Magnetic excitations in FCC Mn (37%Fe, 3%Cu) alloy

Autor: Joanna Jankowska-Kisielinska, Bernard Hennion, Kazimierz Mikke
Rok vydání: 2006
Předmět:
Zdroj: physica status solidi c. 3:151-154
ISSN: 1610-1642
1862-6351
DOI: 10.1002/pssc.200562429
Popis: Within the program of our systematic studies of magnetic excitations of manganese alloys the inelastic neutron scattering in FCC Mn(37%Fe,3%Cu) was measured for the temperature range 1.7–600 K. This alloy has the FCC crystal structure both in paramagnetic and AF phase and its composition is close to the range where the enhanced itinerant behaviour was predicted by the theory. The measured spin-wave velocity and the energy gap in the spin wave spectrum were reported earlier to reach the maximum values in this composition range. Our data did not confirm these earlier results. The expected anisotropy of the inelastic neutron scattering was not found neither in the antiferromagnetic phase nor in the paramagnetic one. The q-dependence of the spin-wave damping is quadratic rather than linear and the spin-wave damping increase with temperature, as usually predicted for damping due to magnon scattering on magnons and on other excitations. This result is in contrast with the data for the FCT Mn(10%Fe,3%Cu) where the q-dependence of the spin-wave damping is linear and the damping parameter was found to be temperature independent excepting the region close to TN. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
Databáze: OpenAIRE
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