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Spin-wave dynamics in the helimagnet FeGe studied by small-angle neutron scattering
Siegfried, S.-A.; Sukhanov, A. S.; Altynbaev, E. V. et al.
2017In Physical Review. B, 95 (13), p. 134415
Peer reviewed
 

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Abstract :
[en] We have studied the spin-wave stiffness of the Dzyaloshinskii-Moriya helimagnet FeGe in a temperature range from 225 K up to TC ≈ 278.7 K 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] meV °A2. The finite value of the spin-wave stiffness A = 58 meV °A2 at TC classifies the order-disorder phase transition in FeGe as being the first-order one.
Disciplines :
Physics
Author, co-author :
Siegfried, S.-A.
Sukhanov, A. S.
Altynbaev, E. V.
Honecker, Dirk ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Heinemann, A.
Tsvyashchenko, A. V.
Grigoriev, S. V.
External co-authors :
yes
Language :
English
Title :
Spin-wave dynamics in the helimagnet FeGe studied by small-angle neutron scattering
Publication date :
2017
Journal title :
Physical Review. B
ISSN :
2469-9950
Volume :
95
Issue :
13
Pages :
134415
Peer reviewed :
Peer reviewed
Focus Area :
Physics and Materials Science
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