Magnetic nanoparticle assemblies in high concentrations can exhibit spin glass like properties in the low temperature phase due to the influence of strong dipolar interactions. To address the question of the extent to which the properties of these “superspin” glasses mimic those of an atomic spin glass, several homogeneously dispersed γ-Fe2O3 nanoparticle assemblies of varying volume fraction have been studied. In a concentrated sample, the main features of atomic spin glasses have been observed including aging phenomena for which we have proposed a rescaling.
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Parker et al. (2005) studied this question.
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