Berlin 2012 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 31: Organic thin films I

DS 31.2: Vortrag

Donnerstag, 29. März 2012, 11:30–11:45, H 0111

Spectroscopic Ellipsometry and Magneto-optical Kerr Effect Spectroscopy Characterization of Phthalocyanine Thin Films on Ferromagnetic Substrates — •Michael Fronk, Francisc Haidu, Michael Ludemann, Alexander Kopylov, Christian Schubert, Manfred Albrecht, Dietrich R.T. Zahn, and Georgeta Salvan — Chemnitz University of Technology, Germany

Since many years organic complexes like phthalocyanines attract research interest due to their applicability in organic electronic devices such as OLEDs and OFETs. Already in the 1970s phthalocyanines were magneto-optically studied by means of magnetic circular dichroism (MCD) for the clarification of the electronic structure of the molecules in solution and in form of films on transparent substrates. Recently our group successfully applied the magneto-optical Kerr effect (MOKE) to measure organic films on opaque substrates [1]. However, in order to perform basic research with an eye on the application of organic complexes in spintronic devices, the challenge is to measure the magneto-optical response of dia- or paramagnetic molecules on ferromagnetic substrates with dominating signal contributions. In the present work ellipsometry is used to characterize the bare ferromagnetic substrates (LSMO and Co-Pt layered systems) as well as samples with films of CoPc and CuPc in terms of their dielectric functions. MOKE is measured at different magnetic field strengths in order to access the signal of the organic films which is the only field dependent contribution above the saturation field of the substrate.

[1] M. Fronk, et. al., Phys. Rev. B 79 (2009) 235305