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We report inelastic neutron scattering measurements of the magneticexcitations in SrFe2As2, the parent of a family of iron-based superconductors.The data extend throughout the Brillouin zone and up to energies of ~260meV. Ananalysis with the local-moment J_1-J2 model implies very different in-planenearest-neighbor exchange parameters along the $a$ and $b$ directions, both inthe orthorhombic and tetragonal phases. However, the spectrum calculated fromthe J1-J2 model deviates significantly from our data. We show that thequalitative features that cannot be described by the J1-J2 model are readilyexplained by calculations from a 5-band itinerant mean-field model.

Itinerant Spin Excitations in SrFe2As2 Measured by Inelastic Neutron Scattering