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arXiv 1606.09211cond-mat.mes-hall
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热电噪声诱导的电耦合随机磁振子的同步

Synchronization of electrically coupled stochastic magnetic oscillators induced by thermal and electrical noise

A. Mizrahi, N. Locatelli, J. Grollier, D. Querlioz

摘要:

超顺磁性隧道结是一种在热噪声作用下自激振荡的纳米结构。最近的工作表明,尽管它们的随机性,这样的结具有同步的亚阈值电压驱动的能力,在某种程度上,可以通过增加噪声来增强或控制。在这项工作中,我们研究了一个系统组成的两个电耦合结,串联连接到一个周期性的电压源。我们利用数值模拟和分析模型来证明,这两个结可以锁相驱动器,在相位或反相。这种同步现象可以由热噪声和电噪声来控制,尽管这两种类型的噪声引起性质上不同的行为。也就是说,热噪声可以稳定一个结被锁相到驱动电压而另一个结被阻断在一个状态的状态。相反,电噪声导致结具有高度相关的行为,因此不能诱导后者。这些结果为超顺磁性隧道结的设计开辟了道路,这些隧道结可以通过同步进行计算,并且从热噪声中获得最大部分的能量消耗。

英文摘要:

Superparamagnetic tunnel junctions are nanostructures that auto-oscillate stochastically under the effect of thermal noise. Recent works showed that despite their stochasticity, such junctions possess a capability to synchronize to subthreshold voltage drives, in a way that can be enhanced or controlled by adding noise. In this work, we investigate a system composed of two electrically coupled junctions, connected in series to a periodic voltage source. We make use of numerical simulations and of an analytical model to demonstrate that both junctions can be phase-locked to the drive, in phase or in anti-phase. This synchronization phenomenon can be controlled by both thermal and electrical noises, although the two types of noises induce qualitatively different behaviors. Namely, thermal noise can stabilize a regime where one junction is phase-locked to the drive voltage while the other is blocked in one state. On the contrary, electrical noise causes the junctions to have highly correlated behaviors and thus cannot induce the latter. These results open the way for the design of superparamagnetic tunnel junctions that can perform computation through synchronization, and which harvest the largest part of their energy consumption from thermal noise.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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