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Micromagnetic study of domain wall dynamics in bit-patterned nanodots.
Journal of Applied Physics
|June 2, 2009
Summary
Domain wall dynamics in magnetic nanostructures are simulated. Finite thickness causes velocity phase shifts and halved oscillation frequency, impacting data storage stability.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Domain wall dynamics are crucial for understanding magnetization reversal in bit-patterned arrays.
- Key factors include writability, data rate, and bit stability.
Purpose of the Study:
- Investigate domain wall dynamics in disk-shaped nanostructures with perpendicular anisotropy.
- Analyze the effects of finite thickness and demagnetizing fields on domain wall motion.
Main Methods:
- Micromagnetic simulations were employed.
- Focus on disk-shaped nanostructures with large built-in perpendicular anisotropy.
Main Results:
- Domain wall motion enters the supercritical regime due to strong demagnetizing effects.
- Finite thickness induces a 90-degree phase shift in wall velocity.
- Wall velocity increases away from the center, halving oscillation frequency.
- At large diameters, acceleration decreases and periodicity is lost.
- Multiple spin wave modes are observed, with phase cancellation reducing wall acceleration.
Conclusions:
- Finite thickness and asymmetry significantly influence domain wall behavior.
- These dynamics affect the performance and stability of magnetic nanostructures.
- Understanding these effects is vital for advancing magnetic data storage technologies.
