Spin pumping at the Co₂FeAl_0.5Si_0.5/Pt interface

Spin pumping at the Co₂FeAl_0.5Si_0.5/Pt and Pt/Co₂FeAl_0.5Si_0.5 interfaces has been studied by ferromagnetic resonance technology (FMR). The spin mixing conductance of the Co₂FeAl_0.5Si_0.5/Pt and Pt/Co₂FeAl_0.5Si_0.5 interfaces was determined to be 3.7×10¹⁹ m^-2 and 2.1×10¹⁹ m^-2 by comparing the Gilbert damping in a Co₂FeAl_0.5Si_0.5 single film, Co₂FeAl_0.5Si_0.5/Pt bilayer film and a Pt/Co₂FeAl_0.5Si_0.5/Pt trilayer film. Spin pumping is more efficient in the Co₂FeAl_0.5Si_0.5/Pt bilayer film than in permalloy/Pt bilayer film.