Tracing the thermal mechanism in femtosecond spin dynamics

U. Atxitia; O. Chubykalo-Fesenko; J. Walowski; A. Mann; M. Munzenberg

Tracing the thermal mechanism in femtosecond spin dynamics

Materials Science 2009-04-29 v1 Statistical Mechanics

Authors: U. Atxitia , O. Chubykalo-Fesenko , J. Walowski , A. Mann , M. Munzenberg

Abstract

We compare femtosecond pump-probe experiments in Ni and micromagnetic modelling based on the Landau-Lifshitz-Bloch equation coupled to a two-temperature model, revealing a predominant thermal ultrafast demagnetization mechanism. We show that both spin (femtosecond demagnetization) and electron-phonon (magnetization recovery) rates in Ni increase as a function of the laser pump fluence. The slowing down for high fluences arises from the increased longitudinal relaxation time.

Keywords

femtosecond spin dynamics ultrafast demagnetization Landau-Lifshitz-Bloch equation two-temperature model pump-probe experiment nickel laser fluence

Cite

@article{arxiv.0904.4399,
  title  = {Tracing the thermal mechanism in femtosecond spin dynamics},
  author = {U. Atxitia and O. Chubykalo-Fesenko and J. Walowski and A. Mann and M. Munzenberg},
  journal= {arXiv preprint arXiv:0904.4399},
  year   = {2009}
}

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