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Aggregated Co particles were produced by inert-gas evaporation in Ar. A fractal dimension Df was extracted from electron micrographs; it was strongly dependent on the mean particle radius R{}. We found 1.9{}Df{}2.05 at R{}{}8 nm and 1.35{}Df{}1.6 at R{}{}8 nm. The low Df can be understood as an effect of magnetic dipole interaction, leading to chainlike aggregates when the critical size for ferromagnetism in Co particles is exceeded. The experimental values are in good agreement with recent computer simulations.
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Niklasson et al. (1988) studied this question.
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