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Morphological, structural, and magnetic properties of Co nanoparticles in a silicon oxide matrix

AuthorsDíaz Lagos, Mercedes ; Martínez-Orellana, Lidia ; Ruano Díaz, Manuel ; Llamosa Pérez, Daniel ; Román García, Elisa Leonor ; García-Hernández, M. ; Fermento, Rui ; Cebollada, Alfonso ; Armelles Reig, Gaspar ; Huttel, Yves
KeywordsParticle agglomeration
Particle-wall interaction
Issue DateOct-2011
CitationJournal of Nanoparticle Research 13: 5321-5333 (2011)
AbstractWe present a morphological, structural, and magnetic characterization of Co nanoparticles (mean diameter of 10.3 ± 1.8 nm) grown using a gas aggregation source and embedded in a silicon oxide matrix by sequential deposition of nanoparticles and silicon oxide. We show that the Co nanoparticles >soft-land> on the substrates and suffer a moderate oxidation in contact with the silicon oxide. Despite this moderate oxidation, it is found that, at room temperature, the magnetic volume of the resulting nanoparticles is below the superparamagnetic limit. The results presented in this article are compatible with the presence of an assembly of magnetically independent particles that also display a moderate exchange bias at low temperature. © 2011 Springer Science+Business Media B.V.
Identifiersdoi: 10.1007/s11051-011-0518-5
issn: 1388-0764
e-issn: 1572-896X
Appears in Collections:(IMN-CNM) Artículos
(ICMM) Artículos
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