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O: Fachverband Oberflächenphysik
O 6: Organic Molecules on Inorganic Substrates I: Electronic, Optical and other Properties
O 6.9: Vortrag
Montag, 16. März 2020, 12:45–13:00, REC C 213
Manipulation of the noble metal rare earth surface alloy DyAg2 by adsorption of organic molecules — •Eva Sophia Walther1, Johannes Seidel1, Dominik Jungkenn1, Markus Franke2,3, Ahmed Alhassanat4, Hans-Joachim Elmers4, Christian Kumpf2,3, Martin Aeschlimann1, and Benjamin Stadtmüller1 — 1Department of Physics and Research Center OPTIMAS, TU Kaiserslautern — 2Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich — 3Jülich-Aachen Research Alliance (JARA) — 4Institute of Physics, JGU Mainz
The vast requirement for novel nano-sized information technology devices has triggered the search for functional low dimensional materials with distinct spin order. A particularly interesting case is the contact of molecular complexes and surface alloys, which combines the unique functionality of molecular complexes with the spin order of surface alloys. Here, we focus on Perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) on the DyAg2 surface alloy. Alloying the topmost layer of an Ag(111) surface with Dy results in a long range ordered magnetic phase at low sample temperature. Using synchrotron-based photoemission and magnetic circular dichroism experiments we can reveal the manipulation of the electronic and magnetic properties of this surface alloy by adsorption of PTCDA. These changes of the DyAg2 surface alloy are attributed to the formation of σ-like local bonds between the molecules oxygen end groups and the Dy-alloy atoms.