Direct visualization of the three-dimensional shape of skyrmion strings in a noncentrosymmetric magnet
Direct visualization of the three-dimensional shape of skyrmion strings in a noncentrosymmetric magnet
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DOI：
10.1038/s41563-021-01141-w
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发表时间：
2021-11-11
期刊：
影响因子：
41.2
通讯作者：
Ono, T.
中科院分区：
文献类型：
--
作者：
Seki, S.;Suzuki, M.;Ono, T.
作者利用外加磁场下的标量磁x射线层析成像，直接可视化了单个斯基米子弦的三维形状。磁skyrmions是拓扑稳定的旋转自旋纹理，在二维（2D）系统中表现为粒子状物体。本文利用外加磁场下的标量磁x射线层析成像技术，直接可视化了室温含skyrμ子的非中心对称化合物Mn1.4Pt0.9Pd0.1Sn中单个skyrμ子弦的三维形状。基于不同角度拍摄的透射图像，通过层析重建[001]磁化分量的三维分布，我们确定了贯穿整个样品厚度的skyrmion弦，以及各种缺陷结构，如中断和y形弦。观察到的点缺陷可能代表作为紧急磁单极子的布洛赫点，正如理论上提出的那样。我们使用可调磁场的层析成像方法为在3D空间中直接可视化单个skyrmion弦的结构动力学铺平了道路，这将有助于更好地理解这些拓扑对象的产生，湮灭和转移。
The authors use scalar magnetic X-ray tomography under applied magnetic fields to directly visualize the three-dimensional shape of individual skyrmion strings.Magnetic skyrmions are topologically stable swirling spin textures that appear as particle-like objects in two-dimensional (2D) systems. Here, utilizing scalar magnetic X-ray tomography under applied magnetic fields, we report the direct visualization of the three-dimensional (3D) shape of individual skyrmion strings in the room-temperature skyrmion-hosting non-centrosymmetric compound Mn1.4Pt0.9Pd0.1Sn. Through the tomographic reconstruction of the 3D distribution of the [001] magnetization component on the basis of transmission images taken at various angles, we identify a skyrmion string running through the entire thickness of the sample, as well as various defect structures, such as the interrupted and Y-shaped strings. The observed point defect may represent the Bloch point serving as an emergent magnetic monopole, as proposed theoretically. Our tomographic approach with a tunable magnetic field paves the way for direct visualization of the structural dynamics of individual skyrmion strings in 3D space, which will contribute to a better understanding of the creation, annihilation and transfer of these topological objects.