Specific local relaxation and magnetism in mass-selected CoPt nanoparticles Veronique Dupuis, Nils Blanc, Luis Enrique Díaz-Sánchez, Arnaud Hillion, Alexandre Tamion, Florent Tournus and Gustavo Miguel Pastor Eur. Phys. J. B, 86 3 (2013) 83 Published online: 06 March 2013 DOI: 10.1140/epjb/e2013-30644-0