6533b7d7fe1ef96bd1268353

RESEARCH PRODUCT

Structure and electronic properties of ultrathin Co films on W(110)

M. PratzerHans-joachim Elmers

subject

Low-energy electron diffractionChemistryStackingSurfaces and InterfacesCondensed Matter PhysicsSurfaces Coatings and Filmslaw.inventionCrystallographyTransition metallawMonolayerMaterials ChemistryScanning tunneling microscopeSpectroscopySuperstructure (condensed matter)Molecular beam epitaxy

description

Abstract The structure and electronic properties of ultrathin Co films on W(1 1 0) grown by molecular beam epitaxy in UHV were investigated by low energy electron diffraction (LEED) and scanning tunneling microscopy and spectroscopy (STM and STS). For coverages above 0.7 ML the pseudomorphic (ps) monolayer is transformed gradually into close-packed (cp-) monolayer areas, showing up as separated islands that increase in size with coverage until the cp-monolayer is complete. Two different structures of the cp-monolayer were observed by atomically resolved STM, both leading to a 8 × 1 superstructure in the LEED pattern. Higher coverages continue to grow in the Stransky–Krastanov growth mode forming simultaneously double layer islands and triple layer islands in fcc(1 1 1) and hcp(0 0 0 1) stacking. STS reveals tunneling spectra that differ considerably depending on the thickness and on the structure. Two different classes of triple layer islands can be distinguished by a resonant peak at +0.3 eV appearing in only one of the two classes. We attributed this behavior to a different stacking according to a fcc or hcp structure.

yearjournalcountryeditionlanguage
2004-02-01Surface Science
https://doi.org/10.1016/j.susc.2003.12.032