Spin waves in full-polarized state of Dzyaloshinskii-Moriya helimagnets: Small-angle neutron scattering study

S. V. Grigoriev, A. S. Sukhanov, E. V. Altynbaev, S. -A. Siegfried, A. Heinemann, P. Kizhe, S. V. Maleyev

Research output

22 Citations (Scopus)

Abstract

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 T-c.
Original languageEnglish
Article number220415
Number of pages5
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume92
Issue number22
DOIs
Publication statusPublished - 2015

Scopus subject areas

  • Physics and Astronomy(all)

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