Journal
JOURNAL OF NANOPARTICLE RESEARCH
Volume 13, Issue 10, Pages 5321-5333Publisher
SPRINGER
DOI: 10.1007/s11051-011-0518-5
Keywords
Cobalt; Nanoparticles; Silicon; Oxide; Matrix; Particle-wall interaction; Particle agglomeration
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Funding
- Spanish Ministerio de Ciencia e Innovacion [MAT2005-05524-C02-02, MAT-2007-66181, MAT2008-06765-C02, MAT2008-06517-C02-01, CSD2007-00041 (NANOSELECT), CSD2008-00023 (FUNCOAT), CSD2009-00013]
- European Commission [NMP3-SL-2008-214107]
- Consejo Superior de Investigaciones Cientificas
- Spanish Ministerio de Ciencia e Innovacion
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We present a morphological, structural, and magnetic characterization of Co nanoparticles (mean diameter of 10.3 +/- A 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.
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