Magnetic anisotropy of Cr7Ni spin clusters on surfaces (Articolo in rivista)

Type
Label
  • Magnetic anisotropy of Cr7Ni spin clusters on surfaces (Articolo in rivista) (literal)
Anno
  • 2012-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1002/adfm.201200478 (literal)
Alternative label
  • V. Corradini, A. Ghirri , E. Garlatti , R. Biagi , V. De Renzi , U. del Pennino , V. Bellini , S. Carretta , P. Santini , G. Timco , R. E. P. Winpenny , and M. Affronte (2012)
    Magnetic anisotropy of Cr7Ni spin clusters on surfaces
    in Advanced functional materials (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • V. Corradini, A. Ghirri , E. Garlatti , R. Biagi , V. De Renzi , U. del Pennino , V. Bellini , S. Carretta , P. Santini , G. Timco , R. E. P. Winpenny , and M. Affronte (literal)
Pagina inizio
  • 3706 (literal)
Pagina fine
  • 3713 (literal)
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  • 22 (literal)
Rivista
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  • 8 (literal)
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  • Dr. V. Corradini , Dr. A. Ghirri , Dr. V. Bellini S3 Centre, Institute Nanoscience - CNR, via G. Campi 213/A, 41125 Modena, Italy E-mail: valdis.corradini@unimore.it Dr. E. Garlatti Dipartimento di Scienze Molecolari Applicate ai Biosistemi Università di Milano via Trentacoste 2, 20134 Milano, Italy Dr. R. Biagi , Dr. V. De Renzi , Prof. U. del Pennino , Prof. M. Affronte Dipartimento di Fisica Università di Modena e Reggio Emilia and S3 Centre Institute Nanoscience - CNR via G. Campi 213/A, 41125 Modena, Italy Prof. S. Carretta , Prof. P. Santini Dipartimento di Fisica Università di Parma v.le delle Scienze, 43100 Parma, Italy Dr. G. Timco , Prof. R. E. P. Winpenny School of Chemistry and Photon Science Institute University of Manchester Oxford Road, Manchester, M13 9PL, UK (literal)
Titolo
  • Magnetic anisotropy of Cr7Ni spin clusters on surfaces (literal)
Abstract
  • The problem of the experimental and theoretical determination of magnetic anisotropy in isolated molecular spin clusters is addressed here. To this end, the case of molecular Cr 7 Ni rings sublimated in ultrahigh vacuum conditions and assembled in an ordered fashion on Au(111) surface is addressed and investigated using X-ray magnetic dichroism (XMCD) and theoretical calculations. Fixing the experimental conditions at a temperature T = 8 K and a magnetic fi eld of 5 T, the angular-dependence of the dichroic signal reveals an easy-axis anisotropy for the Ni magnetization along the direction perpendicular to the ring while the magnetization of the whole Cr 7 Ni molecule is preferentially aligned within the ring plane. These features are well reproduced by spin Hamiltonian simulations, which refl ect the character of the S = 3/2 fi rst excited multiplet, dominating at T = 8 K and 5 T. Density functional theory (DFT) calculations show that local spin orbit interactions determine an easy axis anisotropy at the Ni site while the Cr magnetic moment turns out to be more isotropic. This is the fi rst direct observation of the interplay between the single ion and the overall magnetic anisotropy in complex (polynuclear) molecular systems. (literal)
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