Nonlinear Waves Seminar: Ezio Iacocca
Current-induced waves in thin film ferromagnets
CU Applied Mathematics andÌý
Date and time:Ìý
Tuesday, November 3, 2015 - 4:00pm
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ECOT 226
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Ferromagnets are intrinsically dynamic materials that exhibit the unusual characteristic of a tangible force originated from quantum effects. Thanks to the development of fabrication and patterning techniques at the nanoscale, fundamentally new physical effects have been uncovered. One of the most exciting is the discovery of the spin transfer torque (STT) effect in 1996, which indicates that a current can induce magnetic dynamics. In this talk, I will motivate the study of ferromagnets from the perspective of nonlinear waves based on my previous research experience in the field. I will give a brief survey of magnetism, discuss the physical origin and mathematical representation of current-driven dynamics in ferromagnets, and show some of the experimental and analytical results studied to date. It will become clear that the vast literature on experimental results cannot be explained by the small-amplitude theories available so far and a different perspective needs to be introduced.