Fe impurities weaken the ferromagnetic behavior in Au nanoparticles

被引：51
作者：
Crespo, P.
Garcia, M. A.
Fernandez Pinel, E.
Multigner, M.
Alcantara, D.
de la Fuente, J. M.
Penades, S.
Hernando, A.
机构：
[1] UCM, CSIC, RENFE, Inst Magnetismo Aplicado, Madrid 28230, Spain
[2] UCM, Dpto Fis Mat, Madrid 28040, Spain
[3] CSIC, IIQ, Lab Glyconanotechnol, Grp Carbohidratos, Seville 41092, Spain
来源：
PHYSICAL REVIEW LETTERS | 2006年 / 97卷 / 17期
关键词：
D O I：
10.1103/PhysRevLett.97.177203
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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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页数：4
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