Dataset Open Access

Synthetic 4D STEM dataset based on a SrTiO3 supercell with two additional artificial spatial frequencies

Strauch, Achim; Weber, Dieter; Clausen, Alexander; Müller-Caspary, Knut

This dataset allows to investigate phase contrast methods for 4D scanning transmission electron microscopy, such as ptychography.

A synthetic dataset has been simulated, based on an SrTiO3 unit cell as a starting point. Then, a five by five super cell was created by repetition. Two artificial spatial frequencies were added to the phase grating, one with a wavelength of a single unit cell and one with a wavelength of the super cell. To eliminate dynamical scattering, a 4D-STEM simulation with 20 × 20 scan points per unit cell was performed using only one slice with a thickness of one unit cell along electron beam direction [001].


  • conf_01.mat: HDF5 file with the phase grating.
  • Data extraction and plot of the phase grating.ipynb: Jupyter notebook showing how to access the phase grating file and plot the data.
  • slice_00001_thick_1.9525_nm_blocksz100.raw: Simulated 4D STEM dataset as a raw binary file. Shape 100 x 100 x 596 x 596, dtype float32.
  • ssb-example.ipynb: Jupyter notebook showing first moment analysis and ptychography with the dataset.

Simulation parameters

  • Scan points: 100x100
  • Field of view: 1.9525nm
  • Convergence angle: 23mrad, 136 px
  • Acceleration voltage: 300 kV
  • Center: (297, 297)
  • Rotation angle: 0°
Achim Strauch and Knut Müller-Caspary were supported by funding from the Initiative and Network Fund of the Helmholtz Association (Germany) under contract VH-NG-1317 (moreSTEM project). Knut Müller-Caspary acknowledges support from Helmholtz within the project "Ptychography 4.0" under contract ZT-I-0025.
Files (14.2 GB)
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Data extraction and plot of the phase grating.ipynb
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  • Live processing of momentum-resolved STEM data for first moment imaging and ptychography. Achim Strauch, Dieter Weber, Alexander Clausen, Anastasiia Lesnichaia, Arya Bangun, Benjamin März, Feng Jiao Lyu, Qing Chen, Andreas Rosenauer, Rafal Dunin-Borkowski, Knut Müller-Caspary. arXiv:2106.13457

  • Weber, Dieter, Lesnichaia, Anastasiia, Strauch, Achim, Clausen, Alexander, Bangun, Arya, Melnyk, Oleh, … Müller-Caspary, Knut. (2021, July 1). Ptychography 4.0: 0.1.0 (Version 0.1.0). Zenodo.

  • Clausen, Alexander, Weber, Dieter, Ruzaeva, Karina, Migunov, Vadim, Baburajan, Anand, Bahuleyan, Abijith, … Dunin-Borkowski, Rafal E. (2021, July 8). LiberTEM/LiberTEM: 0.7.1 (Version 0.7.1). Zenodo.

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