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Propagation of Spin Waves in a 2D Vortex Network.

Zhenghua Li1, Bin Dong1, Yangyang He1

  • 1Key Laboratory of New Energy and Rare Earth Resource Utilization of State Ethnic Affairs Commission, School of Physics and Materials Engineering, Dalian Minzu University, Dalian, 116600, China.

Nano Letters
|May 20, 2021
PubMed
Summary

Researchers demonstrated a new 2D vortex network for guiding spin waves. This breakthrough enables efficient propagation in higher-order magnonic structures, advancing miniaturized magnonic devices.

Keywords:
Coupled vortexDomain wallMagnetic vortexMicromagneticsSpin wave

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Efficient spin wave propagation is key for future magnonic devices.
  • Current magnonic devices are limited to double vortex structures for spin wave emission/oscillation.
  • Propagation of spin waves in higher-order vortices remains unexplored.

Purpose of the Study:

  • To experimentally realize and investigate spin wave propagation in a higher-order vortex.
  • To utilize a designed nanostructure as a waveguide for short-wavelength spin waves.

Main Methods:

  • Fabrication of a higher-order vortex (2D vortex network) using a designed nanostructure with four cross-type chiral substructures.
  • Experimental propagation of short-wavelength (∼100 nm) spin waves through the vortex network.
  • Analysis of spin wave propagation via nanochannels formed by Bloch-Néel-type domain walls.

Main Results:

  • Successful realization of a higher-order vortex network capable of guiding spin waves.
  • Demonstrated propagation of spin waves from one vortex into the network.
  • Observed spin wave propagation with a decay length of several micrometers through domain wall nanochannels.

Conclusions:

  • The developed 2D vortex network serves as an effective waveguide for short-wavelength spin waves.
  • This work overcomes limitations of double vortex structures, enabling spin wave propagation in higher-order systems.
  • The technique offers a pathway for developing low-energy, reprogrammable, and miniaturized magnonic devices.