Magnetic structure of small Fe-Ni clusters: calculations in the Ni rich region

Small clusters present many novel properties absent in hulk materials. One of the most relevant features of small transition metal systems is their ma gnetic behavior. Monoatomic clusters show a magnetic moment per atom larger than the in the hulk. However, Fe-Ni clusters have experimentally a lower magnetization than the corresponding bulk alloy values. In this contributio n we calculate electronic and magnetic structure of Fe1-xNix clusters, for x > 0.5. We find ferro- and antiferromagnetic self-consistent solutions, in the antiferro solutions the Fe atoms are antiferromagnetically aligned amo ng themselves, while the Ni atoms have a lower local magnetization than in the hulk.