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The effect of thermal fluctuations on spin-transfer switching has beenstudied for a broad range of time scales (sub-ns to seconds) in a model system,a uniaxial thin film nanomagnet. The nanomagnet is incorporated into aspin-valve nanopillar, which is subject to spin-polarized current pulses ofvariable amplitude and duration. Two physical regimes are clearlydistinguished: a long pulse duration regime, in which reversal occurs byspin-transfer assisted thermal activation over an energy barrier, and a shorttime large pulse amplitude regime, in which the switching probability isdetermined by the spin angular momentum in the current pulse.

Spin-transfer pulse switching: From the dynamic to the thermally activated regime