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Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 119: Oxides III: Single-Atom Catalysis, Iron Oxides

O 119.8: Vortrag

Freitag, 20. März 2020, 12:30–12:45, REC C 213

Near-surface diffusion of Fe3O4 (001) observed by nuclear forward scattering — •Steffen Tober1,2, Jan-Christian Schober1,2, Esko Erik Beck1,2, Guilherme Dalla Lana Semione1,2, Simon Chung1,2, Kai Schlage1, Olaf Leupold1, Ilya Sergeev1, René Steinbrügge1, Hans-Christian Wille1, Heshmat Noei1, Vedran Vonk1, and Andreas Stierle1,21Deutsches Elektronen-Synchrotron, Hamburg — 2Universität Hamburg, Fachbereich Physik

The near surface defect structure is of key importance to tune the performance of magnetite (Fe3O4) in catalysts and spintronic devices. Recent observations of the formation and lifting of the subsurface cation vacancy reconstruction on the (001) surface indicate the presence of a near surface transport process influencing surface phenomena [1,2]. The near surface cation transport between a homoepitaxially grown 57Fe3O4 layer and a (001) oriented Fe3O4 single crystalline substrate was studied by nuclear forward scattering at the P01 Beamline of PETRAIII. A smearing of the isotope distribution at the film/substrate interface was observed by nuclear resonant reflectivity [3] as a function of temperature in vacuum or oxygen, indicating interfacial cation transport. The sample’s chemical state was monitored by time spectra. These results allow to quantify the mobility of near surface cations in magnetite.

[1] Arndt, B. et al. Chem. Comm. 1, 92 (2019)

[2] Arndt, B. et al. Surf. Sci. 653, 76 (2016)

[3] Andreeva et al., Mosc. Univ. Phys. Bull. 63, 132 (2008)

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