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Morphology and magnetic properties of W-capped Co nanoparticles

AuthorsFigueroa, A. I.; Bartolomé, Juan; García, L. M.; Bartolomé, Fernando; Magen, Cesar; Ibarra, M. Ricardo; González-Calbet, José M.
Issue DateMay-2010
PublisherAmerican Institute of Physics
CitationJournal of Applied Physics 107(9): 09B508 (2010)
AbstractCo–W nanoparticles formed by sequential sputtering of Co on amorphous alumina substrate and subsequent W capping are studied by high resolution and by scanning transmission electron microscopies, and by superconducting quantum interference device magnetometry. The analysis is focused on W nominal thickness dependence. Results suggest the formation of amorphous Co–W alloy nanoparticles, whose magnetic moment per Co atom is systematically reduced as the nominal thickness of W capping layer increases. The Co–W nanoparticles show superparamagnetic behavior. The activation energy for moment reversal and the effective anisotropy are obtained.
Description3 páginas, 3 figuras, 2 tablas.-- et al.
Publisher version (URL)http://dx.doi.org/10.1063/1.3368725
Appears in Collections:(ICMA) Artículos
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