Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/37788
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Título : Fe Impurities Weaken the Ferromagnetic Behavior in Au Nanoparticles
Autor : Crespo, Patricia, García, M. A., Fernández Pinel, E., Multigner, M., Alcántara, David, Penadés, Soledad, Hernando, Antonio
Palabras clave : Magnetic impurities
Temperature
Thiol
Glyconanoparticles
Histeresys
Au NPs
Fe
Ferromagnetic
Fecha de publicación : 26-Oct-2006
Editor: American Physical Society
Resumen: 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.
Descripción : 4 páginas, 4 figuras, 1 tabla.
Versión del editor: http://dx.doi.org/10.1103/PhysRevLett.97.177203
URI : http://hdl.handle.net/10261/37788
ISSN: 0031-9007
DOI: 10.1103/PhysRevLett.97.177203
Citación : Physical Review Letters 97(17): 177203 (2006)
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