High-energy magnetic excitations in Mn[sub 90]Cu[sub 10]
- Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393 (United States)
- Department of Physics, Keele University, Staffs. ST5 5BG (United Kingdom) ISIS Science Division, Rutherford Appleton Laboratory, Didcot, Oxon. OX11 0QX (United Kingdom)
- ISIS Science Division, Rutherford Appleton Laboratory, Didcot, Oxon. OX11 0QX (United Kingdom)
- Faculty of Science, University of Osaka, Osaka (Japan)
The study of the magnetic excitations in Mn-rich alloys should be a good test of the multiband calculations of the spin dynamics of pure [gamma]-Mn, which is a prototypical itinerant-electron antiferromagnet. In this paper we report the results of recent neutron inelastic scattering measurements performed on Mn[sub 90]Cu[sub 10] at room temperature ([ital T]=0.63[ital T][sub [ital N]]) and up to 300 meV of energy transfer. These measurements were performed using the high-energy transfer (HET) chopper spectrometer at the ISIS spallation neutron source, Rutherford Appleton Laboratory, U.K. The results are in agreement with calculations using a model scattering function convoluted with the full HET resolution function. In this model there is a steep linear spin-wave dispersion ([ital D][approx]250 meV A) for wave vectors up to [approx]1/2 of the Brillouin zone and a strong damping which is linear in the wave vector [ital q]. For larger wave vectors the spin-wave energies are constant at about 190 meV. These features are qualitatively similar to the predictions of Cade and Young for pure [gamma]-Mn.
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6649246
- Journal Information:
- Journal of Applied Physics; (United States), Vol. 73:10; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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