Li Zhenghua, Dong Bin, He Yangyang, Chen Aiying, Li Xiang, Tian Jing-Hua, Yan Chenglin
Key Laboratory of New Energy and Rare Earth Resource Utilization of State Ethnic Affairs Commission, School of Physics and Materials Engineering, Dalian Minzu University, Dalian, 116600, China.
School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China.
Nano Lett. 2021 Jun 9;21(11):4708-4714. doi: 10.1021/acs.nanolett.1c00971. Epub 2021 May 20.
Efficient propagation of spin waves in a magnetically coupled vortex is crucial to the development of future magnonic devices. Thus far, only a double vortex can serve as spin-wave emitter or oscillator; the propagation of spin waves in the higher-order vortex is still lacking. Here, we experimentally realize a higher-order vortex (2D vortex network) by a designed nanostructure, containing four cross-type chiral substructures. We employ this vortex network as a waveguide to propagate short-wavelength spin waves (∼100 nm) and demonstrate the possibility of guiding spin waves from one vortex to the network. It is observed that the spin waves can propagate into the network through the nanochannels formed by the Bloch-Néel-type domain walls, with a propagation decay length of several micrometers. This technique paves the way for the development of low-energy, reprogrammable, and miniaturized magnonic devices.
自旋波在磁耦合涡旋中的高效传播对于未来磁子器件的发展至关重要。到目前为止，只有双涡旋可以用作自旋波发射器或振荡器；高阶涡旋中自旋波的传播仍有待研究。在这里，我们通过设计包含四个交叉型手性子结构的纳米结构，实验实现了高阶涡旋（二维涡旋网络）。我们将这个涡旋网络用作波导来传播短波长自旋波（~100 nm），并证明了将自旋波从一个涡旋引导到网络中的可能性。观察到自旋波可以通过由布洛赫-尼尔型畴壁形成的纳米通道传播到网络中，传播衰减长度为几微米。这项技术为低能量、可重新编程和小型化磁子器件的发展铺平了道路。
