Field dependence of nonreciprocal magnons in chiral MnSi
Field dependence of nonreciprocal magnons in chiral MnSi
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手性 MnSi 中不可逆磁振子的场依赖性
DOI：
10.1103/physrevb.97.224403
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发表时间：
2017
影响因子：
3.7
通讯作者：
P. Boni
中科院分区：
文献类型：
--
作者：
T. Weber;J. Waizner;G. Tucker;R. Georgii;M. Kugler;A. Bauer;C. Pfleiderer;M. Garst;P. Boni
Spin waves in chiral magnetic materials are strongly influenced by the Dzyaloshinskii-Moriya interaction, resulting in intriguing phenomena like nonreciprocal magnon propagation and magnetochiral dichroism. Here, we study the nonreciprocal 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 ${\ensuremath{\chi}}^{\ensuremath{'}\ensuremath{'}}(\ensuremath{\varepsilon},\mathbf{q})$ is shown to be asymmetric with respect to wave vectors $\mathbf{q}$ longitudinal to the applied magnetic field $\mathbf{H}$, which is a hallmark of chiral magnetism. In the helimagnetic phase, ${\ensuremath{\chi}}^{\ensuremath{'}\ensuremath{'}}(\ensuremath{\varepsilon},\mathbf{q})$ becomes increasingly symmetric with decreasing $\mathbf{H}$ due to the formation of helimagnon bands and the activation of additional spin-flip and non-spin-flip 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.
Spin waves in chiral magnetic materials are strongly influenced by the Dzyaloshinskii-Moriya interaction, resulting in intriguing phenomena like nonreciprocal magnon propagation and magnetochiral dichroism. Here, we study the nonreciprocal 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 ${\ensuremath{\chi}}^{\ensuremath{'}\ensuremath{'}}(\ensuremath{\varepsilon},\mathbf{q})$ is shown to be asymmetric with respect to wave vectors $\mathbf{q}$ longitudinal to the applied magnetic field $\mathbf{H}$, which is a hallmark of chiral magnetism. In the helimagnetic phase, ${\ensuremath{\chi}}^{\ensuremath{'}\ensuremath{'}}(\ensuremath{\varepsilon},\mathbf{q})$ becomes increasingly symmetric with decreasing $\mathbf{H}$ due to the formation of helimagnon bands and the activation of additional spin-flip and non-spin-flip 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.
螺旋磁绝缘体 Cu2OSeO3 的磁振子谱
影响因子：
16.6
作者：
P.Y. Portnichenko;J. Romhanyi;Y.A. Onykiienko;A. Henschel;M. Schmidt;A.S. Cameron;M.A. Surmach;J.A. Lim;J.T. Park;A. Schneidewind;D.L. Abernathy;H. Rosner;Jeroen van den Brink;D.S. Inosov
通讯作者：
D.S. Inosov
影响因子：
41.2
作者：
Schwarze, T.;Waizner, J.;Grundler, D.
通讯作者：
Grundler, D.