The inelastic neutron scattering due to the magnetic excitation in a s
ingle crystal of itinerant electron antiferromagnet Mn2.8Fe0.2Si has b
een measured. We found that the scattering profiles were well describe
d by two components of magnetic scattering; one of them is a normal sp
in-wave excitation mode with antiferromagnetic correlation that has li
near dispersion relation. The other is the Gaussian-shaped mode locate
d around the magnetic Bragg points. (C) 1998 Elsevier Science B.V. All
rights reserved.