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Título:
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Magnetic properties of Ni nanoparticles dispersed in silica prepared by high-energy ball milling
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Autores:
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González Herrera, Elvira María ;
Montero, M. I. ;
Cebollada, F. ;
De Julián Fernández, C ;
Vicent López, José Luis ;
González, J. M.
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Tipo de documento:
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texto impreso
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Editorial:
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E D P Sciences, 1998-04-01
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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 analyze the magnetic properties of mechanically ground nanosized Ni particles dispersed in a SiO_2 matrix. Our magnetic characterization of the as-milled samples show the occurrence of two blocking processes and that of non-monotonic milling time evolutions of the magnetic-order temperature, the high-field magnetization and the saturation coercivity. The measured coercivities exhibit giant values and a uniaxial- type temperature dependence. Thermal treatment carried out in the as-prepared samples result in a remarkable coercivity reduction and in an increase of the high-field magnetization. We conclude, on the basis of the consideration of a core (pure Ni) and shell (Ni-Si inhomogeneous alloy) particle structure, that the magnetoelastic anisotropy plays the dominant role in determining the magnetic properties of our particles.
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En línea:
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https://eprints.ucm.es/43919/1/Gonz%C3%A1lezH%20EM%2035LIBRE.pdf
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