In contrast to classical charge-based memories, the binary information in redox-based resistive switching devices is decoded by a change of the atomic configuration rather than changing the amount of stored electrons. This offers in principle a higher scaling potential as ions are not prone to tunneling and the information is not lost by tunneling. The switching speed, however, is potentially smaller since the ionic mass is much higher than the electron mass. In this work, the ultimate switching speed limit of redox-based resistive switching devices is discussed. Based on a theoretical analysis of the underlying physical processes, it is derived that the switching speed is limited by the phonon frequency. This limit is identical when considering the acceleration of the underlying processes by local Joule heating or by high electric fields. Electro-thermal simulations show that a small filamentary volume can be heated up in picoseconds. Likewise, the characteristic charging time of a nanocrossbar device can be even below ps. In principle, temperature and voltage can be brought fast enough to the device to reach the ultimate switching limit. In addition, the experimental route and the challenges towards reaching the ultimate switching speed limit are discussed. So far, the experimental switching speed is limited by the measurement setup.

中文翻译：

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基于氧化还原的电阻式开关设备的极限开关速度极限

与传统的基于电荷的存储器相比，基于氧化还原的电阻式开关设备中的二进制信息是通过原子构型的变化而不是通过存储电子数量的变化来解码的。原则上，这提供了更高的缩放潜力，因为离子不易于隧穿，并且信息不会因隧穿而丢失。但是，由于离子质量远高于电子质量，因此切换速度可能会更小。在这项工作中，讨论了基于氧化还原的电阻式开关器件的极限开关速度极限。根据对基本物理过程的理论分析，可以得出开关速度受声子频率限制。当考虑通过局部焦耳加热或高电场来加速基础过程时，此限制是相同的。电热模拟表明，很小的丝状体积可以在皮秒内被加热。同样，纳米交叉开关设备的特征性充电时间甚至可以低于ps。原则上，温度和电压可以足够快地到达设备，以达到极限开关极限。此外，还讨论了实验路线和达到极限开关速度极限的挑战。到目前为止，实验性的切换速度受测量设置的限制。讨论了实验路线以及达到极限开关速度极限的挑战。到目前为止，实验性的切换速度受测量设置的限制。讨论了实验路线以及达到极限开关速度极限的挑战。到目前为止，实验性的切换速度受测量设置的限制。