The authors have investigated the contribution of the surface spin waves to
spin pumping. A Pt/NiFe bilayer has been used for measuring spin waves and spin
pumping signals simultaneously. The theoretical framework of spin pumping
resulting from ferromagnetic resonance has been extended to incorporate spin
pumping due to spin waves. Equations for the effective area of spin pumping due
to spin waves have been derived. The amplitude of the spin pumping signal
resulting from travelling waves is shown to decrease more rapidly with
precession frequency than that resulting from standing waves and show good
agreement with the experimental data