Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)
O 35.35: Poster
Dienstag, 27. März 2012, 18:15–21:45, Poster B
Two dimensional Rare-Earth ordered alloys — •Lucia Vitali1,2 and Enrique Ortega1,3 — 1Material Physics Center- University of Basque Country, San Sebastian (Spain) — 2Ikerbasque Foundation, Bilbao (Spain) — 3Fisica Aplicada, University of Basque Country (spain)
The reported fast magnetization/demagnetization, key features for spintronics and data storage, has raised the scientific and technological interest for thin ferromagnetic layers supported on non-magnetic metal-substrates. The physical principle behind these observations is the interaction between quasi-particles and the role of the interface. Recent work has reported on the formation of a new ordered stoichiometric alloy of GdAu2 formed by deposition of Gd atoms on Au(111) surface at high temperatures [1]. The observed layer by layer growth shows different structural, electronic and magnetic properties with respect to bulk GdAu2 structure although the stoichiometric structure is preserved. Indeed, contrary to the antiferromagnetic behaviour of this alloy as bulk material, the first two layers of GdAu2 grown on Au(111) show a ferromagnetic character [1]. Here, we report that, similarly to GdAu2, also GdAg2 and GdCu2 surface alloys can be obtained. Topographic and spectroscopic characterization of the local density of state of the three epitaxially grown surface alloys of Gd have been performed with a commercial 1K-STM. Here, the similarity and peculiarity of these surface alloys will be explained in terms of the influence of the s, p and d orbitals of the supporting substrates. [1] M.Corso, et al. PRL 105, 016101 (2010)