Structural and magnetic properties of Co-Fe binary alloy monolayers on W(110).
We present an experimental investigation of CoxFe1-x monolayers grown on flat and stepped W(110) surfaces. Atomically resolved scanning tunneling microscopy and low energy electron diffraction reveal continuous miscibility and pseudomorphic growth of Co and Fe for 0<or=x<0.6. We observe short range ordered CoFe3-p(2x2) and CoFe-c(2x2) structures in the pseudomorphic monolayer. High Co concentrations lead to a phase separation. The Curie temperature and the ferromagnetic Kerr signal at low temperatures decrease monotonically with increasing Co concentration, finally vanishing at x=0.5.
Pratzer
M
M
Institut für Physik, Johannes Gutenberg-Universität Mainz, Staudingerweg 7, D-55099 Mainz, Germany.
Elmers
H J
HJ