Tetrairon(III) Single Molecule Magnet Studied by Scanning Tunneling Microscopy and Spectroscopy

ORAL

Abstract

Tetrairon(III) single-molecule magnet (SMM) on a clean Au(111) has studied using scanning tunneling microscopy (STM) and spectroscopy (STS) to understand quantum mechanical tunneling of magnetization and hysteresis of pure molecular origin. Before the STM studies, elemental analysis, proton nuclear magnetic resonance (NMR) measurement and Energy Dispersive X- ray Spectroscopy (EDS) were carried out to check the robustness of the sample. The STM image of this molecule shows a hexagonal shape, with a phenyl ring at the center and surrounding six dipivaloylmethane ligands. Two peaks are observed at 0.5 eV, 1.5 eV in the STS results, agreeing well with the first principles calculations. Spin-polarized scanning tunneling microscopy (SPSTM) measurements have been performed with a magnetic tip to get the magnetization image of the SMM. We could observe the antiferromagnetic coupling and a centered- triangular topology with six alkoxo bridges inside the molecule while applying external magnetic fields.

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Authors

  • Youngtek Oh

    Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea

  • Hogyun Jeong

    Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea

  • Minjun Lee

    Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea

  • Jeonghoon Kwon

    Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea

  • Jaejun Yu

    Department of Physics \& Astronomy, Seoul National University, Korea, Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea

  • Shariful Islam Mamun

    Department of Chemistry, Kongju National University, Chungnam 314-701, Korea

  • Gajendra Gupta

    Department of Chemistry, Kongju National University, Chungnam 314-701, Korea

  • Jinkwon Kim

    Department of Chemistry, Kongju National University, Chungnam 314-701, Korea

  • Young Kuk

    Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea