Dresden 2014 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 4: Magnetic / Organic Interfaces, Spins in Organics and Molecular Magnetism (jointly with MA)
DS 4.4: Vortrag
Montag, 31. März 2014, 16:00–16:15, CHE 91
Determination of spin polarized hybridization states of C60 on a ferromagnetic Co(001) surface and its importance for spintronic applications — •Stefan Lach1, Oliver Ruden1, Anna Altenhof1, Shenwei Shi2, Mats Fahlman2, and Christiane Ziegler1 — 1Technical University of Kaiserslautern and state research centre OPTIMAS — 2Linköping University, SE-58183 Linköping, Sweden
It is both the high electron affinity resulting in small energy barriers for electron injection at the interfaces with 3d transition metal ferromagnets and its lack of hydrogen and hence no spin dephasing by hyperfine coupling, which makes C60 an important candidate for organic spintronic devices. We present the identification of spin polarized hybrid interface states (sp-HIS) for the C60/Co(001) organic-inorganic interface. Supported by IPES measurements for the unoccupied states and XPS core level spectroscopy, we will show that the also observed Interface dipoles and the spin-split can be explained by covalent bond formation associated with a p-d hybridization between the Co atoms and the C60. Our results provide further insight into the rehybridization reactions of C60 on ferromagnetic substrates beyond a simple charge transfer.This explains the observed interface dipoles and determines the spin-split behavior. The latter is of high importance for spin filtering effects at the C60/Co(001) interface and thus for spintronic devices.