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We study the Fe/W(110) monolayer system through a combination of firstprinciples calculations and atomistic spin dynamics simulations. We focus onthe dispersion of the spin waves parallel to the [001] direction. Our resultscompare favorably with the experimental data of Prokop et al. [Phys. Rev. Lett.102, 177206], and correctly capture a drastic softening of the magnon spectrum,with respect to bulk bcc Fe. The suggested shortcoming of the itinerantelectron model, in particular that given by density functional theory, isrefuted. We also demonstrate that finite temperature effects are significant,and that atomistic spin dynamics simulations represent a powerful tool withwhich to include these.

Magnon softening in a ferromagnetic monolayer: a first-principles spin dynamics study