Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 100: Organic electronics and photovoltaics

O 100.1: Vortrag

Freitag, 18. März 2011, 11:15–11:30, WIL B122

Spin-resolved photoemission study of the interface of transition metal phthalocyanines (CuPc, FePc, CoPc) on Co(100) — •Anna Altenhof, Felix Schmitt, Michael Vogel, Stefan Lach, and Christiane Ziegler — Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, 67663 Kaiserslautern, Germany

Because of their unpaired electrons the three transition metal phthalocyanines (MePcs) CuPc, FePc and CoPc are promising candidates for the development of molecular spintronics devices based on organic-inorganic hybrid systems. For these future devices the injection of spin-polarized electrons is necessary. Therefore the interface between a ferromagnetic contact material and the organic layer plays a major role for the performance of the device.

In this study the electronic and magnetic properties of the interface between the ferromagnetic cobalt and the metal-organic molecules CuPc, FePc and CoPc were investigated by different means of ultraviolet photoelectron spectroscopy (UPS). Ultrathin MePc films were grown in situ on Co(100) under ultra high vacuum conditions. These were studied by spin-integrated and spin-resolved UPS. Linear dichroism with unpolarized light was used to examine the valence band structure. These studies show that all molecules interact with the cobalt substrate so that new states occur which are located at the interface. They also show that the interaction of FePc and CoPc with the Co substrate is similar to each other but differs from the interaction of CuPc with Co.