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Multiple Walker breakdowns in magnetic multilayers.

Joon Moon1, Jaesung Yoon1, Kitae Kim1

  • 1Department of Physics and Astronomy, Seoul National University, Seoul, 08826, Republic of Korea.

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|February 11, 2022
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Summary
This summary is machine-generated.

Exotic domain-wall dynamics in magnetic multilayer films exhibit double Walker breakdowns due to antisymmetric internal magnetic fields. This phenomenon creates distinct phases and velocity minima, offering insights into magnetic material behavior.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Domain walls in magnetic materials are crucial for data storage and spintronic devices.
  • Understanding domain wall dynamics, particularly breakdown phenomena, is key to optimizing device performance.

Purpose of the Study:

  • To investigate exotic domain-wall dynamics in magnetic multilayer films.
  • To identify and characterize the phenomenon of double Walker breakdowns.
  • To elucidate the role of internal magnetic fields in domain wall behavior.

Main Methods:

  • Utilized micromagnetic simulations to model domain-wall dynamics.
  • Analyzed the influence of internal magnetic dipole fields on domain wall motion.
  • Developed a phase diagram illustrating domain-wall dynamics and breakdown fields.

Main Results:

  • Observed and reported double Walker breakdowns in two-layered magnetic films.
  • Attributed multiple breakdowns to antisymmetric internal magnetic dipole fields.
  • Identified four distinct phases of domain-wall dynamics, defining phase boundaries for double Walker breakdown fields.

Conclusions:

  • Double Walker breakdowns are a significant feature in specific magnetic multilayer systems.
  • The observed dynamics and phase diagram provide a framework for understanding complex domain wall behavior.
  • The findings contribute to the fundamental understanding of magnetic domain wall physics and potential applications.