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We study spin pumping in a$\mathrm{Y_3Fe_5O_{12}(YIG)/Pt/Ni_{81}Fe_{19}(Py)}$ trilayer film by means ofthe inverse spin Hall effect (ISHE). When the ferromagnets are not excitedsimultaneously by a microwave, ISHE-induced voltage is of the opposite sign ateach ferromagnetic resonance (FMR). The opposite sign is consistent with spinpumping of bilayer films. On the other hand, the voltage is of the same sign ateach FMR when both the ferromagnets are excited simultaneously. Futhermore, thevoltage greatly increases in magnitude. The observed voltage is unconventional;neither its sign nor magnitude can be expected from spin pumping of bilayerfilms. Control experiments show that the unconventional voltage is dominantlyinduced by spin pumping at the Py/Pt interface. Interaction between YIG and Pylayers is a possible origin of the unconventional voltage.

Enhancement of Spin Pumping in $\mathrm{Y_3Fe_5O_{12}/Pt/Ni_{81}Fe_{19}}$ Trilayer Film