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

  • Véronique Dupuis
  • Nils Blanc
  • Luis E. Diaz-Sanchez
  • Arnaud Hillion
  • Alexandre Tamion
  • Florent Tournus
  • Gustavo M. Pastor
  • Andrei Rogalev
  • Fabrice Wilhelm
Regular Article
Part of the following topical collections:
  1. Topical issue: ISSPIC 16 - 16th International Symposium on Small Particles and Inorganic Clusters

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.

Keywords

CoPt Carbon Matrix European Synchrotron Radiation Facility Chemical Order Local Relaxation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Véronique Dupuis
    • 1
  • Nils Blanc
    • 1
  • Luis E. Diaz-Sanchez
    • 2
  • Arnaud Hillion
    • 1
  • Alexandre Tamion
    • 1
  • Florent Tournus
    • 1
  • Gustavo M. Pastor
    • 2
  • Andrei Rogalev
    • 3
  • Fabrice Wilhelm
    • 3
  1. 1.LPMCN, UMR 5586 CNRS/Université de LyonVilleurbanne CedexFrance
  2. 2.ITP, Institut für Theoretische Physik, Universität KasselKasselGermany
  3. 3.European Synchrotron Radiation FacilityGrenoble CedexFrance

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