4.8 Article

Superdiffusive Spin Transport as a Mechanism of Ultrafast Demagnetization

Journal

PHYSICAL REVIEW LETTERS
Volume 105, Issue 2, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.027203

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Funding

  1. Swedish Research Council [FP7 EU-ITN FANTOMAS]
  2. G. Gustafsson Foundation
  3. Swedish National Infrastructure for Computing (SNIC)

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We propose a semiclassical model for femtosecond laser-induced demagnetization due to spin-polarized excited electron diffusion in the superdiffusive regime. Our approach treats the finite elapsed time and transport in space between multiple electronic collisions exactly, as well as the presence of several metal films in the sample. Solving the derived transport equation numerically we show that this mechanism accounts for the experimentally observed demagnetization within 200 fs in Ni, without the need to invoke any angular momentum dissipation channel.

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