Dresden 2014 – scientific programme
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O: Fachverband Oberflächenphysik
O 36: Posters: Bio/organic Molecules on Surfaces, Graphene, Solid/liquid interfaces, Metal Substrates, Electronic Structure Theory
O 36.80: Poster
Tuesday, April 1, 2014, 18:30–22:00, P1
Antiferromagnetic coupling in Mn2 on Ag(111) induced by H attachment — •Torsten Sachse1,2, Nicolas Néel1,3, Richard Berndt3, Werner Hofer2, and Jörg Kröger1 — 1Institut für Physik, Technische Universität Ilmenau, D-98693 Ilmenau — 2Stephenson Institute for Renewable Energy, University of Liverpool, Liverpool L69 3BX, Britain — 3Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel
Manganese dimers on Ag(111) are investigated with scanning tunneling microscopy (STM) and density functional calculations. Two species of dimers coexist that differ in their apparent height and the absence or presence of submolecular structure. These species can be interconverted by electron and hole injection from the microscope tip. Calculations identify the two kinds of dimers as pristine Mn2 and Mn2H and show that hydrogen attachment to Mn2 leads to marked changes in the dimer electronic and magnetic structure. Simulated constant-current STM images are in good agreement with the experimental data. The calculations further reveal an antiferromagnetic coupling of Mn magnetic moments in Mn2H.