Enhanced gilbert damping in thin ferromagnetic films.

@article{Tserkovnyak2002EnhancedGD,
  title={Enhanced gilbert damping in thin ferromagnetic films.},
  author={Yaroslav Tserkovnyak and Arne Brataas and Gerrit E. W. Bauer},
  journal={Physical review letters},
  year={2002},
  volume={88 11},
  pages={
          117601
        }
}
The precession of the magnetization of a ferromagnet is shown to transfer spins into adjacent normal metal layers. This "pumping" of spins slows down the precession corresponding to an enhanced Gilbert damping constant in the Landau-Lifshitz equation. The damping is expressed in terms of the scattering matrix of the ferromagnetic layer, which is accessible to model and first-principles calculations. Our estimates for permalloy thin films explain the trends observed in recent experiments. 

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