Abstract
We report on the unusual behavior of Fe(n) clusters (n < or = 6) supported on ultrathin oxide films. When the film is grown on a Mo(001) support, the cluster magnetic moments exhibit a similar quenching as on the bare MgO(001) surface while on MgO/Fe(001) films the magnetization is enhanced due to a charge transfer from the Fe clusters to the MgO/Fe(001) interface. These results obtained using a spin-polarized density functional approach show the potential of using ultrathin films to tune the properties of supported magnetic particles.
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