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Título:
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Coercivity and its thermal dependence in microsized magnetic particles: Influence of grain boundaries
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Autores:
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Marín Palacios, María Pilar ;
Aragón, A. M ;
Garcia Escoria, A. ;
Lieblich, M. ;
Crespo del Arco, Patricia ;
Hernando Grande, Antonio
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Tipo de documento:
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texto impreso
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Editorial:
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American Institute of Physics, 2013-01-28
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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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Tipo = Artículo
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Resumen:
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Fe_(73.5)Si_(13.5)B_9Nb_3Cu_1 powder particles have been obtained by gas atomization. Magnetization curves and coercivity were studied for particles ranging in size up to 1000?. The overall magnetic behavior of such material is consequence of compositional heterogeneity of the microstructure as a whole. Anomalous temperature variation of coercivity (H_c) (i.e., a decrease in H_c with decreasing temperature) together with a decrease of saturation magnetization has been observed for less than 25 ?m size. The origin of this behavior has been ascribed to metastable FeCu and FeNbSi phases in combination with an Fe-rich one. Making magnetic powders with coercive fields of the order of mOe remains a challenge for researchers. Our experiment has allowed us, at low temperature, achieving a coercive field of 9 Oe, much lower than those observed so far in this type of materials. This behaviour has been related with a FeCu phase present on grain boundaries.
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En línea:
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https://eprints.ucm.es/41614/1/CrespoP%2001%20LIBRE.pdf
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