Berlin 2012 – scientific programme

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MA: Fachverband Magnetismus

MA 37: Joint Session "Surface Magnetism II" (jointly with O)

MA 37.10: Talk

Thursday, March 29, 2012, 12:00–12:15, EB 301

First-principles investigation of g-shifts and damping of dynamical magnetic excitations in adatoms on surfaces — •Samir Lounis¹, Antonio T. Costa², Bruno Chilian³, Alexander A. Khajetoorians³, Jens Wiebe³, Roland Wiesendanger³, and Douglas L. Mills⁴ — ¹Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, D-52425 Jülich, Germany — ²Instituto de Fisica, Universidade Federal Fluminense, 24210-340 Niteroi, Rio de Janeiro, Brazil — ³Institute of Applied Physics, Hamburg University, Jungiusstrasse 11, D-20355 Hamburg, Germany — ⁴Department of Physics and Astronomy, University of California Irvine, California, 92697 USA

Recently, spin excitations in Fe adatoms on Cu(111) and Ag(111) surfaces are probed with magnetic field dependent inelastic scanning tunneling spectroscopy[1]. The calculation of the transverse dynamical magnetic susceptibility allows to analyse the electronic signature of these excitations[2]. We show that an Fe adatom on Ag(111) surface, contrary to other atoms embedded in various lattice configurations, has a surprisingly large g-value of 3 instead of the regular value of 2.

Work supported by the HGF-YIG Programme FunSiLab – Functional Nanoscale Structure Probe and Simulation Laboratory (VH-NG-717).

[1] A. A. Khajetoorians et al., Phys. Rev. Lett. 106, 037205 (2011); B. Chilian et al., Arxiv:1108.2443

[2] S. Lounis et al., Phys, Rev, Lett. 105, 187205 (2010); S. Lounis et al., Phys. Rev. B 83, 035109 (2011)