Song Jeongkeun, Oh Taekoo, Ko Eun Kyo, Lee Ji Hye, Kim Woo Jin, Zhu Yangyu, Yang Bohm-Jung, Li Yangyang, Noh Tae Won
Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul, 08826, Korea.
Department of Physics and Astronomy, Seoul National University, Seoul, 08826, Korea.
Nat Commun. 2022 Oct 30;13(1):6501. doi: 10.1038/s41467-022-34189-6.
Antiferromagnetic (AFM) materials are attracting tremendous attention due to their spintronic applications and associated novel topological phenomena. However, detecting and identifying the spin configurations in AFM materials are quite challenging due to the absence of net magnetization. Herein, we report the practicality of utilizing the planar Hall effect (PHE) to detect and distinguish "cluster magnetic multipoles" in AFM NdIrO (NIO-227) fully strained films. By imposing compressive strain on the spin structure of NIO-227, we artificially induced cluster magnetic multipoles, namely dipoles and A- and T-octupoles. Importantly, under magnetic field rotation, each magnetic multipole exhibits distinctive harmonics of the PHE oscillation. Moreover, the planar Hall conductivity has a nonlinear magnetic field dependence, which can be attributed to the magnetic response of the cluster magnetic octupoles. Our work provides a strategy for identifying cluster magnetic multipoles in AFM systems and would promote octupole-based AFM spintronics.
反铁磁（AFM）材料因其在自旋电子学中的应用以及相关的新型拓扑现象而备受关注。然而，由于缺乏净磁化强度，检测和识别AFM材料中的自旋构型极具挑战性。在此，我们报道了利用平面霍尔效应（PHE）来检测和区分完全应变的AFM钕铱氧化物（NIO-227）薄膜中“团簇磁多极子”的实用性。通过对NIO-227的自旋结构施加压缩应变，我们人工诱导出了团簇磁多极子，即偶极子以及A-八极子和T-八极子。重要的是，在磁场旋转时，每个磁多极子都表现出PHE振荡的独特谐波。此外，平面霍尔电导率具有非线性磁场依赖性，这可归因于团簇磁八极子的磁响应。我们的工作为识别AFM系统中的团簇磁多极子提供了一种策略，并将推动基于八极子的AFM自旋电子学发展。
