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Abstract
The electronic structure and magnetic properties of fcc NiNb and bcc FeNb alloys within the Nb concentration of 20 at% are studied by band structure calculations based on the Korringa-Kohn-Rostoker coherent-potential approximation method. The results show that niobium has a magnetic moment in Ni and Fe with antiparallel coupling. The density of states of Nb in fcc NiNb and bcc FeNb calculated in the paramagnetic state shows a minimum at the Fermi energy which leads to the antiparallel coupling of Nb. The local magnetic moments of Nb and Ni drop abruptly in fcc NiNb alloy as the Nb concentration increases, although the local magnetic moment of the Nb hardly decreases in bcc FeNb alloy.
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