We investigated the composition effect on spin Seebeck coefficient in YIG/Pt100-X Ru X , YIG/Pt100-X Cu X , and YIG/Pt100-X (Cu0.5Ru0.5) X systems. In all systems the composition of around 50 (at%) showed the maximum spin Seebeck coefficient, which is considered as the result from the extrinsic spin Hall effect improvement since the resistivity was also increased with doping Ru and Cu into Pt host. In terms of the spin Seebeck coefficient dependence on doped element, YIG/Pt100-X Cu X was the largest, followed in order by YIG/Pt100-X (Cu0.5Ru0.5) X , and YIG/Pt100-X Ru X , although both of Cu and Ru have equally small spin Hall angle in the single state. The X-ray diffraction analysis showed that Cu doping most widely decreased the unit cell size of alloy, and consequently increased the resistivity. It is considered as a reason of improvement of the extrinsic spin Hall angle and the spin Seebeck voltage.
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