Berlin 2015 – scientific programme
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O: Fachverband Oberflächenphysik
O 2: Surface Magnetism and Spin Phenomena
O 2.3: Talk
Monday, March 16, 2015, 11:15–11:30, MA 004
Conduction-electron mediated Dzyaloshinskii-Moriya interactions between adatoms revealed by ISTS — Alexander A. Khajetoorians1,2, Manuel Steinbrecher1, Mohammed Bouhassoune3, Manuel dos Santos Dias3, Samir Lounis3, Markus Ternes4, •Jens Wiebe1, and Roland Wiesendanger1 — 1Institut für Nanostruktur- und Festkörperphysik, Universität Hamburg, 20355 Hamburg, Germany — 2Institute for Molecules and Materials, Radboud University, 6525 AJ Nijmegen, The Netherlands — 3Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany — 4Max-Planck Institut für Festkörperphysik, 70569 Stuttgart, Germany
It is known since more than three decades that anisotropic exchange between magnetic impurities mediated via strong spin-orbit scattering of conduction electrons by nonmagnetic host atoms leads to a term in the RKKY interaction which is of the Dzyaloshinskii-Moriya (DM) type [1,2]. We report the first direct experimental distance-dependency study of this interaction in pairs of an Fe-H2 Kondo-complex and an Fe atom adsorbed on Pt(111) by inelastic scanning tunneling spectroscopy (ISTS) showing that the DM exchange is of similar strength as the isotropic exchange. The data is analysed by a model including the coupling to the substrate electrons in third order perturbation theory [3] and is affirmed by our first-principles calculations using the KKR method [4]. [1] A. Fert et al., PRL 44, 1538 (1980); [2] S. Lounis et al., PRL 108, 207202 (2012); [3] Y.-H. Zhang et al., Nat. Comm. 4, 127203 (2013); [4] L. Zhou et al., Nat. Phys. 6, 187 (2010).