Ferromagnetic cobalt and iron top contacts on an organic semiconductor: Evidence for a reacted interface

The interface formation between the organic semiconductor copper-phthalocyanine and the ferromagnets Co and Fe has been investigated for the case of metal deposition onto the organic film using photoemission as well as X-ray absorption spectroscopy. Such interfaces might allow the injection of spin polarized currents into organic semiconductors. Our data reveal the formation of interfaces which are characterized by chemical reactions in the interfacial region.