Spin Pumping in Polycrystalline Magnetic Insulator/Metal Pt Films

In this paper, we demonstrate the spin pumping, spin current generation from magnetization dynamics, at an interface between metal Pt and polycrystalline magnetic insulator Bi_xY_3-xFe₅O₁₂ (x=0 and 1) prepared by the metal-organic decomposition method. We measured the electromotive force due to the inverse spin-Hall effect induced by the spin pumping in a polycrystalline Y₃Fe₅O₁₂/Pt and a polycrystalline BiY₂Fe₅O₁₂/Pt films. We found that spin mixing conductance estimated from the magnitude of the electromotive force for the BiY₂Fe₅O₁₂/Pt is much greater than that for the Y₃Fe₅O₁₂/Pt.