%0 journal article
%@ 1098-0121
%A Grigoriev, S.V., Sukhanov, A.S., Altynbaev, E.V., Siegfried, S.-A., Heinemann, A., Kizhe, P., Maleyev, S.V.

%D 2015
%J Physical Review  B

%P 220415 
%R doi:10.1103/PhysRevB.92.220415
%T Spin waves in full-polarized state of Dzyaloshinskii-Moriya helimagnets: Small-angle neutron scattering study
%U https://doi.org/10.1103/PhysRevB.92.220415
 
%X We develop the technique to study the spin-wave dynamics of the full-polarized state of the Dzyaloshinskii-Moriya helimagnets by polarized small-angle neutron scattering. We have experimentally proven that the spin-waves dispersion in this state has the anisotropic form. We show that the neutron scattering image displays a circle with a certain radius which is centered at the momentum transfer corresponding to the helix wave vector in helimagnetic phase k s  , which is oriented along the applied magnetic field H . The radius of this circle is directly related to the spin-wave stiffness of this system. This scattering depends on the neutron polarization showing the one-handed nature of the spin waves in Dzyaloshinskii-Moriya helimagnets in the full-polarized phase. We show that the spin-wave stiffness A  for MnSi helimagnet decreased twice as the temperature increases from zero to the critical temperature Tc.