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arXiv 2104.06240cond-mat.mtrl-sci
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具有Dzyaloshinskiii-Moriya相互作用的大块手征磁体中的束缚偶极子和交换自旋波

Confined dipole and exchange spin waves in a bulk chiral magnet with Dzyaloshinskii-Moriya interaction

Ping Che, Ioannis Stasinopoulos, Andrea Mucchietto, Jianing Li, Helmuth Berger, Andreas Bauer, Christian Pfleiderer, Dirk Grundler

摘要:

Dzyaloshinskiii-Moriya相互作用通过引入色散关系的不对称性对手性磁体Cu $_2$ OSeO $_3$中激发的自旋波产生影响。因此,手征磁体的受限本征模不再是传统的自旋驻波。在这里,我们报告了一个综合的实验和微磁模拟研究的宽带微波光谱,我们观察到限制自旋波高达第十一阶散装铜$_2$ OSeO $_3$在场极化状态。在微磁模拟中,我们发现了类似的丰富光谱。它们表明,同时激发的偶极和交换占主导地位的自旋波的波长下降到(47.2 $\pm$ 0.05)nm归因于交换相互作用调制。我们的研究结果表明,在没有具有挑战性的纳米纤维的情况下,在散装样品中有效地创建交换自旋波,从而探索它们与非共线自旋纹理的散射。

英文摘要:

The Dzyaloshinskii-Moriya interaction (DMI) has an impact on excited spin waves in the chiral magnet Cu$_2$OSeO$_3$ by means of introducing asymmetry on 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 we observe confined spin waves up to eleventh order in bulk Cu$_2$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 DMI to be effective to create exchange spin waves in a bulk sample without the challenging nanofabrication and thereby to explore their scattering with noncollinear spin textures.

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