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arXiv 1707.06648cond-mat.mtrl-scicond-mat.stat-mechphysics.data-an
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电阻开关的随机动力学:波动导致最佳粒子数

Stochastic Dynamics of Resistive Switching: Fluctuations Lead to Optimal Particle Number

Paul K. Radtke, Andrew L. Hazel, Arthur V. Straube, Lutz Schimansky-Geier

摘要:

电阻开关是构建新型非易失性随机存取存储器的最重要的候选者之一。这种存储单元的任何实际实现都需要强大的小型化,此时波动开始发挥不可忽视的作用。详细了解开关机制和可靠性至关重要。为此,我们制定了一个粒子模型的基础上的随机运动的氧空位。它使我们能够调查具有两个活动区的开关的电阻状态的波动。空位的动态由主方程控制。在施加电压脉冲时,空位集体行进通过开关。通过导出广义Burgers方程,我们可以将这种集体运动解释为非线性行波,并数值验证了这一结果。进一步,我们利用空位分布定义了二进制逻辑状态,并建立了一个用电压脉冲读写这种存储元件的框架。考虑到这些操作在波动下的可辨别性以及阻变效应本身的显著性,得出结论:中间空位数对于性能是最佳的。

英文摘要:

Resistive switching is one of the foremost candidates for building novel types of non-volatile random access memories. Any practical implementation of such a memory cell calls for a strong miniaturization, at which point fluctuations start playing a role that cannot be neglected. A detailed understanding of switching mechanisms and reliability is essential. For this reason, we formulate a particle model based on the stochastic motion of oxygen vacancies. It allows us to investigate fluctuations in the resistance states of a switch with two active zones. The vacancies' dynamics is governed by a master equation. Upon the application of a voltage pulse, the vacancies travel collectively through the switch. By deriving a generalized Burgers equation we can interpret this collective motion as nonlinear traveling waves, and numerically verify this result. Further, we define binary logical states by means of the underlying vacancy distributions, and establish a framework of writing and reading such memory element with voltage pulses. Considerations about the dis- criminability of these operations under fluctuations together with the markedness of the resistive switching effect itself lead to the conclusion, that an intermediate vacancy number is optimal for performance.

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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