Local magnetism in granular iron/iron oxide nanostructures: a phase- and site- selective X-ray magnetic circular dichroism study (Articolo in rivista)

Type
Label
  • Local magnetism in granular iron/iron oxide nanostructures: a phase- and site- selective X-ray magnetic circular dichroism study (Articolo in rivista) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Alternative label
  • L. Signorini; L. Pasquini; F. Boscherini; E. Bonetti; I. Letard; S. Brice-Profeta; Ph. Sainctavit (2006)
    Local magnetism in granular iron/iron oxide nanostructures: a phase- and site- selective X-ray magnetic circular dichroism study
    in Physical review. B, Condensed matter and materials physics; The American Physical Society, College Park, MD 20740-3844 (Stati Uniti d'America)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • L. Signorini; L. Pasquini; F. Boscherini; E. Bonetti; I. Letard; S. Brice-Profeta; Ph. Sainctavit (literal)
Pagina inizio
  • 014426 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 74 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Department of Physics and CNISM, University of Bologna, Viale C. Berti Pichat 6/2, I-40127, Bologna, Italy; European Synchrotron Radiation Facility 6 rue Jules Horowitz, BP 220, F-38043, Grenoble Cedex, France; ENSEEG/LTPCM Domaine Universitaire, 1130 rue de la piscine, BP 75, F-38402, Saint-Martin d'Hères Cedex, France; IMPMC, UMR 7590, CNRS & UPMC 4 place Jussieu, F-75252 Paris cedex 05, France; (literal)
Titolo
  • Local magnetism in granular iron/iron oxide nanostructures: a phase- and site- selective X-ray magnetic circular dichroism study (literal)
Abstract
  • We present a study of the local magnetic properties of iron/iron oxide granular nanostructures by x-ray magnetic circular dichroism ?XMCD?. Metallic iron ??-Fe? nanoparticles, with average sizes ranging from 5 to 13 nm, are embedded in a nanocrystalline oxide matrix composed of both magnetite ?Fe3O4? and maghemite ??-Fe2O3?. These granular samples were synthesized by cold compacting core-shell nanoparticles, in which a 2-3 nm-thick oxide layer surrounds the iron particles, synthesized by inert gas condensation. By exploiting the chemical selectivity and site sensitivity of XMCD, we were able to separate the magnetic contributions of the metallic core and of the two oxide phases present in the matrix and to study their behavior as a function of iron particle size and applied magnetic induction field. We detected the presence of a significant spin canting, predominantly affecting the octahedral sites of Fe in the oxide (literal)
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