We present theoretical studies of the spin pumping contribution to the ferromagnetic resonance linewidth for various ultrathin film ferromagnetic structures. We consider the isolated film on a substrate, with Fe on Au͑100͒ and Fe on W͑110͒ as examples. We explore as well the linewidth from this mechanism for the optical and acoustical collective modes of FM/ Cu N /FM/Cu͑100͒ structures. The calculations employ a realistic electronic structure, with self-consistent ground states generated from the empirical ti…
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