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. <br> 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. <br> The latest version of this Data Set can be found at the Zenodo DOI:<br> 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Fe₃GeTe₂中的历史依赖性畴结构与斯格明子形成》（原文标题：History-dependent domain and skyrmion formation in 2D van der Waals magnet Fe₃GeTe₂）的附图的全部实验数据，该论文作者为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。实验数据分析通过Python结合Jupyter笔记本完成，所用库包括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附图。 数据集按文件夹划分如下： 1. Characterisation_Data（表征数据集）：包含块状FGT材料与剥离薄片的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）及AFM（原子力显微镜，Atomic Force Microscopy）表征数据。 2. Magnetometry_Data（磁测量数据集）：包含利用MPM3磁强计采集的实验数据，用于研究块状FGT晶体的磁化强度随温度与外加磁场的变化规律。该数据集下设两个子文件夹，分别存储磁场平行于c轴（OOP——面外，Out of Plane）与垂直于c轴（IP——面内，In Plane）时采集的数据。 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。按论文正文所述的不同样品预处理历史（场扫描、场冷与零场冷）分为多个数据区段。该文件夹同时包含提取的斯格明子尺寸与条形畴尺寸数据，以及用于绘制论文中图3、4、5的Python脚本笔记本。 4. Spectra_Data（光谱数据集）：包含通过总电子产额法采集的块状FGT晶体X射线吸收光谱（块状光谱），以及通过透射法采集的剥离FGT薄片X射线吸收光谱（薄片光谱）。配套的Jupyter笔记本演示了对实验数据的绘图操作与XMCD（X射线磁圆二色性，X-ray Magnetic Circular Dichroism）求和规则的应用方法。 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，测量时分别改变了温度、外加磁场与多种倾斜角度。 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）与Python绘图脚本笔记本。汇总PDF文件展示了各温度下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。如有任何额外材料需求，欢迎联系Max Birch，电子邮箱：[e-mail]