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Angular dependence of the magnetization relaxation in Co/Pt multilayers.
Anil Adhikari1, Bryce Herrington1, Nhat Nguyen1
1Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, NE 68588, United States of America.
Journal of Physics. Condensed Matter : an Institute of Physics Journal
|September 22, 2023
Summary
Defects in cobalt/platinum multilayers influence magnetization reversal. Domain wall propagation transitions from pinning-dominated to uniform switching as the measurement angle changes.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Defects in magnetic multilayers significantly impact their magnetic properties.
- Understanding magnetization reversal and relaxation mechanisms is crucial for developing advanced magnetic devices.
Purpose of the Study:
- To investigate the influence of defects on room-temperature magnetization reversal and relaxation in Co/Pt multilayers.
- To elucidate the transition in domain wall propagation mechanisms with varying measurement angles.
Main Methods:
- Angle-dependent magnetic viscosity measurements.
- Coercive field measurements.
- Kerr microscopy.
Main Results:
- A transition from pinning-dominated domain wall propagation to a combination of pinning-dominated and uniform switching was observed with increasing tilt angle.
- Dendritic domain wall propagation was identified as the dominant mechanism in nanogranular exchange-coupled films.
- Results were corroborated by relaxation time scaling and angular dependence of the coercive field.
Conclusions:
- Defect-induced domain wall dynamics play a critical role in the magnetic behavior of Co/Pt multilayers.
- The study provides insights into the fundamental mechanisms governing magnetization reversal in nanostructured magnetic materials.
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