Enhanced gilbert damping in thin ferromagnetic films.
@article{Tserkovnyak2002EnhancedGD,
title={Enhanced gilbert damping in thin ferromagnetic films.},
author={Y. Tserkovnyak and A. Brataas and G. 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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