Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 56: Oxide Surfaces I
O 56.5: Vortrag
Mittwoch, 13. März 2013, 17:00–17:15, H45
Dynamic behavior of anti-phase boundaries in the layer-by-layer growth of Fe3O4(111)/Pt(111) thin films — Alessandro Sala, Helder Marchetto, •Thomas Schmidt, and Hans-Joachim Freund — Fritz-Haber-Institut, Abt. CP, 14195 Berlin
The transition-metal oxide Fe3O4 (magnetite) has a wide range of applications in heterogeneous catalysis and magnetism. The kind of preparation influences the film properties; in particular, anti-phase boundaries, i.e. dislocations and rotational domain boundaries, play an active role for the anomalous film resistivity and magnetic susceptibility, and could be a considerable factor in the determination of surface electronic properties. A new preparation recipe has been applied to study in-situ and in-real-time the layer-by-layer growth of a complete Fe3O4(111) film on Pt(111) with the SMART, the aberration-corrected energy-filtered LEEM/PEEM installed at BESSY II in Berlin. In addition to the usual atomic steps, the oxide surface shows new line defects, which can be interpreted as line dislocations. Furthermore, dark field imaging of the Fe3O4 surface visualize domains rotated by 180∘ against each other. The formation of the dislocations and the rotations domains and their behavior during growth and annealing are discussed.