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      Enhanced Gilbert Damping in Thin Ferromagnetic Films

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          Abstract

          Using a scattering matrix approach, 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 factor in the Landau-Lifshitz equation. The damping is expressed in terms of the scattering matrix of the ferromagnet-normal metal interface, 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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          Most cited references 29

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          Current-driven excitation of magnetic multilayers

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            Emission of spin waves by a magnetic multilayer traversed by a current

             L. Berger (1996)
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              Measuring the spin polarization of a metal with a superconducting point contact

              A superconducting point contact is used to determine the spin polarization at the Fermi energy of several metals. Because the process of supercurrent conversion at a superconductor-metal interface (Andreev reflection) is limited by the minority spin population near the Fermi surface, the differential conductance of the point contact can reveal the spin polarization of the metal. This technique has been applied to a variety of metals where the spin polarization ranges from 35 to 90 percent: Ni0.8Fe0.2, Ni, Co, Fe, NiMnSb, La0.7Sr0.3MnO3, and CrO2.
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                Author and article information

                Journal
                11 October 2001
                2002-08-14
                Article
                10.1103/PhysRevLett.88.117601
                cond-mat/0110247
                Custom metadata
                Phys. Rev. Lett. 88 (2002) 117601
                1 figure
                cond-mat.mes-hall

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