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Phys Rev Lett. 2002 Mar 18;88(11):117601. Epub 2002 Feb 28.

Enhanced gilbert damping in thin ferromagnetic films.

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Lyman Laboratory of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.


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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