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Controlled Individual Skyrmion Nucleation at Artificial Defects Formed by Ion Irradiation
Kayla Fallon1, Sean Hughes1, Katharina Zeissler2,3
1SUPA School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, UK.
Small (Weinheim an Der Bergstrasse, Germany)
|March 7, 2020
Summary
Researchers developed a new method to create magnetic skyrmions at nanoscale defects. This technique enhances skyrmion stability and localization, paving the way for advanced spintronic devices.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Magnetic skyrmions are topologically protected quasiparticles with potential for spintronic applications.
- Controlling skyrmion nucleation and stability is crucial for device integration.
- Existing methods face challenges in precise control and material compatibility.
Purpose of the Study:
- To report a novel method for controlled skyrmion nucleation at engineered nanoscale defects.
- To investigate the advantages of defect-mediated skyrmion formation.
- To explore the influence of defect size on skyrmion characteristics.
Main Methods:
- Focused ion beam irradiation to create controlled nanoscale defects in magnetic multilayer samples.
- Utilizing samples with interfacial Dzyaloshinskii-Moriya interaction.
- Employing transmission electron microscopy techniques to analyze magnetic behavior and defect structure.
Main Results:
- Successfully nucleated skyrmions at localized nanoscale defect sites.
- Achieved enhanced skyrmion stability over a wider range of external fields, including zero field.
- Demonstrated skyrmion existence in materials previously unsuitable for field-cycling nucleation.
- Observed that defect-nucleated skyrmion size is independent of defect size when defects are smaller than skyrmions.
Conclusions:
- Engineered nanoscale defects provide a robust platform for controlled magnetic skyrmion nucleation.
- The defect-mediated method offers significant advantages in stability, localization, and material applicability.
- This approach is a promising step towards the realization of practical skyrmion-based spintronic devices.
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