Dynamic exchange coupling in magnetic bilayers
Bret Heinrich, Yaroslav Tserkovnyak, Georg Woltersdorf, Arne Brataas,, Radovan Urban, and Gerrit E. W. Bauer
TL;DR
This paper reports on a long-range dynamic interaction between ferromagnetic films separated by normal-metal spacers, mediated by nonequilibrium spin currents, with effects observed via ferromagnetic resonance and explained by spin-pump theory.
Contribution
It introduces a novel understanding of dynamic exchange coupling in magnetic bilayers through experimental FMR measurements and theoretical spin-pump explanation.
Findings
Increased FMR line width when resonance fields are apart
Line-width narrowing as FMR fields approach
Long-range interaction mediated by spin currents
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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