Regensburg 2010 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 25: Surface Magnetism / Magnetic Imaging I
MA 25.6: Vortrag
Donnerstag, 25. März 2010, 11:30–11:45, H23
Non-collinear magnetism in monatomic transition-metal chains — •Franziska Schubert1, Paolo Ferriani1,2, Yuriy Mokrousov3, and Stefan Heinze1,2 — 1Institute of Applied Physics, University of Hamburg, Jungiusstr. 11, 20355 Hamburg — 2Institute of Theoretical Physics and Astrophysics, University of Kiel, Leibnizstr. 15, 24098 Kiel, Germany — 3Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich, Germany
Recent advances in experimental techniques allow the creation of one-dimensional transition-metal nanostructures on surfaces by self-assembly [1] or by atom manipulation with an STM tip [2]. Here, we used density functional theory calculations based on the full-potential linearized augmented plane wave (FLAPW) method to study the possibility of non-collinear magnetism in monatomic 3d transition-metal chains. We first focus on freestanding Mn and Fe chains as a function of the interatomic spacing. While Fe chains remain ferromagnetic independent of interatomic distance, Mn chains possess spin-spiral ground states in a broad regime of lattice constants. Therefore, we investigated Mn chains on the (110)-surfaces of Cu, Pd, Ag, and NiAl. We demonstrate that the chain-surface hybridization is sufficient to dramatically change the magnetic coupling in the chain. Nevertheless, a non-collinear magnetic ground state is found for Mn chains on Cu(110) and Ag(110).
[1] P. Gambardella et al., Nature 416, 301 (2002)
[2] C. Hirjibehedin et al., Science 312, 1021 (2006)