Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 5: Organic-inorganic hybrid systems and organic films I

O 5.5: Vortrag

Montag, 12. März 2018, 11:45–12:00, MA 042

Towards tailoring the electronic structure of ferromagnetic surface alloys by absorption of organic molecules — •Johannes Seidel1, Dominik Jungkenn1, Sina Mousavion1, Markus Franke2, Leah L. Kelly1, Lu Lyu1, Hans-Joachim Elmers3, Christian Kumpf2, Mirko Cinchetti4, Martin Aeschlimann1, and Benjamin Stadtmüller11Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, D-67663 Kaiserslautern — 2Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, D-52425 Jülich — 3Institut für Physik, Johannes-Gutenberg-Universität Mainz, D-55122 Mainz — 4Experimentelle Physik VI, Technische Universität Dortmund, D-44221 Dortmund

In this work, we extend our recent investigations [1] of organic adsorbates on surface alloys to the lanthanide-noble metal surface alloy Dy1Ag2/Ag(111). This 2D alloy is highly interesting due to the likely existence of a ferromagnetic phase at low sample temperature [2]. We present a detailed characterization of the electronic structure of the bare Dy1Ag2/Ag(111) surface alloy by momentum microscopy. The geometric structure is characterized by STM, LEED and NIXSW. We are able to identify Dy-Ag hybrid states and to reveal a significant vertical buckling of the Dy atoms. Upon the adsorption of PTCDA on Dy1Ag2, we find a clear change in the band surface of the surface alloy. These findings will be discussed in the light of the geometric modification of Dy1Ag2 surface as well as our previous findings for other surface alloys [1]. [1]PRL117, 096805(16); [2]Nano Lett. 16, 4230(16)

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