The Dzyaloshinskii-Moriya interaction (DMI) has an impact on excited spin waves in the chiral magnet ${\mathrm{Cu}}_2{\mathrm{OSeO}}_3$ by means of introducing asymmetry in their dispersion relations. The confined eigenmodes of a chiral magnet are hence no longer the conventional standing spin waves. Here we report a combined experimental and micromagnetic modeling study by broadband microwave spectroscopy, and we observe confined spin waves up to eleventh order in bulk ${\mathrm{Cu}}_2{\mathrm{OSeO}}_3$ in the field-polarized state. In micromagnetic simulations we find similarly rich spectra. They indicate the simultaneous excitation of both dipole- and exchange-dominated spin waves with wavelengths down to ($47.2\pm 0.05$) nm attributed to the exchange interaction modulation. Our results suggest the DMI to be effective in creating exchange spin waves in a bulk sample without the challenging nanofabrication and thereby in exploring their scattering with noncollinear spin textures.

中文翻译：

---

具有 Dzyaloshinskii-Moriya 相互作用的块体手性磁铁中的受限偶极子和交换自旋波

Dzyaloshinskii-Moriya 相互作用 (DMI) 对手性磁体中激发的自旋波有影响 ${铜}_2{\mathrm{操作系统}}_3$通过在它们的色散关系中引入不对称性。因此，手征磁体的受限本征模式不再是传统的自旋驻波。在这里，我们报告了通过宽带微波光谱进行的结合实验和微磁建模研究，并且我们观察到高达 11 阶的受限自旋波${铜}_2{\mathrm{操作系统}}_3$在场极化状态。在微磁模拟中，我们发现了同样丰富的光谱。它们表明偶极子和交换主导的自旋波同时激发，波长低至（$47.2\pm 0.05$) nm 归因于交换相互作用调制。我们的结果表明，DMI 可以有效地在大块样品中产生交换自旋波，而无需进行具有挑战性的纳米加工，从而探索它们与非共线自旋纹理的散射。