Stable and Metastable Structures of Cobalt on Cu(001): An ab initio Study

Details Stable and Metastable Structures of Cobalt on Cu(001): An ab initio Study Stable and Metastable Structures of Cobalt on Cu(001): An ab initio Study

1999-10-27

arxiv.org/abs/cond-mat/9910456v1

Phys. Rev. B 61, 2211-2220 (2000)

Physics

Condensed Matter

Materials Science

11 pages including 4 figures. Related publications can be found at http://www.fhi-berlin.mpg.de/th/paper.html

Scientific paper

10.1103/PhysRevB.61.2211

We report results of density-functional theory calculations on the structural, magnetic, and electronic properties of (1x1)-structures of Co on Cu(001) for coverages up to two monolayers. In particular we discuss the tendency towards phase separation in Co islands and the possibility of segregation of Cu on top of the Co-film. A sandwich structure consisting of a bilayer Co-film covered by 1ML of Cu is found to be the lowest-energy configuration. We also discuss a bilayer c(2x2)-alloy which may form due to kinetic reasons, or be stabilized at strained surface regions. Furthermore, we study the influence of magnetism on the various structures and, e.g., find that Co adlayers induce a weak spin-density wave in the copper substrate.

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