Berlin 2024 – scientific programme
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O: Fachverband Oberflächenphysik
O 67: Poster: Oxide, Insulator and Semiconductor Surfaces
O 67.5: Poster
Wednesday, March 20, 2024, 18:00–20:00, Poster C
Initial stages of epitaxial growth of Fe3O4 films on SrTiO3(111) — •Luis Witte, Tobias Pollenske, and Joachim Wollschläger — Institute of Physics, University of Osnabrück, Barbarastrasse 7, 49076 Osnabrück, Germany
Magnetite films hold promising perspectives in spintronics as, e.g., MRAM (Magnetic Random Access Memory) devices. MRAMs, based on magnetic tunnel junctions, promise non-volatile storage with improved energy efficiency and extended battery life for electronic devices. The ferromagnetism-controlled spin polarization of electrons in magnetite enables precise switching operations. Specific adjustments to the layer properties can be achieved by selectively varying the deposition temperature.
In this study, ultrathin Fe3O4 layers were deposited on SrTiO3 (111) using reactive molecular beam epitaxy evaporating in 5 · 10−6mbar O2 with deposition temperatures from 200∘C to 600∘C. The focus of this work is on the temperature-dependent growth modes of magnetite during the initial stages of growth. LEED and XPS measurements were conducted after each step to gain insights into the structural and chemical compositions of the magnetite layers within the first monolayers. Upon completion of the growth process, additional XRR and (HE)XRD measurements were performed to obtain information about the structure and final thickness of the film.
Keywords: Magnetite; SrTiO3 (111); RMBE; LEED; XPS