Abstract
We report on the measurements of current-driven dynamics in magnetic nanopillars as a function of the current-sweep rate. These measurements were intended to verify the recently predicted thermal-activation nature of current-induced precessional states in spin-valve multilayers. For a fixed temperature and field (applied perpendicular to the layers), the critical current for dynamic excitations was found to increase logarithmically with the sweep rate as expected for a thermally activated process. However, we observed little if any dependence of this behavior on temperature. We discuss the implications of this in terms of a simple model of spin-torque driven magnetization dynamics.
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