层状钆磁体中的磁性阻挫与非共线纹理
Magnetic frustration and non-collinear textures in layered Gd magnets
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中文总结 AI 辅助
研究人员通过跨尺度模拟分析层状钆基磁体的磁性，确认磁性阻挫与偶极相互作用对非共线及斯格明子相的关键作用，提出化学调控方案以制备宽磁场稳定的新型斯格明子。
中文摘要 AI 辅助
基于电子结构理论与原子自旋动力学的跨尺度模拟，我们研究了斯格明子型层状稀土磁体GdRu$_2$Si$_2$、GdRu$_2$Ge$_2$，以及类似的钆基化合物GdAu$_2$Si$_2$、GdAu$_2$Ge$_2$、GdAg$_2$Si$_2$、GdAg$_2$Ge$_2$的磁性。通过研究该结构家族的趋势，我们确认了磁性阻挫与偶极相互作用对非共线相和斯格明子相稳定性的重要性。此外，我们的计算预测了这些磁体在各类交换相互作用平衡与磁各向异性特性方面的化学调控潜力，这类调控会催生在宽外加磁场范围内稳定的新型斯格明子。特别地，我们提出在GdRu$_2$Si$_2$中部分碱金属取代Gd，形成GdKRu$_4$Si$_4$、GdRbRu$_4$Si$_4$、GdCsRu$_4$Si$_4$及GdYRu$_4$Si$_4$化合物，推测其将形成有序层状结构，与此前报道的铁 pnictides（如CaKFe$_4$As$_4$）类似。
英文摘要
Using scale-bridging simulations based on electronic structure theory and atomistic spin dynamics, we investigate the magnetic properties of skyrmionic GdRu$_2$Si$_2$ and GdRu$_2$Ge$_2$ layered rare-earth magnets and similar Gd-based compounds (GdAu$_2$Si$_2$, GdAu$_2$Ge$_2$, GdAg$_2$Si$_2$ and GdAg$_2$Ge$_2$). By studying the trends across this structural family, we confirm the importance of magnetic frustration and dipolar interactions for the stability of non-collinear and skyrmion phases. Furthermore, our calculations predict promising opportunities for chemical tuning of these magnets in terms of the balance between various exchange interactions and the character of the magnetic anisotropy. These changes lead to the formation of new types of skyrmions that are stable in a wide range of applied external magnetic field. In particular, we propose partial alkali-metal substitution of Gd in GdRu$_2$Si$_2$ leading to GdKRu$_4$Si$_4$, GdRbRu$_4$Si$_4$, GdCsRu$_4$Si$_4$ as well as GdYRu$_4$Si$_4$ compounds, and suggest that it is likely to result in an ordered layered structure, similarly to previously reported iron pnictides like CaKFe$_4$As$_4$.
发表机构
- Uppsala University（乌普萨拉大学）
- KTH Royal Institute of Technology（皇家理工学院）
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