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

Show full item record

Page view(s)

3
Last Week
0
Last month
0
checked on Feb 28, 2024

Google ScholarTM

Check

Altmetric