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We report on a spin-polarized inelastic neutron scattering study of spinwaves in the antiferromagnetically ordered state of BaFe2As2. Three distinctexcitation components are identified, with spins fluctuating along the c-axis,perpendicular to the ordering direction in the ab-plane, and parallel to theordering direction. While the first two "transverse" components can bedescribed by a linear spin-wave theory with magnetic anisotropy and inter-layercoupling, the third "longitudinal" component is generically incompatible withthe local moment picture. It points towards a contribution of itinerantelectrons to the magnetism already in the parent compound of this family ofFe-based superconductors.

Longitudinal spin excitations and magnetic anisotropy in antiferromagnetically ordered BaFe2As2