Fe impurities weaken the ferromagnetic behavior in Au nanoparticles
| Autor: | P. Crespo, David Alcantara, Antonio Hernando, Marta Multigner, Soledad Penadés, J. M. de la Fuente, Miguel A. García, E. Fernandez Pinel |
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| Jazyk: | angličtina |
| Rok vydání: | 2006 |
| Předmět: |
Temperatures
Materials science Condensed matter physics Física de materiales General Physics and Astronomy Nanoparticle Au NPs Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Fe Hysteresis Magnetization Ferromagnetism Impurity Ferromagnetic Física del estado sólido Thiol Glyconanoparticles Condensed Matter::Strongly Correlated Electrons Ferromagnetic order Anisotropy Spontaneous magnetization Magnetic impurities Histeresys |
| Zdroj: | E-Prints Complutense: Archivo Institucional de la UCM Universidad Complutense de Madrid Digital.CSIC. Repositorio Institucional del CSIC instname E-Prints Complutense. Archivo Institucional de la UCM |
| Popis: | 4 páginas, 4 figuras, 1 tabla. 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. Support by Spanish MEyC Projects Nos. NAN2004-09125-C07 and MAT2005-06119 is acknowledged. |
| Databáze: | OpenAIRE |
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