Papers › Field dependence of non-reciprocal magnons in chiral MnSi
Field dependence of non-reciprocal magnons in chiral MnSi
Tobias Weber, Johannes Waizner, Gregory Tucker, Robert Georgii, Max Kugler, Andreas Bauer, Christian Pfleiderer, Markus Garst, Peter Böni
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Spin waves in chiral magnetic materials are strongly influenced by the Dzyaloshinskii-Moriya interaction resulting in intriguing phenomena like non-reciprocal magnon propagation and magnetochiral dichroism. Here, we study the non-reciprocal magnon spectrum of the archetypical chiral magnet MnSi and its evolution as a function of magnetic field covering the field-polarized and conical helix phase. Using inelastic neutron scattering, the magnon energies and their spectral weights are determined quantitatively after deconvolution with the instrumental resolution. In the field-polarized phase the imaginary part of the dynamical susceptibility χ″(ε, q) is shown to be asymmetric with respect to wavevectors q longitudinal to the applied magnetic field H, which is a hallmark of chiral magnetism. In the helimagnetic phase, χ″(ε, q) becomes increasingly symmetric with decreasing H due to the formation of helimagnon bands and the activation of additional spinflip and non-spinflip scattering channels. The neutron spectra are in excellent quantitative agreement with the low-energy theory of cubic chiral magnets with a single fitting parameter being the damping rate of spin waves.
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