Fig. 2.

Separation of spin current and interlayer coupling contributions to the torque driving the Fe₇₅Co₂₅ spin precession. a Schematic drawing of ac spin current and interlayer coupling as the driving mechanisms of Fe₇₅Co₂₅ spin precession originating from the Py FMR. b, d Field dependence of the amplitude and c, e field dependence of the phase of Py and Fe₇₅Co₂₅ spin precession at 280 K from b, c Py/Ag/CoO/Ag(2 nm)/Fe₇₅Co₂₅ and d, e Py/Ag/CoO/Ag(10 nm)/Fe₇₅Co₂₅, respectively. Red and blue lines are fits to the Py and Fe₇₅Co₂₅ signals, respectively. The error bars denote the standard errors of the means determined from the fittings of FM spin procession. f Temperature dependence of the spin current (β_sc) and interlayer coupling (β_int) coefficients for the two samples. The error bars denote the standard errors of the means determined from the fittings of field-dependent FM spin processions based on Eq. (1) and Eq. (2)