Berlin 2012 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 44: Joint Session "Spins in Organic Materials" (jointly with DS)
MA 44.7: Vortrag
Donnerstag, 29. März 2012, 18:15–18:30, H 1012
Metal-organic hybrid interface states of a ferromagnet/organic semiconductor hybrid junction as basis for engineering spin injection in organic spintronics — Stefan Lach1, •Anna Altenhof1, Kartik Tarafder2, Felix Schmitt1, Md. Ehesan Ali2,3, Michael Vogel1, Jens Sauther1, Peter Oppeneer2, and Christiane Ziegler1 — 1Dep. of Physics and Research Center OPTIMAS, University of Kaiserslautern, D-67663 Kaiserslautern — 2Dep. of Physics and Astronomy, Uppsala University, S-75120 Uppsala — 3Center for Theoretical Chemistry, Ruhr-University Bochum, D-44801 Bochum
Hybrid spintronic devices that combine organic semiconductors (OSC) with ferromagnetic (FM) substrates are expected to provide a route to devices with improved and new functionalities. A crucial role is played by the FM-OSC interface. State-of-the-art DFT+U calculations in combination with UPS and XPS as well as spin-resolved UPS directly demonstrate the formation of new hybrid interface states (HIS), induced by chemisorption of CuPc, CoPc, and FePc at Co [1]. Whereas FePc and CoPc have only weakly spin-polarized levels at the Fermi level, CuPc shows strong spin-polarization directly at EF. On the other hand, the interaction leads to a vanishing magnetic moment in case of CuPc and a strong ferromagnetic coupling in case of CoPc and FePc. The difference is explained by the symmetry of the d-orbitals which are massively involved in the hybridization. [1] S. Lach, A. Altenhof, K. Tarafder, F. Schmitt, Md. E. Ali, M. Vogel, J. Sauther, P. M. Oppeneer, Ch. Ziegler, Adv. Funct. Mat., in press