Correlation between domain wall properties and material parameters in amorphous SmCo-films

Amorphous Sm
1-x
co
x
-films with uniaxial in-plane anisotropy with various Co-concentrations
x (.67 \leq x \leq .91)
and various film thicknesses d (
10nm \leq d \leq 350nm
) have been prepared by flash-evaporation of SmCo-alloy powders. The saturation magnetization decreases linearly with x in the whole concentration range, whereas the coercive field increases linearly with x down to
x\approx74
and then decreases. Drastic changes in all magnetic properties occur when at a given chemical composition the film thickness is reduced below
d\approx50
nm. Head-on domains are separated by zig-zag walls whose amplitudes are analyzed as a function of the material parameters.