Fluorinated Phthalocyanine Molecules on Ferromagnetic Cobalt: A Highly Polarized Spinterface

Spin-resolved photoemission spectroscopy experiments are performed on perfluorinated Co-phthalocyanine (F16CoPc) deposited onto ferromagnetic Co(001) to examine how doping (here with fluorine) of an organic semiconductor influences the interfacial electronic properties and whether the formation of highly spin-polarized interface states is possible. It is found that this latter property, initially reported for the nonfluorinated Pc, is also present for the fluorinated system Co/F16CoPc. This result shows that doping an organic semiconductor, which is an important and effective method to tailor the electronic transport properties of the molecules, does not inhibit the presence of a highly polarized spinterface.