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Título:	Morphology and magnetic properties of W-capped Co nanoparticles
Autor:	Figueroa, A. I. CSIC ORCID; Bartolomé, Juan CSIC ORCID; García, L. M. CSIC; Bartolomé, Fernando CSIC ORCID; Magén, César ; Ibarra, M. Ricardo CSIC ORCID; González-Calbet, José M.
Fecha de publicación:	may-2010
Editor:	American Institute of Physics
Citación:	Journal of Applied Physics 107(9): 09B508 (2010)
Resumen:	Co–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.
Descripción:	3 páginas, 3 figuras, 2 tablas.-- et al.
Versión del editor:	http://dx.doi.org/10.1063/1.3368725
URI:	http://hdl.handle.net/10261/47680
DOI:	10.1063/1.3368725
ISSN:	0021-8979
E-ISSN:	1089-7550
Aparece en las colecciones:	(ICMA) Artículos

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Morphology and magnetic properties of W-capped Co nanoparticles