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Ultrashort infrared laser pulses can trigger complex spin texture changes in magnetic materials without external fields. This research reveals transient surface spin reversals, important for developing novel magnetic data storage technologies.

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Area of Science:

  • Magnetism and Spintronics
  • Ultrafast Laser Physics
  • Materials Science

Background:

  • Laser-induced magnetization dynamics are crucial for advanced magnetic applications.
  • Controlling spin textures without external fields is a significant challenge.
  • Magnetic vortices exhibit complex spin textures sensitive to external stimuli.

Purpose of the Study:

  • To investigate the use of ultrashort infrared laser pulses for triggering transient spin texture changes in magnetic vortices.
  • To probe laser-induced dynamics using time-resolved magnetic helicoidal dichroism (MHD) and micromagnetic simulations.
  • To provide direct evidence of transient spin texture reorganizations and surface spin reversals.

Main Methods:

  • Excitation of magnetic vortex dynamics using ultrashort infrared laser pulses.
  • Time-resolved magnetic helicoidal dichroism (MHD) in resonant extreme ultraviolet scattering for probing.
  • Micromagnetic simulations to support experimental observations and analyze spin textures.

Main Results:

  • Laser pulses induce ultrafast demagnetization and remagnetization processes.
  • Analysis of MHD signals reveals significant transient spin texture reorganizations.
  • Evidence of a transient surface magnetic texture with reversed curling direction compared to the bulk.

Conclusions:

  • Optical methods can prepare metastable complex spin states in magnetic films without external fields.
  • Laser-induced surface spin reversals offer new pathways for magnetic data storage and manipulation.
  • Understanding transient spin dynamics is key to advancing spintronic device functionalities.