Regensburg 2013 – scientific programme

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MA: Fachverband Magnetismus

MA 34: Surface and Interface Magnetism II (jointly with O)

MA 34.7: Talk

Thursday, March 14, 2013, 12:00–12:15, H33

Spin-resolved measurements of single molecular magnets on graphene — •Jens Brede, Maciej Bazarnik, Régis Decker, Jörg Schwöbel, and Roland Wiesendanger — Institute of Applied Physics, University of Hamburg, 20355 Hamburg, Germany

The use of magnetic molecules opens a gateway to a flexible design of novel spintronic devices to store, manipulate, and read spin information at the nanoscale. Crucial is the precise knowledge of molecular properties at the interface towards an electrode. Progress in this field relies on resolving and understanding the physics at the relevant interfaces. In particular the role of individual molecular constituents and the impact of the atomic environment on molecular properties, determine device relevant parameters, such as conductance and spin polarization. Recently, the incorporation of a graphene sheet to electronically decouple molecules from a ferromagnetic surface was addressed by surface averaging techniques.

Here, we applied spin-polarized scanning tunneling microscopy to resolve the physics of the molecule-graphene-ferromagnet interface. The analysis focuses on different phthalocyanine molecules adsorbed on cobalt intercalated graphene on Ir(111). The phthalocyanine constitutes of an organic macrocyclic ligand and can be functionalized with various metal ions in order to modify, e.g. the molecular spin state. We will discuss the spin-dependent transport from magnetic surfaces through such molecules. In particular, the spin polarizations of molecular frontier orbitals are resolved with sub-molecular spatial resolution and the variations in the lifetimes of different states are discussed.