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Phys Rev Lett. 2003 May 9;90(18):187601. Epub 2003 May 9.

Dynamic exchange coupling in magnetic bilayers.

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Department of Physics, Simon Fraser University, Burnaby, British Columbia, V5A 1S6, Canada.


A long-range dynamic interaction between ferromagnetic films separated by normal-metal spacers is reported, which is communicated by nonequilibrium spin currents. It is measured by ferromagnetic resonance and explained by an adiabatic spin-pump theory. In such a resonance the spin-pump mechanism of spatially separated magnetic moments leads to an appreciable increase in the resonant linewidth when the resonance fields are well apart, and results in a dramatic linewidth narrowing when the resonant fields approach each other.

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