2011/05/31 by Stanislas Rohart, Rohart, Stanislas, Florent Tournus +3
Physics and Astronomy · #FOS: Physical sciences #Magnetic properties of thin films #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Surface and Thin Film Phenomena #Theoretical and Computational Physics #cond-mat.mes-hall
paper · pdf · doi:10.48550/arxiv.1105.6292
arxiv created 2011/05/31 · openalex publication_date 2011/05/31 · arxiv updated 2011/06/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We investigate the consequence of the dimension reduction on the magnetic anisotropy of FePt and CoPt nanoparticles. Using an extension of the magnetic anisotropy model of Néel, we show that, due to a statistical finite size effect, chemically disordered clusters can display a magnetic anisotropy energy (MAE) as high as 0.5×106 J/m3, more than one order of magnitude higher than the bulk MAE. Concerning L10 ordered clusters, we show that the surface induces a reduction of the MAE as compared to the bulk, due to the symmetry breaking at the cluster surface, which modifies the chemical order.