Zhuo Fengjun, Li Hang, Cheng Zhenxiang, Manchon Aurélien
School of Physics and Electronics, Henan University, Kaifeng 475004, China.
Physical Science and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia.
Nanomaterials (Basel). 2022 Mar 31;12(7):1159. doi: 10.3390/nano12071159.
A magnonic metamaterial in the presence of spatially modulated Dzyaloshinskii-Moriya interaction is theoretically proposed and demonstrated by micromagnetic simulations. By analogy to the fields of photonics, we first establish magnonic Snell's law for spin waves passing through an interface between two media with different dispersion relations due to different Dzyaloshinskii-Moriya interactions. Based on magnonic Snell's law, we find that spin waves can experience total internal reflection. The critical angle of total internal reflection is strongly dependent on the sign and strength of Dzyaloshinskii-Moriya interaction. Furthermore, spin-wave beam fiber and spin-wave lens are designed by utilizing the artificial magnonic metamaterials with inhomogeneous Dzyaloshinskii-Moriya interactions. Our findings open up a rich field of spin waves manipulation for prospective applications in magnonics.
理论上提出了一种存在空间调制的Dzyaloshinskii-Moriya相互作用的磁子超材料，并通过微磁模拟进行了验证。类比光子学领域，我们首先为由于不同的Dzyaloshinskii-Moriya相互作用而通过具有不同色散关系的两种介质之间界面的自旋波建立了磁子斯涅尔定律。基于磁子斯涅尔定律，我们发现自旋波可以经历全内反射。全内反射的临界角强烈依赖于Dzyaloshinskii-Moriya相互作用的符号和强度。此外，利用具有不均匀Dzyaloshinskii-Moriya相互作用的人工磁子超材料设计了自旋波束光纤和自旋波透镜。我们的发现为磁子学中的潜在应用开辟了一个丰富的自旋波操纵领域。
