Theory of magnon-skyrmion scattering in chiral magnets
Theory of magnon-skyrmion scattering in chiral magnets
复制标题
DOI：
10.1103/physrevb.89.064412
复制
发表时间：
2014-02-14
影响因子：
3.7
通讯作者：
Nagaosa, Naoto
中科院分区：
文献类型：
--
作者：
Iwasaki, Junichi;Beekman, Aron J.;Nagaosa, Naoto
我们从理论上研究了具有Dzyaloshinskii-Moriya相互作用的手性磁体中单个斯基子存在时的磁振子动力学。我们通过微磁模拟表明，尽管磁振子和磁振子都起源于共同的自旋，但磁振子的散射过程可以被清楚地定义。我们发现(i)由于拓扑结构的有效磁场，磁振子被skyrmion偏转，其角度强烈依赖于磁振子波数；（ii） skyrmion运动是由磁振子散射驱动的，通过磁振子和skyrmion之间的动量交换：总动量守恒。这表明，虽然高度非牛顿的动量，但天空粒子有一个定义明确的动量。
We study theoretically the dynamics of magnons in the presence of a single skyrmion in chiral magnets featuring Dzyaloshinskii-Moriya interaction. We show by micromagnetic simulations that the scattering process of magnons by a skyrmion can be clearly defined although both originate in the common spins. We find that (i) the magnons are deflected by a skyrmion, with the angle strongly dependent on the magnon wave number due to the effective magnetic field of the topological texture, and (ii) the skyrmion motion is driven by magnon scattering through exchange of the momenta between the magnons and a skyrmion: the total momentum is conserved. This demonstrates that the skyrmion has a well-defined, though highly non-Newtonian, momentum.