ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
The modern STM technique allows to manipulate the structure of small clusters on surfaces and to produce one- or two-dimensional nanostructures. It can be speculated that due to the reduction of coordination number many of these clusters containing transition elements are magnetic. In this paper we will show that small clusters of 3d, 4d, and 5d atoms are magnetic on different substrates. Our calculations are based on density functional theory and a newly developed KKR Green's function method for defects at surfaces. We calculate the magnetic properties of several linear chains (C) and plane islands (I) of 4d and 5d adatoms. In particular we consider linear chains of 2 (dimers, C2), 3 and 4 adatoms (C3 and C4), being oriented in (110) direction, as well as three compact islands with 4, 5, and 9 adatoms (I4, I5, and I9). The moments of the dimers are in general reduced by the interaction in comparison to the moments of single adatoms. In most cases both a ferromagnetic and an antiferromagnetic configuration exist, with the ferromagnetic one being more stable at the end and the antiferromagnetic one at the beginning of the series. For the linear chains quite large moments are obtained, but the behavior with size is nonregular. The large moments obtained for all four chain structures indicate that also infinite chains of these atoms should show appreciable moments. For compact islands (I4, I5, and I9) the hybridization effects within the cluster are even larger. For Ag(001) we find only appreciable moments for the Ru and Rh nanostructures. © 1996 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.361530
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