Fe Impurities Weaken the Ferromagnetic Behavior in Au Nanoparticles | Zendy

P. Crespo | Zendy; M. A. Garcı̀a | Zendy; E. Fernández Pinel | Zendy; M. Multigner | Zendy; David Alcántara | Zendy; Jesús M. de la Fuente | Zendy; S. PENADES | Zendy; A. Hernando | Zendy

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Fe Impurities Weaken the Ferromagnetic Behavior in Au Nanoparticles

Author(s) -

P. Crespo,

M. A. Garcı̀a,

E. Fernández Pinel,

M. Multigner,

David Alcántara,

Jesús M. de la Fuente,

S. PENADES,

A. Hernando

Publication year - 2006

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.97.177203

Subject(s) - ferromagnetism , impurity , condensed matter physics , materials science , magnetization , hysteresis , nanoparticle , magnetic anisotropy , anisotropy , magnetic hysteresis , magnetic field , nanotechnology , chemistry , physics , optics , quantum mechanics , organic chemistry

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

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