Regensburg 2013 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 32: Poster Session IV: Atomic layer deposition; Organic thin films; Organic Electronics and Phototovoltaics; Organic Materials for Spintronics - from spinterface to devices; Thin film photovoltaic materials and solar cells
DS 32.41: Poster
Donnerstag, 14. März 2013, 17:00–20:00, Poster B2
Spin properties of the interface between cobalt and metal-quinolines — •Sabine Steil1, Andrea Droghetti2, Nicolas Großmann1, Stefano Sanvito2, Mirko Cinchetti1, and Martin Aeschlimann1 — 1Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, 67663 Kaiserslautern, Germany — 2School of Physics and CRANN, Trinity College Dublin, 2, Irland
In metallorganic complexes it is expected that the metal atom plays a central role in determining the molecule electronic structure and thus the magnetic properties of hybrid interfaces formed with ferromagnetic metals. This is well known in the case of metal-phthalocyanines (MPc). In fact, recent experiments [1] have demonstrated that strong changes in the spin polarization of the MPc/cobalt interface can be induced by properly choosing the central metal atom. This is a fundamental knowledge for the design of future organic spintronics devices. As aluminium quinoline (Alq3) is a prominent molecular candidate used in spin-valve systems [2], we investigated the effect of substituting the Al atom with either gallium or indium. The electronic structure of the molecules as well as the properties of the interfaces formed with ferromagnetic cobalt were study both, experimentally, by using different photoemission spectroscopy methods and, theoretically, with density functional theory calculations. The results will be discussed focusing on the application of different quinolines in spin-valve devices.
[1] S. Lach et al. Advanced functional Materials 22, 989 (2011)
[2] V. A. Dediu et al., Nature Mater. 8, 707 (2009)