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Spin-transfer torque in asymmetric spin valves can destabilize both paralleland antiparallel configurations and can lead to precessional modes also in theabsence of an external magnetic field. We find a bistable precessional regimein such systems and show that thermal fluctuations can excite transitions(telegraph noise) between the corresponding oscillatory regimes that are wellseparated by irreversible paths at low temperatures. Because of the thermallyinduced transitions, the frequency of the resulting current-driven oscillationsis different from that obtained at very low temperatures. We also show that thepower spectrum in the bistable region is dominated by the out-of-planeoscillatory mode.

Thermally Assisted Current-Driven Bistable Precessional Regimes in Asymmetric Spin Valves