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Functional spintronic devices rely on spin-charge interconversion effects,such as the reciprocal processes of electric field-driven spin torque andmagnetization dynamics-driven spin and charge flow. Both damping-like andfield-like spin-orbit torques have been observed in the forward process ofcurrent-driven spin torque and damping-like inverse spin-orbit torque has beenwell-studied via spin pumping into heavy metal layers. Here we demonstrate thatestablished microwave transmission spectroscopy of ferromagnet/normal metalbilayers under ferromagnetic resonance can be used to inductively detect the ACcharge currents driven by the inverse spin-charge conversion processes. Thistechnique relies on vector network analyzer ferromagnetic resonance (VNA-FMR)measurements. We show that in addition to the commonly-extracted spectroscopicinformation, VNA-FMR measurements can be used to quantify the magnitude andphase of all AC charge currents in the sample, including those due to spinpumping and spin-charge conversion. Our findings reveal thatNi$_{80}$Fe$_{20}$/Pt bilayers exhibit both damping-like and field-like inversespin-orbit torques. While the magnitudes of both the damping-like andfield-like inverse spin-orbit torque are of comparable scale to prior reportedvalues for similar material systems, we observed a significant dependence ofthe damping-like magnitude on the order of deposition. This suggests interfacequality plays an important role in the overall strength of the damping-likespin-to-charge conversion.

Inductive detection of field-like and damping-like AC inverse spin-orbit torques in ferromagnet/normal metal bilayers