论文标题
液晶过渡的签名
Signatures of a liquid-crystal transition in spin-wave excitations of skyrmions
论文作者
论文摘要
理解手性磁性的自旋波激发（例如Skyrmion Crystal（SKX））具有基本的兴趣，可以确认这种外来的磁性阶。 SKX是通过竞争dzyaloshinskii-moriya和铁磁 - 交换与磁场或各向异性的相互作用来实现的。在这里，我们使用蒙特卡洛和自旋动力学模拟计算动态自旋结构因子，并在paramagnet附近提取SKX中的自旋波谱至SKX转换。在SKX内部，我们发现了六种自旋波模式，这些模式由源自铁磁背景的另一种模式补充。高于临界温度$ t_s $，用于天际敏化的结晶，我们发现了一个扩散的状态，让人联想到液体到晶体的过渡，这表明Skyrmionic特征的拓扑旋转质地开始在$ t_s $以上作为SKX的前体发展出来。我们讨论了使用锰矿式异质结构中使用无弹性中的散射实验来检测SKX的自旋波的机会。
Understanding the spin-wave excitations of chiral magnetic order, such as the skyrmion crystal (SkX), is of fundamental interest to confirm such exotic magnetic order. The SkX is realized by competing Dzyaloshinskii-Moriya and ferromagnetic-exchange interactions with a magnetic field or anisotropy. Here we compute the dynamical spin structure factor, using Monte Carlo and spin dynamics simulations, extracting the spin-wave spectrum in the SkX, in the vicinity of the paramagnet to SkX transition. Inside the SkX, we find six spin-wave modes, which are supplemented by another mode originating from the ferromagnetic background. Above the critical temperature $T_s$ for the skyrmion crystallization, we find a diffusive regime, reminiscent of the liquid-to-crystal transition, revealing that topological spin texture of skyrmionic character starts to develop above $T_s$ as the precursor of the SkX. We discuss the opportunities for the detection of the spin waves of the SkX using inelastic-neutron-scattering experiments in manganite-iridate heterostructures.
