RT Journal Article
T1 Fe impurities weaken the ferromagnetic behavior in Au nanoparticles
A1 Crespo del Arco, Patricia
A1 García, M. A.
A1 Fernández Pinel, E.
A1 Multigner, M.
A1 Alcántara, D.
A1 De la Fuente, J. M.
A1 Penadés, S.
A1 Hernando Grande, Antonio
AB 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.
PB American Physical Society
SN 0031-9007
YR 2006
FD 2006-10-27
LK https://hdl.handle.net/20.500.14352/52008
UL https://hdl.handle.net/20.500.14352/52008
LA eng
NO © 2006 The American Physical Society.Support by Spanish MEyC Projects Nos. NAN2004-09125-C07 and MAT2005-06119 is acknowledged.
NO Spanish MEC
DS Docta Complutense
RD 24 abr 2025