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We investigate the role of Hund's coupling in the spin-wave excitations ofthe ($\pi, 0$) ordered magnetic state within a five-orbital tight-binding modelfor iron pnictides. To differentiate between the roles of intraorbital Coulombinteraction and Hund's coupling, we focus on the self-consistently obtainedmean-field SDW state with a fixed magnetic moment obtained by using differentsets of interaction parameters. We find that the Hund's coupling is crucial forthe description of various experimentally observed characteristics of thespin-wave excitations including the anisotropy, energy-dependent behavior, andspin-wave spectral weight distribution.

Spin-wave excitations in the SDW state of iron pnictides: a comparison between the roles of interaction parameters