Fig. 1: ST-FMR analysis.
From: Absence of orbital current torque in Ta/ferromagnet bilayers
a Schematic of potential torque generation in Ta/ferromagnet bilayer by the spin Hall effect and orbital Hall effect of Ta. b Optical microscopy image and measurement geometry of a ST-FMR device. c Typical ST-FMR spectra for Ta 5/Ni 4, Ta 5/Ni81Fe19 3.8, Ta 5/Fe 3.3, Ta 5/Fe60Co20B20 3, and Ta 5/Fe50Pt50 3 (φ = 45o), with the three solid curves plotting the best fit of the data to Eq. (1) (in orange), the symmetric (in red), and antisymmetric (in blue) components. d Inverse thickness dependence of 1/ξFMR for the Ta/Ni, Ta/Ni81Fe19, Ta/Fe, Ta/Fe60Co20B20, and Ta/Fe50Pt50 samples. Solid lines in (d) represent linear fits. The rf power is 8 dBm.
