First-principles study of spin-wave dispersion in Sm(Fe${}_{1-x}$Co${}_x$)${}_{12}$

Abstract

We present spin-wave dispersion in Sm(Fe${}_{1-x}$Co${}_x$)${}_{12}$ calculated based on first-principles. Anisotropy in the lowest branch of the spin-wave dispersion around the $\Gamma$ point is discussed. Spin-waves propagate more easily along $a^{\ast }$-axis than along $c^{\ast }$-axis, especially in SmFe${}_{12}$. 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.

15 pages, 6 figures

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