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We present an inelastic neutron scattering study on single-crystalline LiFeAsdevoted to the characterization of the incommensurate antiferromagneticfluctuations at $\mathbf{Q}=(0.5\pm\delta, 0.5\mp\delta, q_l)$. Time-of-flightmeasurements show the presence of these magnetic fluctuations up to an energytransfer of 60 meV, while polarized neutrons in combination with longitudinalpolarization analysis on a triple-axis spectrometer prove the pure magneticorigin of this signal. The normalization of the magnetic scattering to anabsolute scale yields that magnetic fluctuations in LiFeAs are by a factoreight weaker than the resonance signal in nearly optimally Co-dopedBaFe$_2$As$_2$, although a factor two is recovered due to the split peaks owingto the incommensurability. The longitudinal polarization analysis indicatesweak spin space anisotropy with slightly stronger out-of-plane componentbetween 6 and 12 meV. Furthermore, our data suggest a fine structure of themagnetic signal most likely arising from superposing nesting vectors.

Incommensurate antiferromagnetic fluctuations in single-crystalline LiFeAs studied by inelastic neutron scattering