Spin-wave dynamics in Invar Fe65Ni35 studied by small-angle polarized neutron scattering

Authors
  • E.H. Brück
  • S.V. Grigoriev
  • V.V. Deriglazov
  • A.I. Okorokov
Publication date 2002
Journal Applied Physics. A, Materials Science & Processing
Volume | Issue number 74 | suppl.1
Pages (from-to) 719-721
Organisations
  • Faculty of Science (FNWI) - Institute of Physics (IoP) - Van der Waals-Zeeman Institute (WZI)
Abstract Abstract. Spin dynamics in Fe65Ni35 Invar alloy has been studied by left-right asymmetry of small-angle polarized neutron scattering below TC=485 K in external magnetic fields of H=0.05-0.25 T inclined relative to the incident beam. The spin-wave stiffness D and the damping & were obtained by fitting the antisymmetrical contribution to the scattering. The spin-wave stiffness extrapolated by a (T/TC)5/2 law to T=0 K is D0=117-2 meVÅ2, which is somewhat smaller than the spin-wave stiffness obtained by triple-axis spectrometry.
Document type Article
Published at https://doi.org/10.1007/s003390101138
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