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Pis'ma v Zh. Èksper. Teoret. Fiz., 2018, Volume 107, Issue 10, Pages 673–678 (Mi jetpl5580)  

CONDENSED MATTER

On the measurement of the stiffness of spin waves in the Fe$_{0.75}$Co$_{0.25}$Si helimagnet by the small-angle neutron scattering method

S. V. Grigorievabc, K. A. Pshenichnyiabc, E. V. Altynbaevabc, S.-A. Siegfriedd, A. Heinemannd, D. Honneckere, D. Menzelf

a St. Petersburg State University, St. Petersburg, Russia
b Institute for High Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow, Russia
c Petersburg Nuclear Physics Institute, National Research Center Kurchatov Institute, Gatchina, Russia
d Helmholtz Zentrum Geesthacht, Geesthacht, Germany
e Institute Laue-Langevin, Grenoble, France
f Institut für Physik der Kondensierten Materie, Braunschweig, Germany

Abstract: The stiffness of spin waves in the Fe$_{0.75}$Co$_{0.25}$Si helimagnet with the Dzyaloshinskii–Moriya interaction in a state fully magnetized by an external field has been measured by the small-angle neutron scattering method. It has been shown that the dispersion of magnons in this state is anisotropic because the neutron scattering pattern consists of two circles for neutrons with obtaining and losing the magnon energy, respectively. The centers of the circles are shifted by the momentum transfer oriented along the applied magnetic field $\mathbf{H}$ and equal to the wave vector of the spiral $\pm \mathbf{k}_s$ measured in inverse nanometers. The radius of the circles is directly related to the stiffness of spin waves and depends on the magnitude of the magnetic field. It has been shown that the stiffness of spin waves $A$ for the helimagnet is equal to $46.0$ meV Å$^2$ at $T=0$ K and decreases weakly (by $20%$) with increasing temperature up to the critical value $T_c = 38$ K.

Funding Agency Grant Number
Russian Science Foundation 17-12-01050


DOI: https://doi.org/10.7868/S0370274X18100107

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English version:
Journal of Experimental and Theoretical Physics Letters, 2018, 107:10, 640–645

Bibliographic databases:

Document Type: Article
Received: 09.04.2018

Citation: S. V. Grigoriev, K. A. Pshenichnyi, E. V. Altynbaev, S.-A. Siegfried, A. Heinemann, D. Honnecker, D. Menzel, “On the measurement of the stiffness of spin waves in the Fe$_{0.75}$Co$_{0.25}$Si helimagnet by the small-angle neutron scattering method”, Pis'ma v Zh. Èksper. Teoret. Fiz., 107:10 (2018), 673–678; JETP Letters, 107:10 (2018), 640–645

Citation in format AMSBIB
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\by S.~V.~Grigoriev, K.~A.~Pshenichnyi, E.~V.~Altynbaev, S.-A.~Siegfried, A.~Heinemann, D.~Honnecker, D.~Menzel
\paper On the measurement of the stiffness of spin waves in the Fe$_{0.75}$Co$_{0.25}$Si helimagnet by the small-angle neutron scattering method
\jour Pis'ma v Zh. \`Eksper. Teoret. Fiz.
\yr 2018
\vol 107
\issue 10
\pages 673--678
\mathnet{http://mi.mathnet.ru/jetpl5580}
\crossref{https://doi.org/10.7868/S0370274X18100107}
\transl
\jour JETP Letters
\yr 2018
\vol 107
\issue 10
\pages 640--645
\crossref{https://doi.org/10.1134/S0021364018100107}
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