Characterising the Holmium contribution to excitations in Holmium Iron Garnet

Rare-earth Iron garnets (R3Fe5O12) have been in the focus of active research for the last five decades due to properties such as magnetostriction, magneto-optical effects, as well as applications in spintronics and magnonics. With the notable exception of Yttrium Iron Garnet, very little work exists on momentum resolved studies of the magnetic excitations in these compounds. It is of both fundamental and practical interest to explore the effect of a magnetic A-site in these systems, particularly with regard to understanding how this is likely to affect functional properties such as the spin Seebeck effect and the magnon thermal conductivity. The core aim of this study supplement our recent high energy measurements by studying the low energy modes of Holmium Iron Garnet (which belong to Holmium A-site), and which will complete the picture on the exchange interactions for this material.

近五十年来，稀土铁石榴石（R₃Fe₅O₁₂）凭借磁致伸缩、磁光效应等特性，以及在自旋电子学（spintronics）与磁子学（magnonics）中的应用，始终是国际学界的活跃研究热点。值得注意的是，除钇铁石榴石（Yttrium Iron Garnet）外，针对这类化合物的磁激发开展动量分辨研究的相关工作仍较为匮乏。探索此类体系中钬A位（Holmium A-site）的磁效应对其功能属性的影响，尤其是厘清其对自旋塞贝克效应（spin Seebeck effect）与磁子热导率等关键性能的调控机制，兼具基础科学与实际应用价值。本研究的核心目标为：通过对属于钬A位的钬铁石榴石（Holmium Iron Garnet）的低能激发模式展开研究，补充我们此前的高能测量结果，从而完整揭示该材料的交换相互作用全貌。