Scanning tunneling spectroscopy of fluorinated phthalocyanine molecules on magnetic metal surfaces

Electronic structures of fluorinated cobalt phthalocyanine molecules (CoPcF16) on cobalt films have been studied by low temperature scanning tunneling spectroscopy. The differential conductance spectra measured on a single CoPcF16 showed two peaks around the Fermi level. These electronic features are considered as adsorption-induced states caused by the interaction between the fluorinated phthalocyanine macrocycle and the Co surfaces. The CoPcF16/Co system would be a good candidate for spin-transport studies of single molecule spintronics devices because these adsorption-induced states act as a carrier- and spin-path of the devices.