Emergent and topological properties of 3D chiral gyroid nanostructures

本研究旨在探讨三维纳米网络中形貌对磁性和自旋输运的影响。我们澄清了Ni陀螺，由手性3连接节点组成，表现为具有高度定向依赖磁电阻的非共线，非伊辛大自旋的受挫网络。我们成功地证明了Ni陀螺具有强各向异性自旋波输运和自旋波的潜在局域化。利用x射线纳米层析成像技术，我们成功地对自组装的陀螺仪和非手性4连接单金刚石网络制作的3D样品进行了成像，量化了自组装过程中网络的畸变，并首次揭示了扩展的液晶样拓扑缺陷。这些结果有望通过自旋电子学和非常规计算应用中的磁网络形态控制来设计和控制集体效应和拓扑效应。

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.