Correlations between structural and magnetic properties for ultra-thin
iron films are discussed. Some selected methods of structural and mag
netic analysis are reviewed. The onset of magnetism for submonolayer F
e(110) film on W(110) is explained based on STM (scanning tunneling mi
croscopy) imaging. Hyperfine magnetic fields in iron films sandwiched
between Cr show unusual temperature behavior due to the influence of m
agnetic ordering in Cr. Magnetic properties of metastable iron phases
on Cu and Ru are discussed, based on CEMS measurements.