Finite size effects on structure and magnetism in mass-selected CoPt nanoparticles View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2013-02-26

AUTHORS

Véronique Dupuis, Nils Blanc, Luis E. Diaz-Sanchez, Arnaud Hillion, Alexandre Tamion, Florent Tournus, Gustavo M. Pastor, Andrei Rogalev, Fabrice Wilhelm

ABSTRACT

We have studied size effect on the local structure and magnetism in CoPt clusters embedded in carbon matrix upon annealing in the 2–4 nm diameter range. From Co-K and Pt-L edges extended X-ray absorption fine structure (EXAFS) experiments and simulations, we report the refined quantitative non trivial structure of size-selected 3 nm in diameter CoPt magnetic clusters. In agreement with ab-initio simulation calculations, we evidenced an element-specific dependence of the local atomic relaxations in CoPt clusters leading to a strong distortion in pure Co planes. Since pure Co layers do not match the underlying Pt layer in chemically ordered L10-like clusters, we claim that a perfect crystal can not exist at nanosize. Such result could explain the low magnetic anisotropy energy measured on chemically ordered CoPt nanomagnets assemblies. More... »

PAGES

25

Identifiers

URI

http://scigraph.springernature.com/pub.10.1140/epjd/e2012-30451-3

DOI

http://dx.doi.org/10.1140/epjd/e2012-30451-3

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1042100498


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