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oai:docta.ucm.es:20.500.14352/520082023-08-25T14:05:03Zcom_20.500.14352_14col_20.500.14352_15

00925njm 22002777a 4500 dc Crespo del Arco, Patricia author García, M. A. author Fernández Pinel, E. author Multigner, M. author Alcántara, D. author De la Fuente, J. M. author Penadés, S. author Hernando Grande, Antonio author 2006-10-27 In this Letter, we report on a crucial experiment showing that magnetic impurities reduce the ferromagnetic order temperature in thiol-capped Au glyconanoparticles (GNPs). The spontaneous magnetization of AuFe GNPs exhibits a fast decrease with temperature that contrasts with the almost constant value of the magnetization observed in Au NPs. Moreover, hysteresis disappears below 300 K. Both features indicate that Fe impurities reduce the high local anisotropy field responsible for the ferromagnetic behavior in Au GNPs. As a consequence, the amazing ferromagnetism in Au NPs should not be associated with the presence of magnetic impurities. 0031-9007 10.1103/PhysRevLett.97.177203 https://hdl.handle.net/20.500.14352/52008 http://dx.doi.org/10.1103/PhysRevLett.97.177203 http://journals.aps.org Fe impurities weaken the ferromagnetic behavior in Au nanoparticles