The Korringa-Kohn-Rostoker Green (KKR) function method for non-collinear magnetic structures was applied on Mn and Cr ad-clusters deposited on the Ni(111) surface. By considering various dimers, trimers and tetramers, a large amount of collinear and non-collinear magnetic structures is obtained. Typically all compact clusters have very small total moments, while the more open structures exhibit sizeable total moments, which is a result of the complex frustration mechanism in these systems. Thus, as the motion of a single adatom changes the cluster structure from compact to open and vice versa, this can be considered as a magnetic switch, which via the local exchange field of the adatom allows to switch the cluster moment on and off, and which might be useful for future nanosize information storage.
@article{arxiv.cond-mat/0608481,
title = {Changing the Magnetic Configurations of Nanoclusters Atom-by-Atom},
author = {Samir Lounis and Phivos Mavropoulos and Rudolf Zeller and Peter H. Dederichs and Stefan Blügel},
journal= {arXiv preprint arXiv:cond-mat/0608481},
year = {2015}
}