Spin-wave stiffness of the Dzyaloshinskii-Moriya helimagnet compounds Fe1−xCoxSi studied by small-angle neutron scattering
Spin-wave stiffness of the Dzyaloshinskii-Moriya helimagnet compounds
Fe1−xCoxSi
studied by small-angle neutron scattering
复制标题
通过小角中子散射研究 Dzyaloshinskii-Moriya 螺旋磁体化合物 Fe1−xCoxSi 的自旋波刚度
作者：
S. Grigoriev;K. A. Pschenichnyi;E. Altynbaev;S.;A. Heinemann;D. Honnecker;D. Menzel
用小角中子散射法测量了Dzyaloshinskii-Moriya helimagnet化合物Fe 1−x Co x Si （x = 0）的自旋波刚度。25,0。30,0。50. 结果表明，由于Dzyaloshinskii-Moriya相互作用，在全极化状态下的自旋波色散具有各向异性。它在中子散射图中反映为两个圆，分别表示中子获得和失去磁振子能量。圆的中心被沿外加磁场H方向的动量转移所移动，动量转移等于螺旋的波矢量±k s。圆的半径与自旋波的刚度直接相关，并取决于磁场。我们发现每种化合物的自旋波刚度A随温度的变化都很弱。另一方面，与临界温度tc和低温有序矩对x的依赖相反，自旋波刚度A随x线性增加。实验得到的刚度A值证实了baker - jensen模型对所研究化合物的定量适用性。
The spin wave stiffness was measured by small-angle neutron scattering method in the Dzyaloshinskii-Moriya helimagnet compounds Fe 1 − x Co x Si with x = 0 . 25 , 0 . 30 , 0 . 50. It has been shown that the spin wave dispersion in the fully polarized state is anisotropic due to Dzyaloshinskii-Moriya interaction. It is reflected in the neutron scattering pattern as two circles for neutrons obtaining and losing the magnon energy, respectively. The centers of the circles are shifted by the momentum transfer oriented along the applied magnetic field H and equal to the wave vector of the spiral ± k s . The radius of the circles is directly related to the stiffness of spin waves and depends on the magnetic field. We have found that the spin-wave stiffness A change weakly with temperature for each individual compound. On the other hand, the spin-wave stiffness A increases linearly with x in contrast to the x dependences of the critical temperature T c and the low-temperature ordered moment. Experimentally obtained values of the stiffness A approve quantitative applicability of the Bak-Jensen model for the compounds under study.
影响因子：
8.6
作者：
Gayles, J.;Freimuth, F.;Mokrousov, Y.
通讯作者：
Mokrousov, Y.