Friday, October 22, 2010

TODAY - Physics Colloquium- Fri., Oct. 22, MAP 318, 4:20 P.M.

Dr. Ilya Krivorotov

University of California - Irvine

Spin Transfer and Nonlinear Magnetization Dynamics in Ferromagnetic Nanostructures

Spin transfer torque from a spin-polarized current applied to a metallic ferromagnet can excite magnetization oscillations of very large amplitude. We use this unique property of spin current to study new types of magnetization dynamics in the strongly nonlinear regime.

I will describe our recent measurements of spin-current-driven dynamics in nanoscale ferromagnetic dots and ferromagnetic nanowires. In these systems, we observe several unusual magneto-dynamic phenomena that include non-adiabatic stochastic resonance, rapid current-induced domain wall motion and size quantization of nonlinear magnon scattering. I will also briefly discuss emerging technologies such as universal magnetic memory and microwave nanooscillators that utilize interactions between spin currents and magnetization in nanoscale magnetic tunnel junctions.

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