Magnon damping from DFT

Different dimensionality trends in the Landau damping of magnons in iron, cobalt, and nickel: Time-dependent density functional study.
Paweł Buczek, Arthur Ernst, and Leonid M. Sandratskii
Phys. Rev. B 84, 174418 (2011)

Spin waves of fcc Co. Solid circles correspond to ω0(q), while the error bars denote full width at  half maximum (FWHM) of the peak. Solid line denotes SW energies obtained from MFT. Solid triangles stand for the experimental estimation of the dispersion relation by Balash.