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Ultrafast spin dynamics: the effect of colored noise.

U Atxitia1, O Chubykalo-Fesenko, R W Chantrell

  • 1Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco, 28049 Madrid, Spain.

Physical Review Letters
|March 5, 2009
PubMed
Summary

A new Landau-Lifshitz-Miyasaki-Seki approach describes ultrafast magnetization dynamics under extreme conditions. This model reveals how noise correlation time impacts the speed of demagnetization, crucial for understanding magnetic materials.

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Area of Science:

  • Condensed matter physics
  • Ultrafast phenomena
  • Magnetization dynamics

Background:

  • Recent experiments probe magnetization dynamics on pico- and femtosecond timescales.
  • Ultrafast dynamics occur under extreme conditions: strong fields, rapid changes, and high temperatures.
  • Electron correlation times can approach the inverse spin frequency, necessitating new theoretical models.

Purpose of the Study:

  • Introduce a thermodynamically consistent phenomenological model for ultrafast magnetization dynamics.
  • Investigate the influence of electron correlation time on magnetization dynamics.
  • Analyze the effect of noise correlation time on ultrafast demagnetization rates.

Main Methods:

  • Development of a thermodynamically correct phenomenological Landau-Lifshitz-Miyasaki-Seki approach.
  • Theoretical modeling of magnetization dynamics under extreme conditions.
  • Simulation and analysis of ultrafast demagnetization processes.

Main Results:

  • The proposed Landau-Lifshitz-Miyasaki-Seki approach accurately describes magnetization dynamics at ultrafast scales.
  • Demonstrated the significant effect of noise correlation time on the ultrafast demagnetization rate.
  • Established a framework for understanding magnetization dynamics when electron correlation times are comparable to spin frequencies.

Conclusions:

  • The new phenomenological approach is essential for describing ultrafast magnetization dynamics.
  • Noise correlation time is a critical parameter influencing demagnetization rates in extreme conditions.
  • This work provides a foundation for future research in ultrafast magnetism and spintronics.