Dresden 2017 – scientific programme
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MA: Fachverband Magnetismus
MA 22: Surface Magnetism (Joint Session with O)
MA 22.10: Talk
Tuesday, March 21, 2017, 12:15–12:30, HSZ 401
Adsorption of pyrene molecules on Fe/W(110) — •S. Schleicher1, J. Rawson2, F. Matthes1, D. E. Bürgler1, P. Kögerler2, and C. M. Schneider1 — 1Peter Grünberg Institut (PGI-6), Forschungszentrum Jülich — 2Institute of Inorganic Chemistry, RWTH Aachen University
The chemisorption of aromatic molecules on transition metal surfaces is governed by strong hybridization of molecular π-orbitals with spin-split d-orbitals of the substrate. The resulting spin-imbalanced molecular density of states yields an induced molecular magnetic moment for strong and spin-filter properties for weak coupling [1], respectively. We study conventional pyrene molecules as a precursor for pyrene-based double-decker molecules by spin-polarized scanning tunneling microscopy/spectroscopy (SP-STM/STS) at 4 K to investigate the adsorption and hybridization properties. Molecules are deposited in UHV at room temperature, and two atomic layers of Fe on W(110) serve as ferromagnetic substrate with perpendicular magnetization. STM images reveal that the molecules remain intact upon deposition and adsorb in a flat and unique geometry. At higher coverages they self-assemble in ordered arrays. STS data reveal broad, band-like features indicating strong molecule-surface hybridization. The well-defined adsorption geometry and the strong hybridization are key requirements for the observation of spin-filtering in double-decker molecules.
[1] K.V. Raman et al., Nature 493, 509 (2013).