论文标题
散装晶格的三维中子远场断层扫描
Three-Dimensional Neutron Far-Field Tomography of a Bulk Skyrmion Lattice
论文作者
论文摘要
天空是拓扑保护的自旋纹理，这些旋转纹理被认为是在消失的磁化点上被核定和消灭的，称为Bloch点。但是，由于缺乏批量技术，由于三维中的缺陷，Skyrmion Lattices的实验可视化及其稳定性仍然难以捉摸。在这里，我们提出了一种应用于CO $ _8 $ ZN $ _8 $ _8 $ _4 $ _4 $ SKYRMION晶格主机的层析成像算法，处理多体散射测量值以生成大量旋转质地的平均散射特征重建（MSFR）。数字幻影验证了该算法；该样品的重建显示出一个无序的空中晶格，拓扑饱和为63〜 \％，通过两个不同的（抗）单极缺陷途径表现出三维拓扑过渡，密度为147〜 $ $ M $ M $ M $ M $ M $^{ - 3} $ and 21〜 $ \ $ \ $ \ MATHRM和MANTRAMENT和MANTRAMERTION我们的技术产生了散装天际晶格结构和缺陷实验知识的可视化，从而实现了对各种样本形状和化学，磁相和外部参数的未来批量研究。
Skyrmions are topologically-protected spin textures thought to nucleate and annihilate on points of vanishing magnetization, called Bloch points. However, owing to a lack of bulk techniques, experimental visualizations of skyrmion lattices and their stabilization through defects in three-dimensions remain elusive. Here, we present a tomographic algorithm applied to a Co$_8$Zn$_8$Mn$_4$ skyrmion lattice host, processing multi-projection small angle neutron scattering measurements to generate mean scattering feature reconstructions (MSFR) of the bulk spin textures. Digital phantoms validated the algorithm; reconstructions of the sample show a disordered skyrmion lattice with a topological saturation of 63~\%, exhibiting three-dimensional topological transitions through two different emergent (anti)monopole defect pathways with densities of 147~$μ$m$^{-3}$ and 21~$μ\mathrm{m}^{-3}$ for branching and segmentation events, respectively. Our techniques produce experimentally-informed visualizations of bulk skyrmion lattice structures and defects, enabling future bulk studies over a wide variety of sample shapes and chemistries, magnetic phases, and external parameters.
