  Magnetism is a key driving force controlling several thermodynamic and
kinetic properties of Fe-Cr systems. We present a newly-developed TB model for
Fe-Cr, where magnetism is treated beyond the usual collinear approcimation. A
major advantage of this model consists in a rather simple fitting procedure. In
particular, no specific properties of the binary system is explicitly required
in the fitting database. The present model is proved to be accurate and highly
transfer-able for electronic, magnetic and energetic properties of a large
variety of structural and chemical environments: surfaces, interfaces, embedded
clusters, and the whole compositional range of the binary alloy. The occurence
of non-collinear magnetic configurations caused by magnetic frustrations is
successfully predicted. The present TB approach can apply for other binary
magnetic transition-metal alloys. It is expected to be particularly promissing
if the size difference between the alloying elements is rather small and the
electronic properties prevail.
