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Dynamic exchange coupling in magnetic bilayers

Bret Heinrich·Yaroslav Tserkovnyak·Georg Woltersdorf·Arne Brataas·Radovan Urban·Gerrit E. W. Bauer
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Abstract

A long-ranged 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 (FMR) and explained by an adiabatic spin-pump theory. In FMR the spin-pump mechanism of spatially separated magnetic moments leads to an appreciable increase in the FMR line width when the resonance fields are well apart, and results in a dramatic line-width narrowing when the FMR fields approach each other.

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Bret Heinrich, Yaroslav Tserkovnyak, Georg Woltersdorf, Arne Brataas, Radovan Urban, Gerrit E. W. Bauer. 2003-05-12. Dynamic exchange coupling in magnetic bilayers. https://doi.org/10.1103/physrevlett.90.187601

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