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The remagnetization process after ultrafast demagnetization can be describedby relaxation mechanisms between the spin, electron, and lattice reservoirs.Thereby, collective spin excitations in form of spin waves and their angularmomentum transfer play an important role on the longer timescales. In thiswork, we address the question whether the strength of demagnetization affectsthe coherency and the phase of the excited spin waves. We present a study ofcoherent magnetization dynamics in thin nickel films after ultrafastdemagnetization using the all-optical, time-resolved magneto-opticalKerr-effect (tr-MOKE) technique. The largest coherent oscillation amplitude wasobserved for strongly quenched systems, showing the conservation of coherencyfor demagnetizations of up to 90%. Moreover, the phase of the excitedspin-waves increases with pump power, indicating a delayed start of theprecession during the remagnetization.

Coherent magnetization dynamics in strongly quenched Ni thin films