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.

了解手性磁阶的自旋波激发，例如天蝎子晶体（SkX），对于确认这种奇异的磁阶具有重要的意义。通过竞争Dzyaloshinskii-Moriya和具有磁场或各向异性的铁磁交换相互作用来实现SkX。在这里，我们使用蒙特卡洛（Monte Carlo）和自旋动力学模拟计算动态自旋结构因子，提取顺磁体到SkX跃迁附近的SkX中的自旋波谱。在SkX内，我们发现了六个自旋波模式，这些模式又被源自铁磁背景的另一种模式所补充。高于临界温度T _s对于天蝎子的结晶，我们发现了一种扩散机制，让人联想到液晶的转变，这表明天蝎子特征的拓扑自旋结构开始在T _s之上发展为SkX的前体。我们讨论了锰-铱酸盐异质结构中使用非弹性中子散射实验检测SkX自旋波的机会。