Spin-wave dynamics in Invar Fe65Ni35 studied by small-angle polarized neutron scattering
- Brück, E.H.
- Grigoriev, S.V.
- Deriglazov, V.V.
- Okorokov, A.I.
- Dijk van, N.H.
- Klaasse, J.C.P.
Publication date
January 2002
DOI Publisher
Springer Science and Business Media LLCAbstract
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
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