SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 17: Thin Films: Magnetic Anisotropy
MA 17.6: Vortrag
Dienstag, 28. März 2023, 10:45–11:00, POT 6
Europium oxide: Growth guide for the first monolayers on oxidic substrates — Paul Rosenberger1,2 and •Martina Müller2 — 1Fakultät Physik, Technische Universität Dortmund, 44221 Dortmund, Germany — 2Fachbereich Physik, Universität Konstanz, 78457 Konstanz, Germany
Interfacial oxygen exchange at oxide interfaces bears huge potential in stabilizing metastable or novel phases of functional oxides down to the monolayer limit. Consequently, controlling the underlying interfacial processes opens up the possibility to tailor and tune functionalities of oxide interfaces. By taking advantage of active oxygen supply of the substrate material, waiving any external oxygen dosage, high-quality, crystalline ultrathin films of the Heisenberg ferromagnet europium monoxide (EuO) were stabilized on YSZ (001)[1]. This so-called redox-assisted growth mode was monitored end to end by in situ x-ray photoelectron spectroscopy. The evolution of Eu 3d core levels allows us to disentangle the processes of interfacial oxygen diffusion and vacancy formation in stabilizing the very first monolayers of EuO on YSZ (001). An expedient background correction analysis is presented, which allows us to quantify the critical Eu3+/Eu2+ ratio in the ultrathin film regime. We concluded on the key mechanisms of redox-assisted EuO/YSZ (001) thin film synthesis, merging in a universal three-process growth model that may serve as guideline for redox-assisted synthesis of metastable low-dimensional oxides.
[1] P. Rosenberger and M. Müller, Phys. Rev. Mater. 6, 044404 (2022).