Unraveling the mechanisms of magnetic interaction and magnetic tuning in topological Kagome magnets

There is a growing demand to uncover the magnetic structures of Kagome lattice magnets, RMn₆Sn₆, and distorted Kagome magnets, RAgGe (R = rare-earth element), which serve as unique platforms for studying the interplay between magnetism and electronic topology. Our study focuses on RMn₆Sn₆ (R = Tb, Y) and RAgGe (R = Ho, Tb), investigating frustration-induced orbital-spin interactions and their correlation with topological electronic bands, alongside experimental validation of exchange coupling and hybridization effects predicted by density functional theory (DFT). We will investigate magnetic moments in Ge and Sn, spin reorientations, spin-ice states in RAgGe, and exchange interactions of R-Mn in RMn₆Sn₆ by using X-ray magnetic circular dichroism.

作为研究磁相互作用与电子拓扑间耦合机制的独特实验平台，Kagome晶格磁体RMn₆Sn₆与畸变Kagome磁体RAgGe（其中R为稀土元素）的磁结构解析需求正日益凸显。本研究聚焦于RMn₆Sn₆（R=铽(Tb)、钇(Y)）与RAgGe（R=钬(Ho)、铽(Tb)）体系，旨在探究阻挫诱导的轨道-自旋相互作用及其与拓扑电子能带的关联，并对密度泛函理论（DFT）所预测的交换耦合与杂化效应开展实验验证。本研究将借助X射线磁圆二色性（X-ray magnetic circular dichroism）技术，对RAgGe体系中锗(Ge)与锡(Sn)的磁矩、自旋重取向现象、自旋冰态，以及RMn₆Sn₆体系中R-Mn间的交换相互作用展开研究。