Abstract
We describe the magnetism of CoPt clusters upon annealing-driven transition to chemically ordered L10-like phase. In one hand, X-ray magnetic circular dichroism (XMCD) investigations at each L2 3 edge, revealed a significant increase of both spin and orbital of Co and Pt magnetic moments after thermal ordering transition. In the other hand, reversely to the bulk alloys, a limited Magnetic Anisotropy Energy (MAE) enhancement has been obtained from SQUID magnetometry measurements on the same chemically ordered CoPt nanomagnets samples. In this paper, we relate such magnetic behaviour to element-specific dependence of the local atomic relaxations in nanoalloys, described from extended x-ray absorption fine structure (EXAFS) experiments.
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