Multi-angle Precession Electron Diffraction (MAPED): A Versatile Approach to 4D-STEM Precession.

Area of Science:

• Materials Science
• Electron Microscopy
• Crystallography

Background:

• Precession electron diffraction improves 4D-STEM data quality by averaging illumination angles.
• Conventional precession methods often require integrated hardware and software, limiting flexibility.
• Adapting precession techniques to non-integrated detectors can be challenging and time-consuming.

Purpose of the Study:

• Introduce multi-angle precession electron diffraction (MAPED) as a flexible alternative.
• Demonstrate MAPED's ability to improve strain and orientation mapping accuracy.
• Validate MAPED's versatility across different microscopes and detectors.

Main Methods:

• Collect sequential 4D-STEM datasets at multiple incident beam tilts.
• Average the collected diffraction datasets post-acquisition.
• Implement MAPED on various electron microscopes with different detector configurations.

Main Results:

• MAPED, even with four additional tilts, significantly improved strain and orientation measurements compared to single-tilt 4D-STEM.
• The averaging process minimizes the impact of Ewald sphere curvature and orientation.
• MAPED demonstrated versatility and flexibility across diverse experimental setups.

Conclusions:

• MAPED offers a robust and adaptable method for electron diffraction analysis.
• The technique enhances the accuracy of material property mapping in 4D-STEM.
• MAPED provides a valuable tool for researchers using non-integrated systems or seeking greater experimental flexibility.