Journal
PHYSICAL REVIEW B
Volume 93, Issue 19, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.93.195423
Keywords
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Funding
- Polish Ministry of Science and Higher Education [N N202 259539]
- Spanish Ministry of Innovation and Science [MAT2010-18432, MAT2012-38045-C04-01]
- Office of Basic Energy Sciences, Division of Materials and Engineering Sciences, U.S. Department of Energy [DE-AC04-94AL85000]
- University of Warsaw [G53-11]
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The growth of one and two atomic layers of iron on a W(110) substrate was followed by low-energy electron microscopy. The near-surface structural properties of the perfectly flat pseudomorphic films were studied by quantitative low-energy electron diffraction analysis from areas of uniform thickness as well as by the density functional theory. A strong relaxation of the outermost atomic layers was found in Fe mono-and bilayers on W(110). By calculating the phonon dispersion relations and phonon density of states, the stability of the pseudomorphic iron bilayer on a tungsten substrate has been addressed. To complete the physical picture, an iron trilayer has also been analyzed in order to identify the source of instability for its pseudomorphic phase. Our results show that the surface instability originates from the softening of the in-plane surface modes along the [1 (1) over bar 0] direction, although the soft modes were not observed. The enhanced magnetic moments calculated within the density functional theory are in good agreement with experimental findings reported for these systems.
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