Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 60: [MA] Joint Session "Surface Magnetism II" (jointly with O)
O 60.6: Vortrag
Donnerstag, 29. März 2012, 10:45–11:00, EB 301
Controlling the spin and the magnetic coupling of adsorbed molecules by on-surface coordination chemistry — •Christian Wäckerlin1, Kartick Tarafdar3, Dorota Chylarecka1, Jan Girovsky1, Tatjana Hählen1, Cristian Iacovita4, Armin Kleibert2, Frithjof Nolting2, Thomas A. Jung1, Peter M. Oppeneer3, and Nirmalya Ballav5 — 1Laboratory for Micro- and Nanotechnology and — 2Swiss Light Source, Paul Scherrer Institute, Switzerland — 3Department of Physics and Astronomy, Uppsala University, Sweden — 4Department of Physics, University of Basel, Switzerland — 5Department of Chemistry, Indian Institute of Science Education and Research, India
The chemical and magneto-electronic interaction of metalloporphyrins with axial ligands has been investigated for the specific case where the paramagnetic molecules [1] are supported on ferromagnetic substrates. Specifically, nitric oxide (NO) can coordinate to the porphyrin center and compete with the surface ligand in its influence of the structural and electronic integrity of the porphyrin [2]. The coordination of NO (S=1/2) with Co(II) (S=1/2) [3], Fe(II) (S=1) and Mn(II) (S=5/2) tetraphenyl porphyrins on ferromagnetic Ni or Co thin film substrates is analyzed by combining X-ray magnetic circular dichroism (XMCD), scanning tunneling microscopy (STM) and density functional theory + additional Hubbard U interaction (DFT+U) calculations.
[1] A. Scheybal et al, Chem Phys Lett 411, 214 (2005). [2] W. Hieringer et al, J Am Chem Soc 133, 6206 (2011). [3] C. Wäckerlin et al, Nat Comms 1:61 (2010).