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We report the experimental observation of collective picosecond magnetizationdynamics in [Co/Pd]8 multilayers with perpendicular magnetic anisotropy. Theprecession frequency shows large and systematic variation from about 5 GHz toabout 90 GHz with the decrease in the Co layer thickness from 1.0 nm to 0.22 nmdue to the linear increase in the perpendicular magnetic anisotropy. Thedamping coefficient 'alpha' is found to be inversely proportional to the Colayer thickness and a linear relation between the perpendicular magneticanisotropy and 'alpha' is established. We discuss the possible reasons behindthe enhanced damping as the d-d hybridization at the interface and spinpumping. These observations are significant for the applications of thesematerials in spintronics and magnonic crystals.

Tunable Magnonic Frequency and Damping in [Co/Pd]8 Multilayers with Variable Co Layer Thickness