Abstract
The results of studying the spin dynamics of a classical Fe65Ni35 invar alloy are presented and analyzed. The investigations are performed via small-angle polarized-neutron scattering in the oblique geometry of a magnetic field at various temperatures (T < T C). This approach is based on the analysis of left-right asymmetry in the magnetic scattering of polarized neutrons. The asymmetry effect arises when the magnetization direction of a sample is inclined with respect to the wave vector of the incident beam. The spin-wave scattering is concentrated within a range bounded by the cutoff angle θc determined by the magnetic field: θ 2c (H) = θ 20 −(gμB H)θ0/E, where \(\theta _0 = \hbar ^2 \frac{1} {{2Dm_n }}\), H is the external magnetic field, E is the initial neutron energy, D is the spin-wave stiffness constant, and m n is the neutron mass. The scattering is blurred by spinwave damping in the vicinity of the cutoff angle. The spin-wave stiffness constant can be obtained from a comparison of the asymmetric contribution to scattering and a model function. The temperature dependence D = D(T) is well defined by the expression D = D 0 |τ|x, where \(\tau = 1 - \frac{T} {{T_C }}\), x = 0.47 ± 0.01, D 0 = 137 ± 3 meVÅ2, and τ > 0.1 in the entire temperature range. The given method enables us to construct the temperature dependence of the spin-wave stiffness constant with a high accuracy and a small step.
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Original Russian Text © S.V. Grigoriev, E.V. Altynbayev, H. Eckerlebe, A.I. Okorokov, 2014, published in Poverkhnost’. Rentgenovskie, Sinkhrotronnye i Neitronnye Issledovaniya, 2014, No. 10, pp. 71–78.
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Grigoriev, S.V., Altynbayev, E.V., Eckerlebe, H. et al. Study of spin-wave dynamics in Fe65Ni35 ferromagnetic via small-angle polarized-neutron scattering. J. Surf. Investig. 8, 1027–1034 (2014). https://doi.org/10.1134/S1027451014050292
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DOI: https://doi.org/10.1134/S1027451014050292