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Domain wall interactions at a cross-shaped vertex.

L O'Brien1, A Beguivin, D Petit

  • 1Thin Film Magnetism Group, Cavendish Laboratory, University of Cambridge, JJ Thompson Avenue, Cambridge CB3 0HE, UK. laobrien@cam.ac.uk

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|November 21, 2012
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Investigating domain wall interactions in ferromagnetic nanowires revealed that repulsive forces can trigger depinning, while attractive forces cause asymmetric pinning, contradicting simple models and necessitating advanced characterization.

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Area of Science:

  • Spintronics
  • Condensed Matter Physics
  • Materials Science

Background:

  • Domain walls (DWs) in ferromagnetic materials are crucial for magnetic memory and logic devices.
  • Understanding DW interactions is key to optimizing device performance and stability.
  • Cross-shaped vertices in nanowires present complex geometries for DW manipulation.

Purpose of the Study:

  • To experimentally investigate the interaction of two domain walls at a cross-shaped vertex in ferromagnetic nanowires.
  • To probe both magnetostatically repulsive and attractive DW interactions.
  • To compare experimental findings with simple magnetostatic-charge-based arguments.

Main Methods:

  • Fabrication of a cross-shaped vertex from two ferromagnetic nanowires.
  • Experimental investigation of domain wall (DW) dynamics and pinning.
  • Analysis of magnetostatic interactions, including repulsive and attractive forces.

Main Results:

  • In repulsive interactions, a passing DW can induce depinning of a pinned DW.
  • This repulsive interaction effect is qualitatively explained by magnetostatic-charge arguments.
  • Attractive interactions lead to asymmetric pinning, with potential for complete depinning suppression.
  • Observed attractive interaction effects contradict simple charge-based arguments.

Conclusions:

  • Domain wall interactions at cross-shaped vertices are complex and depend on the nature of the magnetostatic force (repulsive or attractive).
  • Simple magnetostatic-charge arguments are insufficient for describing attractive DW interactions.
  • Full micromagnetic characterization is essential for understanding DW behavior in complex ferromagnetic nanostructures.