Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-03-17
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
24 pages, 4 figures, submitted to Physical Review B; in the 1st revised version some references were corrected
Scientific paper
10.1103/PhysRevB.76.024418
We present spectral measurements of spin-wave excitations driven by direct spinpolarized current in the free layer of nanoscale Ir20Mn80/Ni80Fe20/Cu/Ni80Fe20 spin valves. The measurements reveal that large-amplitude coherent spin wave modes are excited over a wide range of bias current. The frequency of these excitations exhibits a series of jumps as a function of current due to transitions between different localized nonlinear spin wave modes of the Ni80Fe20 nanomagnet. We find that micromagnetic simulations employing the Landau-Lifshitz-Gilbert equation of motion augmented by the Slonczewski spin torque term (LLGS) accurately describe the frequency of the current-driven excitations including the mode transition behavior. However LLGS simulations give qualitatively incorrect predictions for the amplitude of excited spin waves as a function of current.
Berkov Dmitri V.
Buhrman Robert A.
Emley N. C.
Gorn Natalia L.
Krivorotov Ilya N.
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