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We describe time-domain measurements which provide new information about thelarge-angle nonlinear dynamics of nanomagnets excited by spin-transfer torquefrom a spin-polarized current. Sampling-oscilloscope measurements, whichaverage over thousands of experimental time traces, show that the mean reversaltime for spin-transfer-driven magnetic switching has a step-like dependence onmagnetic field, because an integer number of precession cycles is required forreversal. Storage-oscilloscope measurements of individual experimental tracesreveal non-periodic large-amplitude resistance variations at values of magneticfield and current in a crossover region between the regimes ofspin-transfer-driven switching and steady-state precession. We also observedirectly the existence of time-dependent switching, on the nanosecond scale,between different precessional modes and between a precessional mode and astatic state, at particular values of magnetic field and current bias.

Time-Domain Studies of Very-Large-Angle Magnetization Dynamics Excited by Spin Transfer Torques