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The time-resolved magnetic response of ultrathin epitaxial Fe(001)   films grown on GaAs(001) and covered by Au, Pd, and Cr capping layers  was investigated by time and spatially resolved Kerr effect measurements. The magnetization was excited by an in-plane magnetic  field pulse using the transient internal field generated at a Schottky  barrier while the wavelength of the excitation (resonant mode) was  roughly 4 mu m. Each of the three cap layers affected the spin  relaxation in a unique way. Au cap layers resulted in the bulk Gilbert  damping of the Fe film. Pd cap layers caused an additional Gilbert damping due to spin-pump or spin-sink effects. Cr cap layers lead to a  strong extrinsic damping which can be described by two-magnon  scattering. In this case the strength of the extrinsic damping can be  controlled by a field induced shift of the spin wave manifold with respect to the excited k vector

Time Resolved Magnetization Dynamics of Ultrathin Fe(001) Films: Spin-Pumping and Two-Magnon Scattering