Berlin 2005 – wissenschaftliches Programm
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O: Oberflächenphysik
O 19: Nanostrukturen II
O 19.6: Vortrag
Samstag, 5. März 2005, 12:00–12:15, TU EB420
Grazing incidence Ar+ ion induced creation and azimuth dependent evolution of nanogrooves on Cu(001) — •Herbert Wormeester, Michael Ovsyanko, Geogiana Stoian, and Bene Poelsema — MESA+ Institute for Nanotechnology, University of Twente, Enschede, The Netherlands
Grazing incidence 800 eV Ar+ sputtering on a Cu(001) surface leads to the formation of nanogrooves in which only 3 layers are involved. With high resolution LEED we found that initially the distance between the nanogrooves L depends linearly on the sputter time: L=L0+St. Both the initial average distance L0 and a separation rate S depends on temperature. For sputtering along the [110] and [100] azimuths, a similar L0 is found while a higher slope is observed along [100]. For increased sputter time, L clearly saturates for sputtering along the [100]. Annealing experiments of initially created grooves show a similar separation rate S, indicating that this behaviour does not originate from the ion sputtering. The temporal evolution and observed saturation of the distance between the nanogrooves along both the [100] and [110] azimuth will be discussed.