Gilbert damping is reported in perpendicularly magnetized Ni/Co multilayer films with Pt buffer and capping layers, and investigated through the time-resolved magneto-optical Kerr effect under various applied magnetic field strengths and directions. Both damping constant α and perpendicular magnetic anisotropy energy K u depend strongly on layer thickness and bilayer periodicity, and rise to approximately 0.08 and 8 Merg/cm 3 , respectively. The Gilbert damping rate depends linearly on inverse multilayer thickness, indicating that large damping in the Ni/Co multilayers stems from its interfaces in contact with the Pt layers.
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Mizukami et al. (2011) studied this question.
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