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We investigate the consequence of the dimension reduction on the magneticanisotropy of FePt and CoPt nanoparticles. Using an extension of the magneticanisotropy model of N\'eel, we show that, due to a statistical finite sizeeffect, chemically disordered clusters can display a magnetic anisotropy energy(MAE) as high as 0.5\times10^6 J/m3, more than one order of magnitude higherthan the bulk MAE. Concerning L10 ordered clusters, we show that the surfaceinduces a reduction of the MAE as compared to the bulk, due to the symmetrybreaking at the cluster surface, which modifies the chemical order.

Chemical order and size effects on the magnetic anisotropy of FePt and CoPt nanoparticles