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首页> 外文期刊>Physica, B. Condensed Matter >Analysis of thermally induced magnetization dynamics in spin-transfer nano-oscillators
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Analysis of thermally induced magnetization dynamics in spin-transfer nano-oscillators

机译：自旋转移纳米振荡器中的热感应磁化动力学分析

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摘要

The thermally induced magnetization dynamics in the presence of spin-polarized currents injected into a spin-valve-like structure used as microwave spin-transfer nano-oscillator (STNO) is considered. Magnetization dynamics is described by the stochastic Landau-Lifshitz-Slonczewski (LLS) equation. First, it is shown that, in the presence of thermal fluctuations, the spectrum of the output signal of the STNO exhibits multiple peaks at low and high frequencies. This circumstance is associated with the occurrence of thermally induced transitions between stationary states and magnetization self-oscillations. Then, a theoretical approach based on the separation of time-scales is developed to obtain a stochastic dynamics only in the slow state variable, namely the energy. The stationary distribution of the energy and the aforementioned transition rates are analytically computed and compared with the results of direct integration of the LLS dynamics, showing very good agreement.
机译：考虑了在自旋极化电流的存在下的热感应磁化动力学，该自旋极化电流注入用作微波自旋转移纳米振荡器（STNO）的自旋阀状结构中。磁化动力学由随机的Landau-Lifshitz-Slonczewski（LLS）方程描述。首先，显示出在存在热波动的情况下，STNO的输出信号的频谱在低频和高频处表现出多个峰值。这种情况与在稳态和磁化自激振荡之间发生热感应跃迁有关。然后，发展了一种基于时间尺度分离的理论方法，以仅在慢状态变量即能量中获得随机动力学。分析了能量的静态分布和上述跃迁速率，并将其与LLS动力学的直接积分结果进行了比较，显示出很好的一致性。

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