Electrical determination of spin mixing conductance at metal/insulator interface using inverse spin Hall effect

The spin mixing conductance at Au/BiY2Fe5O12 and Pt/BiY2Fe5O12 interfaces was electrically determined using the inverse spin Hall effect (ISHE) and the spin pumping. By measuring the electromotive force due to the ISHE and the ferromagnetic resonance spectra, we evaluated the magnitude of the generated spin currents and the magnetization-precession trajectory. The spin mixing conductance was estimated as 1.82 x 10(18) m(-2) for the Pt/BiY2Fe5O12 film, and as 2.21 x 10(18) m(-2) for the Au/BiY2Fe5O12 film, demonstrating efficient spin exchange at these metal/insulator interfaces. (C) 2012 American Institute of Physics. [doi:10.1063/1.3673429]