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Imaging and manipulation of adatoms on an alumina surface by noncontact atomic force microscopy

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons22118

Simon,  Georg Hermann
Chemical Physics, Fritz Haber Institute, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons21628

Heyde,  Markus
Chemical Physics, Fritz Haber Institute, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons21524

Freund,  Hans-Joachim
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Zitation

Simon, G. H., Heyde, M., & Freund, H.-J. (2012). Imaging and manipulation of adatoms on an alumina surface by noncontact atomic force microscopy. Journal of Physics: Condensed Matter, 24(8): 084007. doi:10.1088/0953-8984/24/8/084007.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0010-50F0-C
Zusammenfassung
Noncontact atomic force microscopy (NC-AFM) has been performed on an aluminum oxide film grown on NiAl(110) in ultrahigh vacuum (UHV) at low temperature (5 K). Results reproduce the topography of the structural model, unlike scanning tunnelling microscopy (STM) images. Equipped with this extraordinary contrast the network of extended defects, which stems from domain boundaries intersecting the film surface, can be analysed in atomic detail. The knowledge of occurring surface structures opens up the opportunity to determine adsorption sites of individual adsorbates on the alumina film. The level of difficulty for such imaging depends on the imaging characteristics of the substrate and the interaction which can be maintained above the adsorbate. Positions of single adsorbed gold atoms within the unit cell have been determined despite their easy removal at slightly higher interaction strength. Preliminary manipulation experiments indicate a pick-up process for the vanishing of the gold adatoms from the film surface.