Dresden 2026 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 28: Oxide and insulator surfaces: Structure, epitaxy and growth – Poster
O 28.4: Poster
Montag, 9. März 2026, 18:00–20:00, P2
Epitaxy of ultrathin α-Fe2O3(0001) and Fe3O4(111) on α-Al2O3(0001) — •Hanna Laguta, Tobias Pollenske, Chris Schröder, Luis Witte, Felix Johannsmann, and Joachim Wollschläger — Inst. of Physics, Univ. Osnabrück, Barbarastr. 7, 49076 Osnabrück, Germany
Iron oxides have a lot of technological applications and occur in magnetic, catalytic or electronic devices. Fe3O4 (magetite) and α-Fe2O3 (hematite) belong to the most stable iron oxides which can be found in nature.
Hematite is antiferromagnetic and has a lot of potential to be used for magnetic data storage. Thus it is of interest to study ultrathin hematite films. In this work, on the one hand α-Fe2O3 was grown directly onto the α-Al2O3(0001)-substrate using MBE. On the other hand Fe3O4 was deposited first to be oxidised to hematite in a second step. The magnetite films underwent exposures of oxygen between 6· 10−3 mbar·s and 180· 10−3 mbar·s, one sample was oxidised step-by-step.
The samples were respectively investigated using Soft and Hard X-ray Photoelectron Spectroscopy to determine the stoichiometries of near-surface and subsurface regions. Low Energy Electron Diffraction is used to determine the surface structure of the ultrathin oxide films and to distinguish hematite (α-Fe2O3) from maghemite (γ-Fe2O3) films. Additional measurements using SQUID provide insight into the magnetic properties of the samples.
Keywords: iron oxide; LEED; XPS; SQUID; HAXPES