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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
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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
PubMed
Summary
This summary is machine-generated.

Defects in cobalt/platinum multilayers influence magnetization reversal. Domain wall propagation transitions from pinning-dominated to uniform switching as the measurement angle changes.

Keywords:
magnetization relaxationmagnetometryperpendicular magnetic anisotropy

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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.