Comparing XMCD and DFT with STM spin excitation spectroscopy for Fe and Co adatoms on Cu2N/Cu(100)

M. Etzkorn,1,* C. F. Hirjibehedin,2 A. Lehnert,1 S. Ouazi,1 S. Rusponi,1 S. Stepanow,3 P. Gambardella,3 C. Tieg,4 P. Thakur,4 A. I. Lichtenstein,5 A. B. Shick,6 S. Loth,7 A. J. Heinrich,8 and H. Brune1 1Institut de Physique de la Matière Condensée, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland 2London Centre for Nanotechnology, Department of Physics & Astronomy, Department of Chemistry, UCL, London WC1H 0AH, United Kingdom 3Department of Materials, ETH Zürich, Hönggerbergring 64, CH-8093 Zürich, Switzerland 4European Synchrotron Radiation Facility, B.P. 220, 38043 Grenoble, Cedex, France 5University of Hamburg, Jungiusstrasse 9, 20355 Hamburg, Germany 6Institute of Physics, ASCR, Na Slovance 2, CZ-18221 Prague, Czech Republic 7Max Planck Research Group Dynamics of Nanoelectronic Systems, Center for Free-Electron Laser Science, Luruper Chaussee 149, 22761 Hamburg, Germany 8IBM Research Division, Almaden Research Center, San Jose, California 95120, USA (Received 15 February 2015; revised manuscript received 21 September 2015; published 5 November 2015)