ESR-STM Spectrometer for Paramagnetic Molecular Adsorbates on Surfaces

ORAL

Abstract

ESR-STM is a technique able to detect noise at the Larmor frequency in the tunnelling current associated with the spin dynamics of a single paramagnetic center on the surface. Several questions concerning details of this phenomenon in different magnetic fields and tunnelling currents, and for different paramagnetic centers are still debated. In this paper we describe the construction and the testing of an instrument able to detect the ESR-STM signal from organic paramagnetic molecules (DPPH and BDPA) deposed on Au(111) at different magnetic fields. First results on these molecules are presented.

*Financial support from the Italian MIUR, FIRB and FISR projects, EC HPRI-CT-2000-40022 SENTINEL and MRTN CT-2003 504880 ``QuEMolNa'' and NoE ``Magmanet'' are also acknowledged. Partial support from the US-Israel binational foundation is also acknowledged.

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Authors

  • Paolo Messina

    • MSD Argonne Nat. Lab., US

  • Matteo Mannini

    • Dept. Chemistry University of Florence, Italy

  • Andrea Caneschi

  • Dante Gatteschi

  • Lorenzo Sorace

  • Paolo Sigalotti

    • ApeResearch Trieste, Italy

  • Cristian Sandrin

  • Paolo Pittana

    • Elettra Sincrotrone S.P.A. Trieste, Italy

  • Yishay Manassen

    • Bengurion University of the Negev, Israel