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We show that a slowly decaying current pulse can lead to nearly deterministicprecessional switching in the presence of noise. We consider a biaxialmacrospin, with an easy axis in the plane and a hard axis out-of-the plane,typical of thin film nanomagnets patterned into asymmetric shapes. Out-of-planeprecessional magnetization orbits are excited with a current pulse with acomponent of spin polarization normal to the film plane. By numericallyintegrating the stochastic Landau-Lifshitz-Gilbert-Slonczewski equation we showthat thermal noise leads to strong dephasing of the magnetization orbits.However, an adiabatically decreasing pulse amplitude overwhelmingly leads tomagnetization reversal, with a final state that {\em only} depends on the pulsepolarity, not on the pulse amplitude. We develop an analytic model to explainthis phenomena and to determine the pulse decay time necessary for adiabaticmagnetization relaxation and thus precessional magnetization switching.

Reliable spin-transfer torque driven precessional magnetization reversal with an adiabatically decaying pulse