Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 55: Surface magnetism II (jointly with MA)
O 55.4: Vortrag
Mittwoch, 16. März 2011, 15:45–16:00, CHE 184
Itinerant Nature of Atom-Magnetization Excitation by Inelastic Scanning Tunneling Spectroscopy — Alexander Khajetoorians1, Samir Lounis2, Bruno Chilian1, Antonio Costa3, Lihui Zhou1, Douglas Mills2, Sergej Schuwalow4, Frank Lechermann4, •Jens Wiebe1, and Roland Wiesendanger1 — 1Institute of Applied Physics, Hamburg University, Germany — 2Department of Physics and Astronomy, University of California Irvine, USA — 3Instituto de Física, Universidade Fedeal Fluminense, Niterói, Brazil — 4I. Institute for Theoretical Physics, Hamburg University, Germany
We have performed single-atom magnetization curve (SAMC) measurements [1] and inelastic scanning tunneling spectroscopy (ISTS) on Fe atoms adsorbed on a semiconducting [2] and a metallic substrate [3]. ISTS reveals magnetization excitations whose lifetime strongly depends on the type of substrate. In the semiconducter case the lifetime is relatively long. In the metallic case the lifetime decreases upon application of a magnetic field and the SAMCs show a broad distribution of magnetic moments. The experimental observations are quantitatively explained by the decay of the magnetization excitation into Stoner modes of the itinerant electron system as shown by newly developed theoretical modeling [3].
[1] F. Meier et al., Science 320, 82 (2008).
[2] A. A. Khajetoorians et al., Nature 467, 1084 (2010).
[3] A. A. Khajetoorians et al., arXiv:1010.1284v2.