Berlin 2008 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 29: Nanoengineered Thin Films
DS 29.3: Vortrag
Donnerstag, 28. Februar 2008, 18:30–18:45, H 2013
Self-assembled Fe nanowires on (2x3)N-induced Cu(110) surface — •Xiaodong Ma1, Dmitri Bazhanov1, Fikret Yildiz1, Marek Przybylski1, Valeriy Stepanyuk1, Toshihiko Yokoyama2, and Jürgen Kirschner1 — 1Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle, Germany — 2Institute for Molecular Science, Okazaki, 444-8585 Aichi, Japan
Nanometer-scale structures are of a great interest due to their potential applications in electronics. They can be grown on reconstructed (110) surfaces. A single layer of a copper nitride template was prepared on a single-crystalline Cu(110) surface by bombardment of nitrogen at elevated temperature. Room temperature scanning tunneling microscopy (STM) images with atomic resolution have clearly revealed a surface reconstruction showing a regular (2x3) periodicity, which was also confirmed by the low energy electron diffraction (LEED) pattern. After depositing Fe by molecular beam epitaxy (MBE) on the (2x3)N/Cu(110) template Fe nanowires were formed. STM images of the nanowires show their orientation along the [1-10] direction with a uniform width of 1.08 nm (which corresponds to three atomic distances along the [100] direction) and of monolayer height. The minimum separation distance between the nanowires is found to be exactly twice the periodicity of the template along [100]. When the coverage increases to a value above 0.5 ML double layer nanowires start form. Ab initio calculations were performed in order to understand the template reconstruction and the principles of the nanowire growth behaviour.