Quantum sensing and imaging of spin‐orbit‐torque‐driven spin dynamics in noncollinear antiferromagnet Mn 3 Sn
Quantum sensing and imaging of spin‐orbit‐torque‐driven spin dynamics in noncollinear antiferromagnet Mn 3 Sn
复制标题
非共线反铁磁体 Mn 3 Sn 中自旋轨道扭矩驱动的自旋动力学的量子传感和成像
DOI：
10.1002/adma.202200327
复制
发表时间：
2022
影响因子：
29.4
通讯作者：
Wang, Hailong
中科院分区：
文献类型：
--
作者：
Yan, Gerald Q.;Li, Senlei;Lu, Hanyi;Huang, Mengqi;Xiao, Yuxuan;Wernert, Luke;Brock, Jeffrey A.;Fullerton, Eric E.;Chen, Hua;Wang, Hailong
具有自发时间反演对称性破缺、非平凡能带拓扑和非常规输运性质的新型非共线反铁磁体由于其丰富的物理性质和巨大的技术应用前景在过去十年中受到了极大的研究兴趣。这一新兴领域的中心焦点之一是探索微观磁结构和奇异材料特性之间的关系。在这里，报道了使用氮空位（NV）中心的非共线反铁磁体Mn 3Sn膜中的自旋轨道扭矩诱导的确定性磁开关和手性自旋旋转的纳米级成像。NV弛豫测量也证明了Mn 3Sn和邻近NV中心的自旋动力学之间的非共振偶极-偶极耦合的直接证据。这些结果表明NV中心在访问这些新兴量子材料中的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和磁性之间的相互作用提供了新的机会。
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 Mn3Sn films using nitrogen‐vacancy (NV) centers are reported. Direct evidence of the off‐resonance dipole–dipole coupling between the spin dynamics in Mn3Sn 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.