Influence of inverse spin Hall effect in spin-torque ferromagnetic resonance measurements

This is the authors' abstract. We don't add key points for this paper.

We have performed spectral analyses of spin-torque ferromagnetic resonance (ST-FMR) signals in both Ni 80 Fe 20 /Ta and Co 40 Fe 40 B 20 /Ta bilayers and compared the spin Hall angles of these signals. We found that the contribution of the inverse spin Hall effect to the total signal in ST-FMR measurements is marked particularly in the case of Co 40 Fe 40 B 20 /Ta bilayers, because the anisotropic magnetoresistance effect in Co 40 Fe 40 B 20 , i.e., the origin of the ST-FMR signal, is much smaller than that in Ni 80 Fe 20 . When we take into account the contribution of the inverse spin Hall effect, the spin Hall angle of Co 40 Fe 40 B 20 /Ta decreases to less than half of that estimated by conventional ST-FMR spectral analysis.