First-principles study of spin-wave dispersion in Sm(Fe1−xCox)12

We present spin-wave dispersion in Sm(Fe1−xCox)12 calculated from first-principles. Anisotropy in the lowest branch of the spin-wave dispersion around the Γ point is discussed. It is shown that spin-waves propagate more easily along a∗-axis than along c∗-axis, especially in SmFe12. We also compare values of the spin-wave stiffness with those obtained from an experiment. The calculated values are in good agreement with the experimental values.