Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 37: Metal substrates: Adsorption of organic / bio molecules V
O 37.5: Vortrag
Mittwoch, 25. März 2009, 16:00–16:15, SCH A118
Magnetic adatoms confined in L-methionine biomolecular nanogratings: from atomic diffusion to adatom self-alignment — •Agustin Schiffrin1,2, Joachim Reichert2, Willi Auwärter2, Gesine Jahnz1, Yan Pennec1, Alexander Weber-Bargioni1, Valeri S. Stepanyuk3, Larissa Niebergall3, Patrick Bruno3,4, and Johannes V. Barth2 — 1Chemistry Department, University of British Columbia, Vancouver, Canada — 2Physik Department, TU München, Germany — 3MPI für Mikrostrukturphysik, Halle, Germany — 4ESRF, Grenoble, France
We exploit the self-assembly properties of the L-methionine amino acid on Ag(111) to steer the one-dimensional ordering of cobalt and iron adatoms. Our low-temperature scanning tunneling microscopy observations reveal how the individual adatoms spontaneously self-align with a preferred ∼25 Å next-neighbor spacing in the self-assembled biomolecular nanogratings. For Co strings the pertaining equilibrium statistics and dynamics were monitored to assess the underlying long-range interactions with their anisotropic energy landscape. The effect of the surface-state electron quantum confinement on the atomic self-alignment is revealed by scanning tunneling spectroscopy (STS) mapping and ab initio calculations. Also, the influence of this electronic quantum confinement on the LDOS Kondo signature of the magnetic Co adatoms is assessed with STS measurements.
[1] A. Schiffrin et al., Phys. Rev. B 78, 035424 (2008).