Spectroscopic Imaging of Transition Metals

High angle annular dark-field (HAADF) and EELS spectrum imaging were performed on a Nion UltraSTEM 100 operated at 100 kV with a 30 mrad convergence semi-angle and a fifth-order aberration corrector. Spectra were acquired with a Gatan PEELS 666 spectrometer retrofitted with an Andor iXon 897 electron-multiplying charge-coupled device (EMCCD) camera. A dispersion of 1.2 eV per channel and an exposure time of 50 ms per spectra were used to record the oxygen K-edge, Mn and Ni L_2,3 edges and La M_4,5 edge in a 32 by 128 pixel spatial grid.

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Soltan S., Macke S., Ilse S.E., Pennycook T., Zhang Z.L., Christiani G., Benckiser E., Schütz G, & Goering E. (2023). Ferromagnetic order controlled by the magnetic interface of LaNiO3/La2/3Ca1/3MnO3 superlattices. Scientific Reports, 13, 3847.

Publication 2023

PEELS 666 spectrometer

Device Eels Electron Oxygen

Corresponding Organization : Helwan University

Other organizations : Max Planck Institute for Solid State Research, Max Planck Institute for Intelligent Systems, University of Antwerp, Erich Schmid Institute of Materials Science, Austrian Academy of Sciences

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Variable analysis

independent variables

Convergence semi-angle of 30 mrad
Electron beam accelerating voltage of 100 kV
Use of a fifth-order aberration corrector
Dispersion of 1.2 eV per channel
Exposure time of 50 ms per spectra

dependent variables

Oxygen K-edge
Mn and Ni L2,3 edges
La M4,5 edge

control variables

Use of a Nion UltraSTEM 100 microscope
Use of a Gatan PEELS 666 spectrometer retrofitted with an Andor iXon 897 EMCCD camera
Spatial grid of 32 by 128 pixels

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