Imperfect magnetic nanostructures on a Ag(001) surface

Ab initio calculations are presented for magnetic properties of small islands of $3d,$ $4d,$ and $5d$ adatoms on the Ag(001) surface, intermixed with Ag substrate atoms. We show that the intermixing of small $4d$ and $5d$ clusters can lead to an unexpected enhancement of the local moments and is very different from the intermixing behavior found in the monolayer regime.