Proceedings of the International Conference on Magnetism
J. Phys. Colloques 49 (1988) C8-91-C8-92
DOI: 10.1051/jphyscol:1988832
MULTI-ORBITAL CPA CALCULATION OF SPIN WAVE ENERGIES IN NICKEL ALLOYS
R. Bechara Muniz1, J. d'Albuquerque e Castro1 et D. M. Edwards21 Instituto de Fisica, Universidade Federal Fluminense, Niteroi, RJ - 24020, Brazil
2 Department of Mathematics, Imperial College, London SW7 2BZ, G.B.
Abstract
Calculations of the spin wave stiffness constant in ferromagnetic Ni1-xCox and Ni1-xFex, with 0 < x < 0.5, are based on a coherent potential approach to a tight-binding d-band model with both diagonal and off diagonal disorder. The results differ significantly from those of earlier work using the virtual crystal approximation and the agreement with experiment is good for NiCo but poor for concentrated NiFe alloys.