Abstract
Using a density functional theory for non-collinear spin arrangements, we model magnetization changes with well-defined wave vectors and calculate self-consistently the corresponding total-energy changes. From this we obtain the anisotropic spin wave dispersion relation for long and medium wavelengths, finding the spin wave stiffness constant to be in good agreement with experimental values. We also derive Heisenberg-exchange constants that give a reasonable mean-field estimate of the Curie temperature.
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