Magnetic polarization of copper in Cu-capped Co clusters

Magnetic anisotropy of Co nanoparticles homogeneously dispersed in alumina is increased by capping the particles with copper. In the present work, we investigate this effect by measuring X-ray magnetic circular dichroism (XMCD) at the K and L 2,3 edges of Co and Cu atoms. We demonstrate that orbital...

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Published inJournal of magnetism and magnetic materials Vol. 316; no. 2; pp. e23 - e26
Main Authors García, L.M., Bartolomé, F., Bartolomé, J., Luis, F., Petroff, F., Deranlot, C., Wilhelm, F., Rogalev, A., Bencok, P., Brookes, N.B.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.09.2007
Subjects
Copper magnetism
Magnetic anisotropy
Magnetic nanoparticle
XMCD
61.10.Ht
Magnetic nanoparticle
Magnetic anisotropy
Copper magnetism
61.46.Df
75.75.+a
XMCD
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Summary:Magnetic anisotropy of Co nanoparticles homogeneously dispersed in alumina is increased by capping the particles with copper. In the present work, we investigate this effect by measuring X-ray magnetic circular dichroism (XMCD) at the K and L 2,3 edges of Co and Cu atoms. We demonstrate that orbital-to-spin ratio at the Co 3d states is increased by capping with Cu, explaining the observed enhancement of the macroscopic anisotropy. Hybridization between Co and Cu at the interface produces an electronic transfer between them. Clear induced magnetic moments are observed in copper, both in the 4p states and in the 3d states.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0304-8853
DOI:10.1016/j.jmmm.2007.02.016