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Using a multilayer structure containing (cobalt detector layer)/(copperspacer)/(Permalloy source layer), we show experimentally how thenon-reorientable spin-orbit torque generated by the Permalloy source layer (thecomponent of spin-orbit torque that does not change when the Permalloymagnetization is rotated) can be measured using spin-torque ferromagneticresonance (ST-FMR) with lineshape analysis. We find that dynamic spin pumpingbetween the magnetic layers exerts torques on the magnetic layers as large orlarger than the spin-orbit torques, so that if dynamic spin pumping isneglected the result would be a large overestimate of the spin-orbit torque.Nevertheless, the two effects can be separated by performing ST-FMR as afunction of frequency. We measure a non-reorientable spin torque ratio$\xi_{\text{Py}} = 0.04 \pm 0.01$ for spin current flow from Permalloy throughan 8 nm Cu spacer to the Co, and a strength of dynamic spin pumping that isconsistent with previous measurements by conventional ferromagnetic resonance.

Resonant Measurement of Non-Reorientable Spin-Orbit Torque from a Ferromagnetic Source Layer Accounting for Dynamic Spin Pumping