title: Dynamic exchange coupling in magnetic bilayers.
abstract: 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.
authors.affiliation: Department of Physics, Simon Fraser University, Burnaby, British Columbia, V5A 1S6, Canada.
authors.forename: Bret
authors.initials: B
authors.lastname: Heinrich
authors.forename: Yaroslav
authors.initials: Y
authors.lastname: Tserkovnyak
authors.forename: Georg
authors.initials: G
authors.lastname: Woltersdorf
authors.forename: Arne
authors.initials: A
authors.lastname: Brataas
authors.forename: Radovan
authors.initials: R
authors.lastname: Urban
authors.forename: Gerrit E W
authors.initials: GE
authors.lastname: Bauer