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The inelastic neutron scattering due to the magnetic excitation in a single crystal of itinerant electron antiferromagnet Mn 2.8 Fe 0.2 Si has been measured. We found that the scattering profiles were well described by two components of magnetic scattering; one of them is a normal spin-wave excitation mode with antiferromagnetic correlation that has linear dispersion relation. The other is the Gaussian-shaped mode located around the magnetic Bragg points.