Data set for: History-dependent domain and skyrmion formation in 2D van der Waals magnet Fe3GeTe2

This data repository contains the experimental data utilised to produce the figures shown in History-dependent domain and skyrmion formation in 2D van der Waals magnet Fe3GeTe2, by M. T. Birch, L. Powalla, S. Wintz, O. Hovorka, K. Litzius, J. C. Loudon, L. A. Turnbull, V. Nehruji, K. Son, C. Bubeck, T. G. Rauch, M. Weigand, E. Goering, M. Burghard, G. Schütz. Experimental data analysis were performed using Python via Jupyter notebooks, utilising matplotlib, scipy, numpy and h5py libraries. Jupyter notebooks are provided to process some of the experimental data to form the figures shown in the paper. Data data is divided into folders: Characterisation_Data - contains EDX, TEM and AFM characterisation of the bulk FGT material and exfoliated flakes. Magnetometry_Data - Includes data files from the MPM3 magnetometry utilised to study the magnetisation of the bulk FGT crystal as a function of temperature and applied magnetic field. The two sub folders divide the files into data acquired with the field applied either parallel to the c axis (OOP - out of plane), or perpendicular to the c axis (IP - in plane). STXM_Data - Contains Scanning Transmission X-ray Microscopy data acquired at the MAXYMUS instrument at the BESSY II synchrotron, Berlin. The data is divided into sections acquired following different sample histories, as reported in the main paper: field sweep, field-cooled and zero-field cooled. Folders containing the extracted skyrmion sizes and stripe domain sizes are included, as well as Python notebooks for plotting Fig. 3, 4 and 5 of the main paper. Spectra_Data - Contains x-ray absorption spectra acquired on a bulk FGT crystal via total electron yield method (Bulk spectra), and spectra acquired on the exfoliated FGT flake by a transmission method (Flake Spectra). The accompanying jupyter notebook demonstrates the plotting and application of XMCD sum rules to the experimental data. LTEM_Data - Contains images acquired via Lorentz Transmission Electron Microscopy of an FGT flake, measured as a function of temperature and applied magnetic field at various tilt angles. Analysis_Scripts - Contains python notebook for plotting the magnetic phase diagrams, and plotting the thickness dependence estimation from the x-ray absorption spectra data. Meanfield_Simulations - Contains the raw output files of the simulations, the .h5 files, and Python notebook plotting scripts. Summary pdf files show the output of all simulation runs for the field sweep performed at each temperature. The latest version of this Data Set can be found at the Zenodo DOI: 10.5281/zenodo.6346695 Any further requests for materials are welcome, send any inquiries to Max Birch at [e-mail]

本数据集仓库包含用于制作论文《二维范德瓦尔斯磁体（van der Waals magnet）Fe₃GeTe₂中的历史依赖性畴结构与斯格明子（skyrmion）形成》（原文标题：History-dependent domain and skyrmion formation in 2D van der Waals magnet Fe₃GeTe₂），作者为M. T. Birch、L. Powalla、S. Wintz、O. Hovorka、K. Litzius、J. C. Loudon、L. A. Turnbull、V. Nehruji、K. Son、C. Bubeck、T. G. Rauch、M. Weigand、E. Goering、M. Burghard、G. Schütz）中配图的全部实验数据。
实验数据分析通过Python结合Jupyter笔记本完成，所用工具库包括matplotlib、scipy、numpy与h5py。本仓库同时提供Jupyter笔记本，用于处理部分实验数据以生成论文中的配图。
本数据集按功能划分为多个文件夹：
1. Characterisation_Data（表征数据集）：包含块体FGT材料与机械剥离薄片的EDX（能量色散X射线光谱，Energy Dispersive X-ray Spectroscopy）、TEM（透射电子显微镜，Transmission Electron Microscopy）以及AFM（原子力显微镜，Atomic Force Microscopy）表征数据。
2. Magnetometry_Data（磁测量数据集）：包含采用MPM3磁强计采集的实验文件，用于研究块体FGT晶体的磁化强度随温度与外加磁场的变化关系。该数据集下设两个子文件夹，分别对应磁场平行于c轴（OOP - 面外，out of plane）与垂直于c轴（IP - 面内，in plane）的采集数据。
3. STXM_Data（扫描透射X射线显微镜数据集，Scanning Transmission X-ray Microscopy）：包含在柏林BESSY II同步辐射光源的MAXYMUS设备上采集的扫描透射X射线显微镜数据。数据按照论文主文所述的不同样品历史分为三类：场扫描、场冷却与零场冷却。文件夹中包含提取的斯格明子尺寸与条畴尺寸数据，以及用于绘制主文图3、4、5的Python笔记本脚本。
4. Spectra_Data（光谱数据集）：包含通过总电子产额法采集的块体FGT晶体X射线吸收光谱（块体光谱），以及通过透射法采集的剥离FGT薄片的X射线吸收光谱（薄片光谱）。配套的Jupyter笔记本展示了如何对实验数据进行绘图以及应用XMCD（X射线磁圆二色性，X-ray Magnetic Circular Dichroism）求和规则。
5. LTEM_Data（洛伦兹透射电子显微镜数据集，Lorentz Transmission Electron Microscopy）：包含通过洛伦兹透射电子显微镜采集的FGT薄片图像，这些图像是在不同样品倾斜角度下，随温度与外加磁场变化的测量结果。
6. Analysis_Scripts（分析脚本）：包含用于绘制磁相图以及基于X射线吸收光谱数据估算厚度依赖性的Python笔记本。
7. Meanfield_Simulations（平均场模拟数据集）：包含模拟的原始输出文件（.h5格式文件）以及用于绘图的Python笔记本脚本。汇总PDF文件展示了在各温度下开展的场扫描模拟的全部运行结果。
本数据集的最新版本可通过Zenodo DOI：10.5281/zenodo.6346695获取。如有任何进一步的材料咨询，请联系Max Birch，邮箱地址为[e-mail]