Enhanced Gilbert damping in thin ferromagnetic films
Physical review letters, 2002•APS
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.
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.
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.
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