceptibility Chi"(nu, T) vs. Tln(t/tau_0) remains valid for all samples,which display Ni nanoparticles with similar shape and size. The mean value<E_b> increases appreciably with increasing x, or more appropriately withincreasing dipolar interactions between Ni nanoparticles. We argue that such anincrease in <Eb> constitutes a powerful tool for quality control in magneticrecording media technology where the dipolar interaction plays an importantrole.

Increase in the magnitude of the energy barrier distribution in Ni nanoparticles due to dipolar interactions