Structural analysis of FeO(111)/Ag(001): undulation of hexagonal oxide monolayers due to square lattice metal substrates
Autor(en): | Bruns, D. Kiesel, I. Jentsch, S. Lindemann, S. Otte, C. Schemme, T. Kuschel, T. Wollschlaeger, J. |
Stichwörter: | AG(001); DIFFRACTION; ELECTRONIC-STRUCTURE; EPITAXIAL-GROWTH; FeO monolayer; FILMS; LEED; MORPHOLOGY; OXIDATION; Physics; Physics, Condensed Matter; scanning tunneling microscopy; SPINTRONICS; spot profile analysis low energy electron diffraction; STM; unudulated monolayer | Erscheinungsdatum: | 2014 | Herausgeber: | IOP PUBLISHING LTD | Journal: | JOURNAL OF PHYSICS-CONDENSED MATTER | Volumen: | 26 | Ausgabe: | 31 | Zusammenfassung: | Iron oxide monolayers are grown on Ag(0 0 1) via reactive molecular beam epitaxy (metal deposition in oxygen atmosphere). The monolayer shows FeO stoichiometry as concluded from x-ray photoemission spectra. Both low energy electron diffraction as well as scanning tunneling microscopy demonstrate that the FeO layer has a quasi-hexagonal (1 1 1) structure although deposited on a surface with square symmetry. Compared to bulk values, the FeO(1 1 1) monolayer is unidirectionally expanded by 3.4% in < 11 (2) over bar > directions while bulk values are maintained in < 1 (1) over bar0 > directions. In < 11 (2) over bar > directions, this lattice mismatch between FeO(1 1 1) monolayer and Ag(0 0 1) causes a commensurate undulation of the FeO monolayer where 18 atomic rows of the FeO(1 1 1) monolayer match 17 atomic rows of the Ag(0 0 1) substrate. In < 1 (1) over bar0 > directions, however, the FeO(1 1 1) monolayer has an incommensurate structure. |
ISSN: | 09538984 | DOI: | 10.1088/0953-8984/26/31/315001 |
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geprüft am 13.05.2024