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We perform 3D micromagnetic simulations of current-driven magnetizationdynamics in nanoscale exchange biased spin-valves that take account of (i) backaction of spin-transfer torque on the pinned layer, (ii) non-linear damping and(iii) random thermal torques. Our simulations demonstrate that all thesefactors significantly impact the current-driven dynamics and lead to a betteragreement between theoretical predictions and experimental results. Inparticular, we observe that, at a non-zero temperature and a sub-criticalcurrent, the magnetization dynamics exhibits nonstationary behaviour in whichtwo independent persistent oscillatory modes are excited which compete for theangular momentum supplied by spin-polarized current. Our results show that thismulti-mode behaviour can be induced by combined action of thermal and spintransfer torques.

Micromagnetic simulations of persistent oscillatory modes excited by spin-polarized current in nanoscale exchange-biased spin valves