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O: Fachverband Oberflächenphysik

O 51: Nanostructures at Surfaces: 1D and 2D Structures and Networks

O 51.5: Poster

Dienstag, 21. März 2017, 18:30–20:30, P1C

Spin related transport of single molecule studied by LT-STM — •Yajie Zhang and Yongfeng Wang — Key Laboratory for the Physics and Chemistry of Nanodevices, Department of Electronics, Peking University, Beijing, China

A revolution in electronics is with the contemporary evolution of the two novel disciplines of spintronics and molecular electronics. A fundamental link between these two fields can be established using organic magnetic materials. Using a low-temperature scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS), we are able to study the single molecules under ultrahigh vacuum conditions at 4.2 /0.4 K. In this talk, we measured the magnetic properties of retinoic acid molecules, FePc and DyPc2 adsorbed on metal surface with corresponding spin carries of 2s, 3p, and 4f electrons. Unlike the pre-existing metal ion in FePc or DyPc2, retinoic acid molecules can be switched reversibly to a special state by placing the tip over the neck of the bulky heads at an appropriate sample voltage. The generation of a stable cationic radical makes the molecule have an unpaired electron. The dI/dV spectrum confirms the appearance of spin in switched states. In addition, we proposed that the two Pc ligands in the same double-decker DyPc2 molecules molecule rotate by 45 degrees against each other, which can be directly deduced from the STM imaging.