Real-time monitoring of the structure of ultrathin Fe3O4 films during growth on Nb-doped SrTiO3(001)
Autor(en): | Kuschel, O. Spiess, W. Schemme, T. Rubio-Zuazo, J. Kuepper, K. Wollschlaeger, J. |
Stichwörter: | BEAMLINE; MAGNETITE; MORPHOLOGY; OXIDE; Physics; Physics, Applied; SURFACE-STRUCTURE | Erscheinungsdatum: | 2017 | Herausgeber: | AMER INST PHYSICS | Journal: | APPLIED PHYSICS LETTERS | Volumen: | 111 | Ausgabe: | 4 | Zusammenfassung: | In this work, thin magnetite films were deposited on SrTiO3 via reactive molecular beam epitaxy at different substrate temperatures. The growth process was monitored in-situ during deposition by means of x-ray diffraction. While the magnetite film grown at 400 degrees C shows a fully relaxed vertical lattice constant already in the early growth stages, the film deposited at 270 degrees C exhibits a strong vertical compressive strain and relaxes towards the bulk value with increasing film thickness. Furthermore, a lateral tensile strain was observed under these growth conditions although the inverse behavior is expected due to the lattice mismatch of -7.5%. Additionally, the occupancy of the A and B sublattices of magnetite with tetrahedral and octahedral sites was investigated showing a lower occupancy of the A sites compared to an ideal inverse spinel structure. The occupation of A sites decreases for a higher growth temperature. Thus, we assume a relocation of the iron ions from tetrahedral sites to octahedral vacancies forming a deficient rock salt lattice. Published by AIP Publishing. |
ISSN: | 00036951 | DOI: | 10.1063/1.4995408 |
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