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.
Magnetic Anisotropy of Cr7Ni Spin Clusters on Surfaces / Valdis, Corradini; Alberto, Ghirri; Elena, Garlatti; Biagi, Roberto; DE RENZI, Valentina; DEL PENNINO, Umberto; Valerio, Bellini; Stefano, Carretta; Paolo, Santini; Grigore, Timco; Richard E. P., Winpenny; Affronte, Marco. - In: ADVANCED FUNCTIONAL MATERIALS. - ISSN 1616-301X. - STAMPA. - 22:17(2012), pp. 3706-3713. [10.1002/adfm.201200478]
Magnetic Anisotropy of Cr7Ni Spin Clusters on Surfaces
BIAGI, Roberto;DE RENZI, Valentina;DEL PENNINO, Umberto;AFFRONTE, Marco
2012
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.
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