Enhanced Gilbert Damping in Thin Ferromagnetic Films

Yaroslav Tserkovnyak, Arne Brataas, and Gerrit E. W. Bauer
Phys. Rev. Lett. 88, 117601 – Published 28 February 2002
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Abstract

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.

  • Received 11 October 2001

DOI:https://doi.org/10.1103/PhysRevLett.88.117601

©2002 American Physical Society

Authors & Affiliations

Yaroslav Tserkovnyak and Arne Brataas

  • Lyman Laboratory of Physics, Harvard University, Cambridge, Massachusetts 02138

Gerrit E. W. Bauer

  • Department of Applied Physics and DIMES, Delft University of Technology, 2628 CJ Delft, The Netherlands

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Vol. 88, Iss. 11 — 18 March 2002

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