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We present spectral measurements of spin-wave excitations driven by directspinpolarized current in the free layer of nanoscaleIr20Mn80/Ni80Fe20/Cu/Ni80Fe20 spin valves. The measurements reveal thatlarge-amplitude coherent spin wave modes are excited over a wide range of biascurrent. The frequency of these excitations exhibits a series of jumps as afunction of current due to transitions between different localized nonlinearspin wave modes of the Ni80Fe20 nanomagnet. We find that micromagneticsimulations employing the Landau-Lifshitz-Gilbert equation of motion augmentedby the Slonczewski spin torque term (LLGS) accurately describe the frequency ofthe current-driven excitations including the mode transition behavior. HoweverLLGS simulations give qualitatively incorrect predictions for the amplitude ofexcited spin waves as a function of current.Comment: 24 pages, 4 figures, submitted to Physical Review B; in the 1st  revised version some references were correcte

Large-amplitude coherent spin waves excited by spin-polarized current in nanoscale spin valves