Manipulation of magnons opens an attractive direction in the future energy-efficient information processing devices. Such quasi-particles can transfer and process information free from the troublesome Ohmic loss in conventional electronic devices. Here, we propose to realize topologically protected magnon modes using the interface between the patterned ferrimagnetic insulator thin films of different configurations without the Dzyaloshinskii-Moriya interaction. The interface thus behaves like a perfect waveguide to conduct the magnon modes lying in the band gap. These modes are immune to backscattering even in sharply bent tracks, robust against the disorders, and maintain a high degree of coherence during propagation. We design a magnonic Mach–Zehnder interferometer, which realizes a continuous change of magnon signal with varying external magnetic field or driving frequency. Our results pave a new way for realizing topologically protected magnon waveguide and finally achieving a scalable low-dissipation spintronic devices and even the magnonic integrated circuit.

中文翻译：

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图案化铁磁绝缘体薄膜的拓扑磁振子模式

操纵马农信号为未来的节能信息处理设备打开了一个有吸引力的方向。这样的准粒子可以传输和处理信息，而不会在常规电子设备中造成麻烦的欧姆损耗。在这里，我们建议使用具有不同构造的图案化铁磁绝缘体薄膜之间的界面来实现拓扑受保护的马农模式，而无需Dzyaloshinskii-Moriya相互作用。因此，界面的行为就像一个完美的波导，以传导位于带隙中的磁振子模式。这些模式即使在急剧弯曲的轨道中也不会受到反向散射的影响，具有抵抗疾病的能力，并在传播过程中保持高度的连贯性。我们设计了一个强力的Mach–Zehnder干涉仪，可以在不断变化的外部磁场或驱动频率下实现磁振信号的连续变化。我们的结果为实现受拓扑保护的磁振子波导并最终实现可扩展的低耗散自旋电子器件，甚至是大型集成电路提供了新的途径。