Regensburg 2010 – scientific programme
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MA: Fachverband Magnetismus
MA 31: Surface Magnetism / Magnetic Imaging II
MA 31.2: Talk
Thursday, March 25, 2010, 15:30–15:45, H23
Non-collinear groundstate in the Fe monolayer on Ir(111) — •Matthias Menzel1, Stefan Heinze2, Kirsten von Bergmann1, Gustav Bihlmayer3, André Kubetzka1, Stefan Blügel3, and Roland Wiesendanger1 — 1Institut für Angewandte Physik, Universität Hamburg, 20355 Hamburg — 2Institut für Theoretische Physik und Astrophysik, Universität Kiel, 24098 Kiel — 3Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich
Various complex magnetic groundstates have been observed recently [1,2,3], which depend crucially on the interplay of different magnetic interactions like exchange interaction, magnetocrystalline anisotropy or Dzyaloshinskii-Moriya (DM) interaction. Some uniaxial spin-spirals have been found [1,2] but a two dimensional non-collinear lattice has not been observed yet.
Using spin-polarized scanning tunneling microscopy we revisited the Fe monolayer on Ir(111). With an out-of-plane magnetized tip this system exhibits a quadratic magnetic unit cell on the hexagonal atomic lattice [3]. Recent measurements with an in-plane magnetized tip reveal that this magnetic configuration is indeed a two dimensional non-collinear groundstate. The driving force for the formation of this complex groundstate has been identified by density functional theory calculations as the 4-spin interaction, a higher order magnetic interaction.
[1] M. Bode et al., Nature 447, 190 (2007)
[2] P. Ferriani et al., Phys. Rev. Lett. 101, 027201 (2008)
[3] K. von Bergmann et al., Phys. Rev. Lett. 96, 167203 (2006)