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Single-Shot Magnetization Reversal in Ferromagnetic Spin Valves via Heat Control.

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Area of Science:

  • Physics
  • Materials Science
  • Nanotechnology

Background:

  • Ultrafast magnetization dynamics are crucial for next-generation data storage.
  • Understanding energy transfer mechanisms in magnetic materials is essential.

Purpose of the Study:

  • To investigate laser-induced ultrafast magnetization reversal in ferromagnetic spin valves.
  • To compare direct laser excitation with ultrashort hot-electron pulse excitation.
  • To elucidate the role of electronic temperature and nonlocal transport.

Main Methods:

  • Fabrication of a spin valve with a wedged copper (Cu) layer for tunable energy transmission.
  • Excitation using picosecond laser pulses and ultrashort hot-electron pulses.
  • Systematic investigation of laser fluence, Cu thickness, and pulse duration effects.

Main Results:

  • Demonstrated single-shot magnetization reversal of the free layer using hot-electron pulses.
  • Achieved magnetization reversal with picosecond laser pulses.
  • Identified full demagnetization via rapid electronic temperature rise as the critical factor.

Conclusions:

  • Magnetization reversal is driven by a rapid increase in the free layer's electronic temperature.
  • Both direct laser and hot-electron excitation can induce reversal under out-of-equilibrium conditions.
  • This study advances the understanding of nonlocal heat and spin transport in ultrafast magnetism.