SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 92: Oxide and Insulator Surfaces II: Structure, Epitaxy and Growth

O 92.3: Vortrag

Freitag, 31. März 2023, 11:00–11:15, CHE 91

Magnetite homoepitaxy observed by X-ray intensity growth oscillations — •Steffen Tober1,2,3, Marcus Creutzburg1, Björn Arndt1, Simon Chung1, Leon Jacobse1, Arno Jeromin1, Vedran Vonk1, and Andreas Stierle1,21Deutsches Elektronen-Synchrotron DESY, Centre for X-ray and Nanoscience, Hamburg — 2Universität Hamburg, Fachbereich Physik — 3Jülich Centre for Neutron Science (JCNS) and Peter Grünberg Institut (PGI), JARA-FIT, Forschungszentrum Jülich

Processes on the magnetite (Fe3−δO4) (001) surface like oxidative regrowth, (partial) lifting of the subsurface cation vacancy reconstruction and the element-specific incorporation of adatoms demonstrate the sensitive relation of oxygen pressure, cation transport and structure in the near-surface region of Fe3−δO4 influencing the performance of catalysts and devices [1,2,3]. We exemplarily studied the homoepitaxial growth of Fe3−δO4 (001) surface in dependence of the O2 pressure and iron flux. X-ray intensity growth oscillations proved ordered growth of Fe3−δO4 for all probed conditions while atomic force microscopy revealed newly formed micrometre-sized surface structures exceeding the amount of deposited material [4]. Our results indicate the presence of multiple parallel processes during reactive Fe3−δO4 homoepitaxy suggesting similar processes to occur also in other applications of Fe3−δO4. [1] Nie et al., J. Am. Chem. Soc. 135, 10091 (2013), [2] Arndt, B. et al. PCCP 22, 8336 (2020), [3] Mirabella et al., Electrochimica Acta, 389, 138638 (2021), [4] van der Vegt et al., Phys. Rev. Lett. 68, 3335 (1992)

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