软X射线矢量重叠关联成像直接观测三维拓扑自旋织构及其相互作用
Direct observation of 3D topological spin textures and their interactions using soft x-ray vector ptychography
摘要：
磁拓扑缺陷是一种能量稳定的自旋组态，其特征是对称性破缺。涡旋和skyrmions是两个著名的例子，二维自旋纹理，已积极研究的基本利益和实际应用。然而，3D自旋纹理的实验证据已经在很大程度上是间接的或定性的日期，由于定量表征它们在纳米体积内的困难。在这里，我们开发了软X射线矢量重叠图定量成像的三维磁化矢量场在一个挫折的超晶格与10 nm的空间分辨率。通过应用同伦理论的实验数据，我们量化的拓扑电荷的刺猬和反刺猬作为新兴的磁单极子和探测它们之间的相互作用的挫折超晶格。我们还直接观察到由磁惰性空隙产生的虚拟刺猬和反刺猬。我们希望这种新的定量成像方法将打开大门，研究在广泛的磁性材料的三维拓扑自旋纹理。我们的工作还表明，磁阻挫超晶格可以作为一个新的平台来研究刺猬相互作用和动力学，并利用优化的几何信息存储和传输应用。
英文摘要：
Magnetic topological defects are energetically stable spin configurations characterized by symmetry breaking. Vortices and skyrmions are two well-known examples of 2D spin textures that have been actively studied for both fundamental interest and practical applications. However, experimental evidence of the 3D spin textures has been largely indirect or qualitative to date, due to the difficulty of quantitively characterizing them within nanoscale volumes. Here, we develop soft x-ray vector ptychography to quantitatively image the 3D magnetization vector field in a frustrated superlattice with 10 nm spatial resolution. By applying homotopy theory to the experimental data, we quantify the topological charge of hedgehogs and anti-hedgehogs as emergent magnetic monopoles and probe their interactions inside the frustrated superlattice. We also directly observe virtual hedgehogs and anti-hedgehogs created by magnetically inert voids. We expect that this new quantitative imaging method will open the door to study 3D topological spin textures in a broad class of magnetic materials. Our work also demonstrates that magnetically frustrated superlattices could be used as a new platform to investigate hedgehog interactions and dynamics and to exploit optimized geometries for information storage and transport applications.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
