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  3. Picosecond-scale Coherent Toggle Switching Of Topological Spin Helicity.
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  3. Picosecond-scale Coherent Toggle Switching Of Topological Spin Helicity.

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Picosecond-scale coherent toggle switching of topological spin helicity.

Can Liu1, Zefang Li1, Xuange Hu1

  • 1Ultrafast Electron Microscopy Laboratory, The MOE Key Laboratory of Weak-Light Nonlinear Photonics, School of Physics, Nankai University, Tianjin, China.

Nature Nanotechnology
|April 2, 2026

View abstract on PubMed

Summary
This summary is machine-generated.

Researchers achieved coherent helicity switching in magnetic vortices using laser pulses. This breakthrough in spintronics offers precise control over spin states for advanced computing applications.

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Area of Science:

  • Spintronics
  • Condensed Matter Physics
  • Materials Science

Background:

  • Conventional magnetization switching is key for spintronics, but controlling topological spin configurations like magnetic vortices is difficult.
  • Maintaining the topology during spin precession is crucial for applications in multistate memory and neuromorphic computing.

Purpose of the Study:

  • To experimentally demonstrate coherent helicity toggle switching in nanoscale magnetic vortices.
  • To investigate the mechanism behind this switching and explore methods for controlling it.

Main Methods:

  • Utilizing femtosecond laser pulse excitation under an out-of-plane magnetic field.
  • Observing switching dynamics on picosecond timescales.
  • Employing micromagnetic simulations for validation and parameter optimization.

Main Results:

  • Achieved coherent helicity switching in magnetic vortices within hundreds of picoseconds.
  • Identified ultrafast photothermal demagnetization and coherent spin precession as the governing mechanism.
  • Demonstrated precise tunability of switching dynamics (deterministic to stochastic) via laser fluence and magnetic field.

Conclusions:

  • The study presents a viable method for coherent helicity switching in magnetic vortices, preserving their topology.
  • This technique allows for fine-tuned control over spin states, paving the way for advanced spintronic devices.
  • The findings are reproducible and validated through micromagnetic simulations.