Regensburg 2004 – wissenschaftliches Programm

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O: Oberflächenphysik

O 39: Epitaxie und Wachstum III

O 39.8: Vortrag

Donnerstag, 11. März 2004, 17:30–17:45, H39

Atomic structure of ultrathin Fe films on Cu(100) and Cu(111) prepared by pulsed laser deposition (PLD) — •Hannes Schiechl, Albert Biedermann, Michael Schmid, and Peter Varga — Institut für Allgemeine Physik, Technische Universität Wien, Wiedner Hauptstrasse 8-10/134, A-1040 Vienna, Austria

Ultrathin Fe films up to 10 ML were grown on Cu(100) and Cu(111) using pulsed laser deposition (PLD) and analyzed by scanning tunneling microscopy (STM). We present a survey of the local atomic structure of these films, which show enhanced layer-by-layer growth compared to films grown by thermal deposition (TD). At laser intensities near the ablation threshold we observe a bcc-like Fe phase between 2 and 5 ML film thickness on Cu(100), similar to our previous results on TD-films, where this structure can be correlated to the interesting magnetic properties of these films. Regarding Fe films grown on the Cu(111) surface using a laser wavelength of 532 nm, we observe a transition of the growth mode by increasing the laser fluence per pulse. The bilayer growth mode, which we find on TD-films, changes to layer-by-layer growth.