Unidirectional motion of topological defects mediating continuous rotation processes.
Marisel Di Pietro Martínez1,2, Luke Alexander Turnbull1,2, Jeffrey Neethirajan1
1Max Planck Institute for Chemical Physics of Solids, Dresden, Germany.
Npj Spintronics
|November 20, 2025
Summary
Researchers achieved controlled, unidirectional motion of magnetic dislocations in thin films without structural patterns. This breakthrough enables tunable defect movement, paving the way for novel information carrier manipulation.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Topological defects are crucial for phase transitions and information transfer.
- Controlling defect motion, especially along defined paths, is challenging without structural patterning.
Purpose of the Study:
- To demonstrate tunable, unidirectional motion of topological defects in a laterally unconfined thin film.
- To investigate the role of magnetic dislocations in mediating stripe pattern rotation.
- To establish a framework for controlling defect behavior in unconfined systems.
Main Methods:
- Demonstration of tunable, unidirectional motion of magnetic dislocations.
- 3D magnetic vectorial imaging with in situ magnetic fields.
- Development of a minimal model for dislocations in stripe patterns.
Main Results:
- Achieved tunable, unidirectional motion of magnetic dislocations in an unconfined thin film.
- Observed defect motion mediating continuous rotation of the stripe pattern.
- Connected dislocation motion to the 3D magnetic structure and external magnetic field effects.
- Validated a minimal model reproducing observed dislocation and stripe rotation dynamics.
Conclusions:
- Established a method for controlled, unidirectional motion of topological defects in unconfined systems.
- Highlighted the potential for designing materials for precise defect manipulation.
- Opened new avenues for information carrier control in higher-dimensional systems.
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