Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2001-10-11
Phys. Rev. Lett. 88 (2002) 117601
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
1 figure
Scientific paper
10.1103/PhysRevLett.88.117601
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.
Bauer Gerrit E. W.
Brataas Arne
Tserkovnyak Yaroslav
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