Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 65: Poster Wednesday: Surface Structure, Epitaxy and Growth

O 65.6: Poster

Mittwoch, 3. April 2019, 17:45–20:00, Poster B1

Growth studies of Fe₃O₄ on SrTiO₃(001) by SPA-LEED — •Andreas Alexander, Jascha Bahlmann, and Joachim Wollschläger — Universität Osnabrück Fachbereich Physik, Barbarastr. 7, 49076 Osnabrück

Because of its electric and magnetic properties, Fe₃O₄ (Magnetite) is a promising candidate for spintronic applications, such as magnetic tunneling junctions (MTJs) or magnetic data storage (Magnetoresistive Random Access Memory = MRAM). Previously, magnetite films were grown on lattice matched MgO substrates. Here, we study Fe₃O₄ epitaxy on SrTiO₃(001) (lattice mismatch -7.5%) by means of high resolution low energy electron diffraction with spot profile analysis (SPA-LEED) to shed light on strain effects. The magnetite films were grown by stepwise deposition and linescans were performed after each deposition step for different energies.

Due to the lattice mismatch an (111) oriented epitaxial interface layer is observed first. The thickness depends on growth conditions. Thereafter, the magnetite film reorientates and grows with (001) direction. Additionally, the profile analysis of the diffraction spots reveals information about the surface morphology, such as atomic steps, roughness or surface defects.