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Título:
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Permanent magnetism, magnetic anisotropy, and hysteresis of thiol-capped gold nanoparticles
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Autores:
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Crespo del Arco, Patricia ;
Litran, R. ;
Rojas, T. C. ;
Multigner, M. ;
De la Fuente, J. M. ;
Sánchez López, J. C. ;
García, M. A. ;
Hernando Grande, Antonio ;
Penadés, S. ;
Fernández, A.
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Tipo de documento:
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texto impreso
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Editorial:
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American Physical Society, 2004-08-20
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física: Física de materiales
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Materia = Ciencias: Física: Física del estado sólido
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Tipo = Artículo
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Resumen:
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We report on the experimental observation of magnetic hysteresis up to room temperature in thiol-capped Au nanoparticles with 1.4 nm size. The coercive field ranges from 860 Oe at 5 K to 250 Oe at 300 K. It is estimated that the Au atoms exhibit a magnetic moment of mu=0.036mu(B). However, Au nanoparticles with similar size but stabilized by means of a surfactant, i.e., weak interaction between protective molecules and Au surface atoms, are diamagnetic, as bulk Au samples are. The apparent ferromagnetism is consequently associated with 5d localized holes generated through Au-S bonds. These holes give rise to localized magnetic moments that are frozen in due to the combination of the high spin-orbit coupling (1.5 eV) of gold and the symmetry reduction associated with two types of bonding: Au-Au and Au-S.
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En línea:
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https://eprints.ucm.es/41835/1/CrespoP%2017%20LIBRE.pdf
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