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Dipolar interactions, not just the Dzyaloshinskii-Moriya interaction, can stabilize chiral magnetic domain walls. This study provides experimental evidence and explores the interplay between these forces in Pt/CoB/Ir multilayers.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Chiral magnetic domain walls and skyrmions are typically stabilized by the Dzyaloshinskii-Moriya interaction.
  • Previous theoretical predictions suggested dipolar interactions could also play a role, but experimental validation was lacking.

Purpose of the Study:

  • To provide direct experimental evidence for the stabilization of chiral domain walls by dipolar interactions.
  • To investigate the competition between Dzyaloshinskii-Moriya and dipolar interactions.
  • To explore tailoring chiral magnetism through interaction control.

Main Methods:

  • Direct imaging of magnetic domain walls using scanning electron microscopy with polarization analysis.
  • Utilizing archetype Pt/CoB/Ir thin film multilayers.
  • Systematically varying magnetic layer thickness to observe chirality reversal.

Main Results:

  • Demonstrated that dipolar interactions can stabilize chiral domain walls.
  • Observed a reversal of domain wall chirality as a function of magnetic layer thickness, indicating competing interactions.
  • Provided experimental evidence for the significant role of dipolar interactions in chiral spin textures.

Conclusions:

  • Dipolar interactions are a key factor in stabilizing chiral magnetic domain walls and skyrmions.
  • The competition between Dzyaloshinskii-Moriya and dipolar interactions can be tuned, offering new pathways for controlling chiral magnetism.
  • This research opens avenues for novel spintronic device applications by balancing fundamental magnetic interactions.