Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 63: Posters: Scanning Probe Methods
O 63.2: Poster
Mittwoch, 2. April 2014, 17:30–21:00, P2
Manipulating the magnetic properties of a single atom by controlled hydrogenation — Alexander Ako Khajetoorians1, Tobias Schlenk1, Manuel Steinbrecher1, Maria Valentyuk2, Benedikt Schweflinghaus3, Manuel dos Santos Dias3, Mohammed Bouhassoune3, Samir Lounis3, Alexander Lichtenstein2, •Jens Wiebe1, and Roland Wiesendanger1 — 1Institute of Applied Physics, Hamburg University — 2I. Theoretical Institute of Physics, Hamburg University — 3Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich & JARA
Utilizing a combination of inelastic scanning tunneling spectroscopy and first-principles calculations within density functional theory, we describe how the magnetic properties of a single Fe atom on Pt(111) is modified by the adsorption of hydrogen. The most prominent effect of hydrogen adsorption onto a clean Fe atom is to modify the magnetic anisotropy and thereby the excitation energy. Binding site dependent studies as a function of the number of adsorbed hydrogen atoms shows that hydrogenation favors out of plane magnetic anisotropy. For the case of the hcp adatom, where the clean adatom has an easy plane anisotropy, full hydrogenation leads to significant Kondo screening. Magnetic field and temperature dependent studies of the Kondo resonance confirm a Kondo temperature of a few Kelvin. We further illustrate, by tip induced desorption, that we can controllably reverse the magnetic properties of these Fe hydrogen complexes. These conclusions are corroborated by calculations of hydrogenation-induced modifications in the relaxation and band structure.