MISFIT-RELATED EFFECTS IN THE EPITAXIAL-GROWTH OF IRON ON W(110)

Time-resolved in situ STM has been used to investigate the growth of i ron on W(110). In the submonolayer range, a strong inhibition of islan d coalescence is present up to 0.6 ML due to the misfit of 9.4% The on set of coalescence can be correlated with the magnetic percolation in these thin layers. Growth at higher temperature leads to the developme nt of a sequence of dislocation networks which start from the second i ron layer on with a wider spaced one-dimensional array. With the third layer a second one-dimensional network in [001]-direction appears, sh owing relaxation to the bulk Fe lattice constant in only one direction . A further layer is necessary to introduce a two-dimensional network, leading to a fully relaxed Fe-layer. The growth of wedge-shaped 3D-is lands on a misoriented W(110)-sample in the Stnnski-Krastanov growth r egime enables us to study different local layer thicknesses simultaneo usly. It is thus possible to examine the decrease in influence of the dislocation network on the surface topography.