We have investigated the magnetic excitations of the spin-density wave in pure chromium using inelastic neutron scattering. We have observed spin-wave modes originating from the incommensurate magnetic Bragg satellite reflections. A new additional excitation is observed with a commensurate wave vector and is interpreted as a feature specific to the transverse spin-density wave. We also present scattering data near and above the N\'eel point TN. While we do not observe a divergence of the susceptibility at the incommensurate satellite positions for T approaching TN, there is a large increase in the diffuse scattering throughout a broad region of the reciprocal lattice near (0,0,1). We suggest connections between these data and the theory of itinerant magnetism developed by Moriya and Kawabata.
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Fincher et al. (1981) studied this question.
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