非对称自旋阀中热辅助电流驱动的双稳态旋进区
Thermally Assisted Current-Driven Bistable Precessional Regimes in Asymmetric Spin Valves
摘要：
非对称自旋阀中的自旋转移力矩可以使平行和反平行配置不稳定，并且在没有外部磁场的情况下也可以导致进动模式。我们发现在这样的系统中的一个双稳态旋进制度，并表明，热波动可以激发相应的振荡制度，以及分离的不可逆路径在低温下之间的过渡（电报噪声）。由于热致跃迁，所产生的电流驱动振荡的频率与在非常低的温度下获得的频率不同。我们还表明，双稳态区的功率谱由面外振荡模式主导。
英文摘要：
Spin-transfer torque in asymmetric spin valves can destabilize both parallel and antiparallel configurations and can lead to precessional modes also in the absence of an external magnetic field. We find a bistable precessional regime in such systems and show that thermal fluctuations can excite transitions (telegraph noise) between the corresponding oscillatory regimes that are well separated by irreversible paths at low temperatures. Because of the thermally induced transitions, the frequency of the resulting current-driven oscillations is different from that obtained at very low temperatures. We also show that the power spectrum in the bistable region is dominated by the out-of-plane oscillatory mode.
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