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O: Fachverband Oberflächenphysik
O 81: [MA] Surface magnetism IV
O 81.7: Talk
Thursday, March 17, 2011, 16:45–17:00, HSZ 103
Chiral spin-structure of biatomic Fe chains on Ir(001) — •Yuriy Mokrousov1, Matthias Menzel2, Robert Wieser2, Kirsten von Bergmann2, Elena Vedmedenko2, André Kubetzka2, Roland Wiesendanger2, Stefan Blügel1, and Stefan Heinze3 — 1Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany — 2Institut für Angewandte Physik, Universität Hamburg, 20355 Hamburg, Germany — 3Institut für Theoretische Physik und Astrophysik, Universität zu Kiel, 24098 Kiel, Germany
We investigate from ab initio the magnetism of biatomic Fe chains, which
form due to self-organization on the (5×1)-reconstructed Ir(001) surface [1]. Using the FLEUR code [2],
we calculate the magnetic anisotropy and exchange energies with
different exchange-correlation functionals, and find very small Heisenberg exchange interactions along the chain
of the order of 10 meV/Fe-atom.
Upon including spin-orbit coupling we obtain the contribution from the Dzyaloshinskii-Moriya interaction
and find that it leads to a 120∘ spin-spiral ground state of the Fe chains with a unique rotational
sense. The results of the Monte-Carlo
simulations based on the parameters from ab initio are in a very good agreement to STM experiments
on the system. We acknowledge funding under HGF-YIG Programme VH-NG-513.
L. Hammer et al., Phys. Rev. B 67, 125422 (2003).
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