Berlin 2012 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 52: Poster II - Magnetic Heusler compounds, Magnetic shape memory alloys, Thin Films, Micro-/Nano-structured magnetic materials, Graphene, Spins in organics, Magnetic imaging, Surface Magnetism, Spin excitations/Torque, Spincaloric transport

MA 52.48: Poster

Freitag, 30. März 2012, 11:00–14:00, Poster A

Complex magnetic ground states observed in Fe nanostructures on different Ir surfaces — •Matthias Menzel¹, Kirsten von Bergmann¹, Stefan Heinze², Yuriy Mokrousov³, Gustav Bihlmayer³, Jessica Bickel¹, Jens Brede¹, Robert Wieser¹, Elena Vedmedenko¹, Stefan Blügel³, André Kubetzka¹, 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

The reduced symmetry and large spin-orbit interaction can give rise to complex magnetic ground states in 3d-transition metal nanostructures on heavy element surfaces, e.g. [1]. Especially, Fe nanostructures on an Ir surface are promising candidates for non-collinear magnetic states, due to an extremely weak Heisenberg exchange [2].

Here, we present SP-STM measurements of Fe chains on the (5×1)-Ir(001) surface as well as the Fe monolayer on Ir(111) which reveal atomic-scale, non-collinear magnetic ground states in both systems [3,4]. Density functional theory calculations show that the weak Heisenberg exchange allows other interactions, as the Dzyaloshinskii-Moriya exchange or higher-order interactions, to dominate the energy landscape.

[1] M. Bode et al., Nature 447, 190 (2007).

[2] B. Hardrat et al., PRB 79, 094411 (2009).

[3] S. Heinze et al., Nature Physics 7, 713 (2011).

[4] M. Menzel et al., submitted.