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Related Experiment Videos

Atom size electron vortex beams with selectable orbital angular momentum.

Darius Pohl1, Sebastian Schneider2,3, Paul Zeiger4

  • 1IFW Dresden, Institute for Metallic Materials, Helmholtzstrasse 20, D-01069, Dresden, Germany. d.pohl@ifw-dresden.de.

Scientific Reports
|April 21, 2017
PubMed
Summary

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Noise estimation and suppression in quantitative EMCD measurements.

Ultramicroscopy·2026

Researchers developed a new transmission electron microscopy setup to create electron vortex beams. This advancement enables atomic resolution imaging, a key step for future magnetic characterization using electron energy-loss magnetic chiral dichroism (EMCD).

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Electron Microscopy

Background:

  • Modern magnetic materials and devices require high-resolution magnetic characterization due to their decreasing size.
  • Transmission electron microscopy (TEM) offers potential for quantitative magnetic measurements.
  • Electron energy-loss magnetic chiral dichroism (EMCD) is a promising technique for such characterization.

Purpose of the Study:

  • To develop a reliable and robust electron-optical setup for generating and controlling electron vortex beams.
  • To enable atomic resolution structural and spectroscopic imaging using these beams.
  • To establish prerequisites for future atomic-resolution EMCD investigations.

Main Methods:

  • Utilized a high-resolution scanning TEM with a probe aberration corrector.

Related Experiment Videos

  • Integrated a vortex-generating fork aperture and a miniaturized aperture for vortex selection.
  • Generated and controlled user-selectable single-state electron vortex beams with defined orbital angular momenta.

    • Main Results:

    • Demonstrated the formation of atom-sized probes from electron vortices.
    • Showcased the capability of these probes for atomic resolution structural imaging.
    • Showcased the capability of these probes for atomic resolution spectroscopic imaging.

    Conclusions:

    • The developed setup reliably generates and controls electron vortex beams.
    • Atom-sized probes formed from these beams are suitable for atomic resolution imaging.
    • This work is a critical step towards advancing atomic-resolution EMCD for magnetic materials.