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We study the magnetic properties of small Mn ring shaped clusters on aPt(111) surface in the framework of density functional theory. We find that theMn atoms possess large magnetic moments, of the order of 4uB/atom, and havedominating antiferromagnetic interatomic exchange interactions. A quantumconfinement effect within the ring like clusters was found, indicating thateven very small clusters can be seen as quantum corrals. The antiferromagneticexchange couplings lead to collinear magnetic arrangements in simple corrals,as well as complex non-collinear ordering, as vortex-like structures, for thecase of corrals with particular geometry where antiferromagnetism becomesfrustrated.

From collinear to vortex magnetic structures in Mn corrals on Pt(111)