Regensburg 2010 – scientific programme
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O: Fachverband Oberflächenphysik
O 76: Nanostructures at surfaces: Wires, tubes
O 76.2: Talk
Thursday, March 25, 2010, 15:15–15:30, H38
Morphology and electronic properties of Co nanorods on Cu(110)-p(2x3)N — •Sebastian Wedekind1, Fabio Donati1, 2, Hirofumi Oka1, Guillemin Rodary1, Dirk Sander1, and Jürgen Kirschner1 — 1Max-Planck-Institut für Mikrostrukturphysik, Halle, Germany — 2NEMAS, Politecnico di Milano, Milano, Italy
Copper nitride systems are of high current interest in nanoscience as they offer a venue towards decoupling the electronic properties of nanostructures or adatoms from those of the substrate. We have prepared a Cu(110)-p(2x3) (Cu3N) substrate by N-ion bombardment (600 eV, 30 min, 550 K) of clean Cu(110) [1]. Deposition of Co leads to the formation of several ten nm long Co wires, extending along [1-10]. Our scanning tunneling microscopy and spectroscopy studies at 8 K reveal the positions of all atoms within the rectangular surface unit cell, where we measure unit vectors of 1.094 and 0.502 nm for the Cu3N structure. Surprisingly, spectroscopy on clean Cu3N and on Co nanowires on Cu3N shows very similar results. No special spectroscopic features are identified near the Fermi energy, but peaks at +1.8 and +3.5 eV of presently unknown electronic character of the unoccupied sample states are observed for both Cu3N and Co/Cu3N. This suggests a rather strong electronic coupling between substrate and nanowire, questioning the electronic decoupling between this copper nitride system and nanostructures deposited on top. [1] X. Ma, D. Bazhanov, O. Fruchart, F. Yildiz, T. Yokoyama, M. Przybylski, V. Stepanyuk, J. Kirschner, Phys. Rev. Lett. 102 (2009) 205503.