Regensburg 2007 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 28: Surface Magnetism
MA 28.7: Vortrag
Donnerstag, 29. März 2007, 16:45–17:00, H23
Low-spin phase in bi-atomic chains grown on vicinal Pt(997) surfaces — •Jan Honolka1, Klaus Kuhnke1, Tae-Yon Lee1, Violetta Sessi1, Pietro Gambardella3, Sandra Gardonio2, Diego Repetto1, Axel Enders1, and Klaus Kern1 — 1Max-Planck Institute for Solid State Research, Stuttgart, Germany — 2Catalan Institute for Research and Advanced Studies, Barcelona, Spain — 3Instituto di Struttura della Materia, Trieste, Italy
For 3d metal nanostructures on surfaces, magnetic properties such as the magnetic anisotropy and the magnetic exchange interaction are strongly dependent on the symmetry of coordination as well as the hybridization with the substrate atoms. In particular Fe nanostructures on Pt surfaces are of interest due to the strong hybridization of Fe-3d and Pt-5d states leading to large magneto-crystalline anisotropy energies observed for example in FePt L10 bulk structures. In this paper we show the results of extensive X-ray magnetic circular dichroism (XMCD) measurements of in-situ grown Fe stripes, which self-assemble along the steps of Pt(997) surfaces as described elsewhere[1]. We observe a dramatic decrease of the average spin-moment between monoatomic chains and bi-chains by about a factor 4. At the same time the magnetic easy axis rotates from the in-plane to the out-of plane direction. When the stripes become even larger in width the spin-moment recovers gradually and reaches Fe bulk values at coverages of ~ 0.8ML. The results are discussed in terms of a possible antiferromagnetic coupling of the adjacent chains within the bi-chain structure depending on the interchain distance.