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The Korringa-Kohn-Rostoker Green (KKR) function method for non-collinearmagnetic structures was applied on Mn and Cr ad-clusters deposited on theNi(111) surface. By considering various dimers, trimers and tetramers, a largeamount of collinear and non-collinear magnetic structures is obtained.Typically all compact clusters have very small total moments, while the moreopen structures exhibit sizeable total moments, which is a result of thecomplex frustration mechanism in these systems. Thus, as the motion of a singleadatom changes the cluster structure from compact to open and vice versa, thiscan be considered as a magnetic switch, which via the local exchange field ofthe adatom allows to switch the cluster moment on and off, and which might beuseful for future nanosize information storage.Comment: 7 page

Noncollinear magnetism of Cr and Mn nanoclusters on Ni(111): Changing the magnetic configuration atom by atom