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Single-pass STEM-EMCD on a zone axis using a patterned aperture: progress in experimental and data treatment methods.

Thomas Thersleff1, Linus Schönström2,3, Cheuk-Wai Tai2

  • 1Stockholm University, Department of Materials and Environmental Chemistry, 10691, Stockholm, Sweden. thomas.thersleff@mmk.su.se.

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Summary
This summary is machine-generated.

This study advances electron magnetic circular dichroism (EMCD) for atomic-resolution magnetic moment measurements in materials. We detail progress in overcoming experimental and data processing challenges for single-pass EMCD, paving the way for new discoveries.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Electron Microscopy

Background:

  • Measuring magnetic moments at atomic resolution is crucial for understanding ferromagnetic materials.
  • The electron magnetic circular dichroism (EMCD) technique in (scanning) transmission electron microscopy ((S)TEM) offers theoretical potential for this.
  • Current experimental and data processing challenges hinder the practical application of EMCD for atomic-resolution magnetic measurements.

Purpose of the Study:

  • To detail experimental and data processing advancements towards achieving single-pass zone-axis EMCD.
  • To develop a comprehensive data acquisition and analysis strategy for EMCD experiments.
  • To demonstrate the feasibility of extracting EMCD signals sensitive to crystallographic orientation and momentum transfer.

Main Methods:

  • Utilized a patterned aperture to facilitate single-pass zone-axis EMCD measurements.
  • Developed a comprehensive data acquisition and analysis strategy applicable to EMCD experiments.
  • Performed experiments to extract EMCD signals at low spatial resolution.

Main Results:

  • Demonstrated promising electron magnetic circular dichroism (EMCD) candidate signals at low spatial resolution.
  • Showed that the extracted EMCD signals are sensitive to both crystallographic orientation and momentum transfer.
  • Detailed a data acquisition and analysis strategy designed to scale to atomic resolution experiments.

Conclusions:

  • Progress has been made in overcoming experimental and data processing hurdles for atomic-resolution EMCD.
  • The developed methods show promise for reliable detection and quantification of weak EMCD signals.
  • This work lays the foundation for future single-pass zone-axis EMCD experiments at atomic resolution.