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Simultaneous Synthesis of Single-walled Carbon Nanotubes and Graphene in a Magnetically-enhanced Arc Plasma
Published on: February 2, 2012
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Magnetization Reversal Modes in Short Nanotubes with Chiral Vortex Domain Walls.
Ai Ping Chen1, Julian Gonzalez2, Konstantin Guslienko3,4
1Department Materials Physics, Faculty of Chemistry, University of the Basque Country, UPV/EHU, 20018 San Sebastián, Spain. aiping.chen@ehu.eus.
Materials (Basel, Switzerland)
|January 11, 2018
Summary
This study simulates magnetic nanotubes, revealing how domain wall length influences magnetization reversal. Shorter nanotubes flip uniformly, while longer ones form a central Néel domain wall that collapses at the switching field.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Magnetic nanotubes exhibit complex magnetization reversal behaviors.
- Understanding these behaviors is crucial for developing advanced magnetic storage and spintronic devices.
- The role of geometric parameters and anisotropy in domain wall formation is not fully elucidated.
Purpose of the Study:
- To investigate magnetization reversal mechanisms in finite-length magnetic nanotubes.
- To analyze the impact of nanotube dimensions (length, radius) and anisotropy on domain wall behavior.
- To determine the relationship between domain wall length and magnetization reversal modes.
Main Methods:
- Micromagnetic simulations were employed to model magnetization reversal.
- Simulations covered nanotubes with lengths of 1 and 2 μm and radii of 50 and 100 nm.
- The study focused on nanotubes with an easy axis parallel to the tube length, considering aspect ratios from 10 to 40.
Main Results:
- Vortex domain walls (DW) were identified at the ends of the nanotubes.
- The domain wall length was found to depend on geometric parameters and the anisotropy constant (K).
- For shorter nanotubes (L/L < 0.2), magnetization reversal occurred via flipping of the central uniform state. For longer nanotubes, a narrow Néel-type DW formed and subsequently collapsed at the switching field.
Conclusions:
- The length of the domain wall is a critical factor dictating the magnetization reversal mode and switching field in magnetic nanotubes.
- The formation and collapse of a central Néel domain wall is a key mechanism in longer nanotubes.
- These findings provide insights into the fundamental physics of magnetization reversal in confined magnetic nanostructures.
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