Abstract
Spin wave dispersion relations in Fe3-xMnxSi ordered alloys have been measured by neutron scattering for alloys with x = 0.04 and x = 0.18. The dispersion relations have been found to be quadratic in the magnon wavevector q̄ up to about half of the Brillouin zone along [111] direction. The measured values of the spin wave stiffness constant are 169±7 meV Å02 and 207±7 meV Å02 for samples with x = 0.18 and x = 0.04, respectively. The energy gap found from the rough data turned out to be almost totally due to the triple-axis spectrometer resolution properties. The nearest neighbour exchange integral for FeFe interaction, calculated from the above data, equals to 22.5±1.0 meV.
Original language | English |
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Pages (from-to) | 773-775 |
Number of pages | 3 |
Journal | Solid State Communications |
Volume | 38 |
Issue number | 9 |
DOIs | |
State | Published - Jun 1981 |
Externally published | Yes |