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Fe impurities weaken the ferromagnetic behavior in Au nanoparticles

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Crespo del Arco, Patricia and García, M. A. and Fernández Pinel, E. and Multigner, M. and Alcántara, D. and De la Fuente, J. M. and Penadés, S. and Hernando Grande, Antonio (2006) Fe impurities weaken the ferromagnetic behavior in Au nanoparticles. Physical review letters, 97 (17). ISSN 0031-9007

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Official URL: http://dx.doi.org/10.1103/PhysRevLett.97.177203


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Abstract

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.


Item Type:Article
Additional Information:

© 2006 The American Physical Society.
Support by Spanish MEyC Projects Nos. NAN2004-09125-C07 and MAT2005-06119 is acknowledged.

Uncontrolled Keywords:Gold; Glyconanoparticles; Molecules
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:41792
Deposited On:14 Mar 2017 11:56
Last Modified:14 Mar 2017 11:56

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