Dresden 2011 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 63: Poster II (Surface Magnetism/ Magnetic Imaging/ Topological Insulators/ Spin Structures and Magnetic Phase Transitions/ Graphene/ Magnetic Thin Films/ Magnetic Semiconductors/ Magnetic Half-metals and Oxides/ Spin-dependent Transport/ Spin Excitations and Spin Torque/ Spin Injection and Spin Currents in Heterostructures/ Spintronics/ Magnetic Storage and Applications)

MA 63.3: Poster

Freitag, 18. März 2011, 11:00–14:00, P2

Structure and magnetic properties of metal-TCNQ charge transfer networks on Ag(100) and Au(111) — •Nasiba Abdurakhmanova, TzuChun Tseng, Nan Jiang, Alexander Langner, Sebastian Stepanow, and Klaus Kern — MPI for Solid State Research, Stuttgart, Germany

Charge transfer networks of TCNQ with Ni and Mn on Ag(100) and Au(111) were investigated using Scanning Tunneling Microscopy (STM) and X-Ray Magnetic Circular Dichroism. STM reveals a diversity of structures for both Ni(TCNQ)x and Mn(TCNQ)x networks on Ag(100) that can be tuned by the x=TCNQ:Metal ratio, whereas on Au(111) only one type of network with x=1 was found. The fourfold coordinated Mn exhibits a high-spin d5 configuration and shows potential antiferromagnetic coupling between the Mn atoms. In contrast to Mn, Ni centers couple ferromagnetically. The electronic state is ascribed to a high-spin d8 configuration on Au(111), whereas Ni has predominant d9 character in the networks on Ag(100). The results are related to the different charge transfer modes of TCNQ present on the Ag and Au substrates.