Spin-wave dynamics in the helimagnet FeGe studied by small-angle neutron scattering

Authors:
S.-A.. Siegfried, A. S. Sukhanov, E. V. Altynbaev, D. Honecker, A. Heinemann, A. V. Tsvyashchenko, S. V. Grigoriev
The year of the publication:
2017
Journal:
Phys. Rev. B vol. 95 134415
Abstract:

We have studied the spin-wave stiffness of the Dzyaloshinskii-Moriya helimagnet FeGe in a temperature range from 225 K up to TC≈278.7K by small-angle neutron scattering. The method we have used is based on [Grigoriev et al., Phys. Rev. B 92, 220415(R) (2015)] and was extended here for the application in polycrystalline samples. We confirm the validity of the anisotropic spin-wave dispersion for FeGe caused by the Dzyaloshinskii-Moriya interaction. We have shown that the spin-wave stiffness A for the FeGe helimagnet decreases with a temperature as A(T)=194[1−0.7(T/TC)4.2]meVÅ2. The finite value of the spin-wave stiffness A=58meVÅ2 at TC classifies the order-disorder phase transition in FeGe as being the first-order one.

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