Gilbert Damping in Magnetic Multilayers

Details Gilbert Damping in Magnetic Multilayers Gilbert Damping in Magnetic Multilayers

2002-07-19

arxiv.org/abs/cond-mat/0207471v1

Physics

Condensed Matter

Materials Science

1 figure, 5pages

Scientific paper

10.1103/PhysRevB.67.144418

We study the enhancement of the ferromagnetic relaxation rate in thin films due to the adjacent normal metal layers. Using linear response theory, we derive the dissipative torque produced by the s-d exchange interaction at the ferromagnet-normal metal interface. For a slow precession, the enhancement of Gilbert damping constant is proportional to the square of the s-d exchange constant times the zero-frequency limit of the frequency derivative of the local dynamic spin susceptibility of the normal metal at the interface. Electron-electron interactions increase the relaxation rate by the Stoner factor squared. We attribute the large anisotropic enhancements of the relaxation rate observed recently in multilayers containing palladium to this mechanism. For free electrons, the present theory compares favorably with recent spin-pumping result of Tserkovnyak et al. [Phys. Rev. Lett. \textbf{88},117601 (2002)].

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