  We study the temperature dependence of the spin Hall magnetoresistance (SMR)
in yttrium iron garnet/platinum hybrid structures via magnetization orientation
dependent magnetoresistance measurements. Our experiments show a decrease of
the SMR magnitude with decreasing temperature. Using the sensitivity of the SMR
to the spin transport properties of the normal metal, we interpret our data in
terms of a decrease of the spin Hall angle in platinum from 0.11 at room
temperature to 0.075 at 10K, while the spin diffusion length and the spin
mixing conductance of the ferrimagnetic insulator/normal metal interface remain
almost constant.
