L10-ordered MnAu clusters on a TEM grid. The particle agglomeration visible in this image is usually a combination of projection and physical interaction effects.
Angular correlations in ferromagnets: (a) mean-field model and (b) Onsager correction.
Nanoscale implementation of the Onsager correction. Onsager correlations in ferromagnets extend over many interatomic distances a but not necessarily over many grain or particle diameters 2R.
Effect of interactions on the hysteresis loop: (a) exchange interactions and (b) magnetostatic interactions. The dashed lines correspond to noninteracting particles and the arrow in (b) indicates where the net magnetostatic interaction is zero.
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