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Título

Enhancement of the magnetic anisotropy of Co clusters by Au capping

AutorLuis, Fernando; Bartolomé, Juan; Bartolomé, Fernando; Martínez Pérez, M. J.; García, L. M.
Palabras claveCobalt
Ferromagnetic materials
Gold
Magnetic anisotropy
Sputter deposition
Nanoparticles
Particle size
Magnetisation reversal
Coercive force
Superparamagnetism
Bonds (chemical)
Fecha de publicación26-abr-2006
EditorAmerican Institute of Physics
CitaciónJournal of Applied Physics 99(8): 08G705-08G705-3 (2006)
ResumenWe study the magnetic properties of Co nanoparticles, prepared by sputtering, with diameters ranging from 1 to 3.5 nm. The effective anisotropy, which determines the activation energy for the magnetization reversal, increases with decreasing particle's size, showing the dominant role played by surface atoms. We find that the superparamagnetic blocking temperature and the coercive field are significatively enhanced when the clusters are capped by a thin Au layer. This enhancement is probably caused by the bonding or hybridization of Co and Au atoms at the interface between the two metals. It provides thus a method to modify the magnetic anisotropy, which can be of interest for the applications of magnetic nanoparticles.
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Versión del editorhttp://dx.doi.org/10.1063/1.2172217
URIhttp://hdl.handle.net/10261/19230
DOI10.1063/1.2172217
ISSN0021-8979
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