  The spin Hall angle in Pt is evaluated in Pt/NiFe bilayers by spin torque
ferromagnetic resonance (ST-FMR) measurements, and is found to increase with
increasing the NiFe thickness. To extract the intrinsic spin Hall angle in Pt
by estimating the total spin current injected into NiFe from Pt, the NiFe
thickness dependent measurements are performed and the spin diffusion in the
NiFe layer is taken into account. The intrinsic spin Hall angle of Pt is
determined to be 0.068 at room temperature, and is found to be almost constant
in the temperature range 13 - 300 K.
