Yan Gerald Q, Li Senlei, Lu Hanyi, Huang Mengqi, Xiao Yuxuan, Wernert Luke, Brock Jeffrey A, Fullerton Eric E, Chen Hua, Wang Hailong, Du Chunhui Rita
Department of Physics, University of California, La Jolla, San Diego, CA, 92093, USA.
Center for Memory and Recording Research, University of California, La Jolla, San Diego, CA, 92093-0401, USA.
Adv Mater. 2022 Jun;34(23):e2200327. doi: 10.1002/adma.202200327. Epub 2022 Apr 30.
Novel non-collinear antiferromagnets with spontaneous time-reversal symmetry breaking, non-trivial band topology, and unconventional transport properties have received immense research interest over the past decade due to their rich physics and enormous promise in technological applications. One of the central focuses in this emerging field is exploring the relationship between the microscopic magnetic structure and exotic material properties. Here, nanoscale imaging of both spin-orbit-torque-induced deterministic magnetic switching and chiral spin rotation in non-collinear antiferromagnet Mn Sn films using nitrogen-vacancy (NV) centers are reported. Direct evidence of the off-resonance dipole-dipole coupling between the spin dynamics in Mn Sn and proximate NV centers is also demonstrated by NV relaxometry measurements. These results demonstrate the unique capabilities of NV centers in accessing the local information of the magnetic order and dynamics in these emergent quantum materials and suggest new opportunities for investigating the interplay between topology and magnetism in a broad range of topological magnets.
在过去十年中，具有自发时间反演对称性破缺、非平凡能带拓扑结构和非常规输运特性的新型非共线反铁磁体因其丰富的物理性质和在技术应用中的巨大潜力而受到了广泛的研究关注。这一新兴领域的核心关注点之一是探索微观磁结构与奇异材料特性之间的关系。在此，报道了利用氮空位（NV）中心对非共线反铁磁体Mn Sn薄膜中自旋轨道扭矩诱导的确定性磁开关和手性自旋旋转进行纳米级成像。NV弛豫测量还证明了Mn Sn中的自旋动力学与邻近NV中心之间非共振偶极-偶极耦合的直接证据。这些结果展示了NV中心在获取这些新兴量子材料中磁序和动力学的局部信息方面的独特能力，并为研究广泛的拓扑磁体中拓扑与磁性之间的相互作用提供了新的机会。
