Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 48: Poster Session II

MA 48.30: Poster

Donnerstag, 10. März 2016, 15:00–18:00, Poster B1

Comparing XMCD and DFT with STM spin excitation spectroscopy for Fe and Co adatoms on Cu₂N/Cu(100) — •Markus Etzkorn^1,2, Cyrus F. Hirjibehedin³, Anne Lehnert¹, Safia Ouazi¹, Stefano. Rusponi¹, Sebastian Stepanow⁴, Pietro Gambardella⁴, Carsten Tieg⁵, Pardeep Thakur⁵, Alexander I. Lichtenstein⁶, Alexander B. Shick⁷, Sebastian Loth⁸, Andreas Heinrich⁹, and Harald Brune¹ — ¹EPFL, Lausanne, Switzerland — ²MPI for Solid State Research, Stuttgart, Germany — ³London Centre for Nanotechnology, UCL, United Kingdom — ⁴ETH Zürich, Zürich, Switzerland — ⁵ESRF, Grenoble, France — ⁶University of Hamburg, Hamburg, Germany — ⁷Institute of Physics, Prague, Czech Rep. — ⁸CFEL, Hamburg, Germany — ⁹IBM Almaden Research Center, San Jose, USA

We compare the magnetic properties of ensembles of single Fe and Co atoms on a Cu₂N monolayer on Cu(100) deduced from x-ray circular magnetic dichroism (XMCD) and density functional (DFT) calculations with spin excitation spectroscopy (SES) measurements on single atoms [1]. We focus in particular on the values of the local magnetic moments determined by XMCD compared to the expectation values derived from the spin Hamiltonian used to describe the SES data. Within this model we are able to understand the angular dependence of the projected magnetic moments along the magnetic field, as measured by XMCD. In agreement with DFT, the XMCD measurements show large orbital contributions to the total magnetic moment for both magnetic adatoms. [1] M.Etzkorn et al., PRB 92 (2015) 184406.