Emergent and topological properties of 3D chiral gyroid nanostructures

本研究旨在研究三维纳米网络中形貌对磁性和自旋输运的影响。我们阐明了由手性3-连接节点组成的Ni陀螺体表现为具有高度取向相关磁阻的非共线、非Ising大自旋的受阻网络。我们成功地证明了Ni陀螺体既表现出强各向异性的自旋波输运，又表现出自旋波的势局域化。利用X射线纳米层析成像技术，我们成功地对由回旋体和非手性、4连接的单钻石网络自组装而成的3D样品进行了成像，量化了自组装过程中网络的扭曲，并首次揭示了扩展的液晶状拓扑缺陷。这些结果有望为设计和控制集体效应和拓扑效应带来新的方法，通过形态控制在自旋电子学和非传统计算应用中的磁网络。

This study aims to investigate the influence of morphology on magnetism and spin transport in 3D nanoscale networks. We clarified that Ni gyroids, composed of chiral 3-connected nodes, behave as frustrated networks of non-collinear, non-Ising macrospins with highly orientation-dependent magnetoresistance. We successfully demonstrated that Ni gyroids exhibit both strongly anisotropic spin-wave transport and potential localisation of spin waves. Using X-ray nanotomography, we succeeded in imaging in 3D samples fabricated by self-assembly of both gyroids and achiral, 4-connected single-diamond networks, quantifying the distortion of the network during self-assembly and for the first time revealing extended liquid-crystal-like topological defects. These results are expected to lead to new ways to design and control collective and topological effects via morphology control in magnetic networks for spintronics and unconventional computing applications.