▎ 摘　　要

We demonstrate that spin pumping in a Ni81Fe19/Pt bilayer is strongly suppressed by inserting single-layer graphene (SLG) at the interface. Spin pumping in the Ni81Fe19/Pt bilayer enhances the magnetization damping of the ferromagnetic layer, which is quantified from the microwave frequency dependence of the ferromagnetic resonance linewidth. We show that the enhancement of the magnetization damping due to spin pumping disappears in a Ni81Fe19/SLG/Pt trilayer. This result indicates that spin pumping is blocked by the atomic monolayer, illustrating the crucial role of interfacial short-range spin-exchange coupling in spin pumping in metallic systems. (C) 2015 The Japan Society of Applied Physics