O Šipr et al 2007 J. Phys.: Condens. Matter 19 096203 doi:10.1088/0953-8984/19/9/096203
O Šipr1, S Bornemann2, J Minár2, S Polesya2, V Popescu2,3, A Šimůnek1 and H Ebert2
Show affiliationsThe influence of cluster size and of cluster–substrate interaction on the magnetic properties of Co clusters of 1–10 atoms on Pt(111) and Au(111) is studied by fully relativistic ab initio calculations. The focus is on systematic trends of the spin and orbital magnetic moments, the exchange coupling, and the crossover temperature. The spin magnetic moments of Co clusters are larger for the Pt substrate than for the Au substrate, while the reverse is true for the orbital magnetic moments. The local magnetic moments of Co atoms generally increase if the number of Co neighbours decreases. The exchange coupling constants Jij depend on the cluster size and on the location of respective atoms. The crossover temperature increases monotonically with cluster size and is larger for clusters on Pt than for clusters on Au.
75.30.Cr Saturation moments and magnetic susceptibilities
75.75.+a Magnetic properties of nanostructures
75.30.Et Exchange and superexchange interactions
73.20.At Surface states, band structure, electron density of states
Condensed matter: electrical, magnetic and optical
Issue 9 (7 March 2007)
Received 20 November 2006, in final form 22 December 2006
Published 14 February 2007
O Šipr et al 2007 J. Phys.: Condens. Matter 19 096203
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