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It is demonstrated that the threshold current for damping compensation can be reached in a 5 diameter YIG (20 nm) |Pt (7 nm) disk. The demonstration rests upon the measurement of the ferromagnetic resonance linewidth as a function of I₃₂ using a magnetic resonance force microscope (MRFM). It is shown that the magnetic losses of spin-wave modes existing in the magnetic insulator can be reduced or enhanced by at least a factor of 5 depending on the polarity and intensity of an in-plane dc current I₃₂ flowing through the adjacent normal metal with strong spin-orbit interaction. Complete compensation of the damping of the fundamental mode by spin-orbit torque is reached for a current density of 310^11 Am^-2, in agreement with theoretical predictions. At this critical threshold the MRFM detects a small change of static magnetization, a behavior consistent with the onset of an auto-oscillation regime.
Hamadeh et al. (Fri,) studied this question.