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Universal Hopping Motion Protected by Structural Topology.

Moojune Song1, Mujin You1, Seungmo Yang2

  • 1Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Republic of Korea.

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|August 19, 2022
PubMed
Summary
This summary is machine-generated.

Magnetic skyrmions exhibit a distinct hopping behavior, unlike magnetic domain walls, due to their unique structure. This finding reveals a new dynamic phase governed by topological properties beyond charge.

Keywords:
creephoppingmagnetic skyrmionsstructural topologyuniversality

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Statistical Mechanics

Background:

  • Scaling laws reveal universal behaviors across diverse physical phenomena.
  • Understanding these laws helps classify systems and discover new dynamic phases.
  • Magnetic skyrmions and domain walls (DWs) are key subjects in condensed matter physics.

Purpose of the Study:

  • Investigate the scaling law governing the dynamics of weakly driven magnetic skyrmions.
  • Compare the skyrmion scaling law with that of magnetic domain wall creep.
  • Determine the underlying principles governing skyrmion dynamics and their universality class.

Main Methods:

  • Experimental investigation of weakly driven magnetic skyrmion dynamics.
  • Comparative analysis of scaling laws for skyrmions and magnetic domain walls.
  • Examination of scaling laws with and without skyrmion topological charge.

Main Results:

  • Magnetic skyrmions do not follow the 2D domain wall creep scaling law.
  • Skyrmions exhibit a hopping behavior analogous to 1D confined particle-like DWs.
  • This hopping behavior persists even after removing the skyrmion's topological charge.

Conclusions:

  • The distinct scaling behavior arises from the intrinsic structural topology of magnetic textures, not solely topological charge.
  • Skyrmion hopping is attributed to bottleneck processes caused by diverging collective lengths in closed-shape spin structures.
  • Structural topology dictates the universality class of weakly driven motion, differentiating it from magnetic DW creep universality.