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Enhancement in spin-torque efficiency by nonuniform spin current generated within a tapered nanopillar spin valve
P. M. Braganca, O. Ozatay, A. G. F. Garcia +3
We examine the effect a spatially non-uniform spin current with a component polarized partially out of the plane has on a low saturation magnetization nanomagnet free layer. Microm…
Time-Domain Studies of Very-Large-Angle Magnetization Dynamics Excited by Spin Transfer Torques
I. N. Krivorotov, N. C. Emley, R. A. Buhrman +1
We describe time-domain measurements which provide new information about the large-angle nonlinear dynamics of nanomagnets excited by spin-transfer torque from a spin-polarized cur…
Measurement of the Spin-Transfer-Torque Vector in Magnetic Tunnel Junctions
J. C. Sankey, Y. -T. Cui, R. A. Buhrman +3
Spin-polarized currents can transfer spin angular momentum to a ferromagnet, generating a torque that can efficiently reorient its magnetization. Achieving quantitative measurement…
Spin-Torque Ferromagnetic Resonance Measurements of Damping in Nanomagnets
G. D. Fuchs, J. C. Sankey, V. S. Pribiag +8
We measure the magnetic damping parameter a in thin film CoFeB and permalloy (Py) nanomagnets at room temperature using ferromagnetic resonance driven by microwave frequency spin-t…
Large-amplitude coherent spin waves exited by spin-polarized current in nanoscale spin valves
I. N. Krivorotov, D. V. Berkov, N. L. Gorn +4
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 measu…
Magnetic vortex oscillator driven by dc spin-polarized current
V. S. Pribiag, I. N. Krivorotov, G. D. Fuchs +5
Transfer of angular momentum from a spin-polarized current to a ferromagnet provides an efficient means to control the dynamics of nanomagnets. A peculiar consequence of this spin-…