Dresden 2011 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 12: Magnetic Particles/ Clusters II
MA 12.5: Vortrag
Montag, 14. März 2011, 18:00–18:15, HSZ 103
SP-STM study of bi-atomic Fe chains on (5×1)-Ir(001) — Matthias Menzel1, Yuriy Mokrousov2, Robert Wieser1, Kirsten von Bergmann1, Elena Vedmedenko1, Stefan Blügel2, Stefan Heinze3, •Andre Kubetzka1, and Roland Wiesendanger1 — 1Institut für Angewandte Physik, Universität Hamburg, 20355 Hamburg — 2Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich — 3Institut für Theoretische Physik und Astrophysik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel
The magnetism of one-dimensional structures on surfaces has been a fascinating topic of recent theoretical research, but experimental investigations have struggled with difficulties, e.g. the low amount of magnetic material or the problem of surface intermixing [1].
Here we utilize the self organization of Fe atoms on the (5×1)-reconstructed Ir(001) surface to prepare bi-atomic Fe chains [2]. Scanning tunneling microscopy was performed at T = 8 K using spin-sensitive Cr and Fe coated W tips. We observe no magnetic contrast in zero magnetic field, while in fields applied perpendicular to the surface the chains exhibit a periodic pattern along their axis with a wavelength of three inter-atomic distances. In agreement with density functional theory calculations and Monte Carlo simulations we can show that the magnetic ground state of the Fe chains is a 120∘ spin-spiral which is stabilized in external fields while it fluctuates in zero field.
[1] D.H. Wei et al. Phys. Rev. Lett. 103, 225504 (2009).
[2] L. Hammer et al. Phys. Rev. B 67, 125422 (2003).