Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 51: Oxides and insulators: Epitaxy and growth

O 51.4: Vortrag

Mittwoch, 28. März 2012, 17:30–17:45, HE 101

LEEM/LEED investigation of Fe3O4 thin film growth on a Pt(111) substrate — •Thomas Schmidt, Alessandro Sala, Helder Marchetto, Hagen Klemm, Francesca Genuzio, Shamil Shaikhutdinov, and Hans-Joachim Freund — Fritz-Haber-Institut, Abt. CP, 14195 Berlin

The formation of the Fe3O4 film has been observed in-situ and in real-time by LEEM and LEED, with preparation conditions that differs respect to the established recipe [1]. It has been revealed that an oxidation temperature of 1000 K leads to a dewetting of the magnetite film and the formation of FeO domains upon the step bunches of the Pt(111) surface. A new recipe has been tested for the formation of the thin film: by using a closed magnetite film formed with the canonical recipe as a template, the deposition of Fe at high temperature (above 850 K) and in an O2 atmosphere allows the formation of a more flat and regular thin film, that shows also particular surface structures. By changing in real-time the deposition and oxidation conditions, the film shows different surface structures and reconstructions, detected both in LEEM and LEED. The characterization of these surface phases is discussed. [1] W. Weiss and M. Ritter, Phys. Rev. B 59, 5201 (1999)