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Related Experiment Video

Updated: May 14, 2026

Scanning SQUID Study of Vortex Manipulation by Local Contact

Scanning SQUID Study of Vortex Manipulation by Local Contact

Published on: February 1, 2017

Electron vortex production and control using aberration induced diffraction catastrophes.

T C Petersen¹, M Weyland, D M Paganin

¹School of Physics, Monash University, Victoria 3800, Australia. timothy.petersen@monash.edu

Physical Review Letters

|February 5, 2013

Summary

This summary is machine-generated.

Electron diffraction catastrophes reveal vortex cores in electron beams. Researchers mapped orbital angular momentum density, observing vortex rings and topological reconnections using phase retrieval.

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Last Updated: May 14, 2026

Scanning SQUID Study of Vortex Manipulation by Local Contact

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Fabrication of Magnetic Nanostructures on Silicon Nitride Membranes for Magnetic Vortex Studies Using Transmission Microscopy Techniques

Fabrication of Magnetic Nanostructures on Silicon Nitride Membranes for Magnetic Vortex Studies Using Transmission Microscopy Techniques

Published on: July 2, 2018

Area of Science:

Electron microscopy
Optics
Materials science

Background:

Electron diffraction patterns can exhibit complex structures.
Vortices in wave phenomena are associated with topological defects.
Aberration correction enhances electron microscope resolution.

Purpose of the Study:

To investigate electron diffraction catastrophes.
To understand the formation and behavior of vortices in electron beams.
To map orbital angular momentum density in electron probes.

Main Methods:

Utilizing an aberration-corrected electron microscope.
Applying catastrophe theory and scalar diffraction integrals.
Employing focal-series phase retrieval to obtain wave function phases.

Main Results:

Observed arrays of intensity zeros forming vortex cores.
Successfully ascribed vortices to these arrays.
Mapped orbital angular momentum density for astigmatic electron probes.
Detected vortex rings and topological reconnections of nodal lines.

Conclusions:

Electron diffraction catastrophes provide a framework for understanding vortex formation.
Phase retrieval is crucial for analyzing electron probe topology.
The study demonstrates novel observations of vortex dynamics in electron beams.