Superparamagnetic tunnel junctions (SMTJs) are promising sources for the randomness required by some compact and energy-efficient computing schemes. Coupling SMTJs gives rise to collective behavior that could be useful for cognitive computing. We use a simple linear electrical circuit to mutually couple two SMTJs through their stochastic electrical transitions. When one SMTJ makes a thermally induced transition, the voltage across both SMTJs changes, modifying the transition rates of both. This coupling leads to significant correlation between the states of the two devices. Using fits to a generalized N\'eel-Brown model for the individual thermally bistable magnetic devices, we can accurately reproduce the behavior of the coupled devices with a Markov model.

中文翻译：

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两个电耦合超顺磁隧道结随机切换的互控

超顺磁隧道结 (SMTJ) 是一些紧凑且节能的计算方案所需的随机性的有希望的来源。耦合 SMTJ 会产生可能对认知计算有用的集体行为。我们使用简单的线性电路通过随机电转换将两个 SMTJ 相互耦合。当一个 SMTJ 进行热诱导转变时，两个 SMTJ 上的电压都会发生变化，从而改变两者的转变速率。这种耦合导致两个设备的状态之间存在显着的相关性。使用对单个热双稳态磁器件的广义 N\'eel-Brown 模型的拟合，我们可以使用马尔可夫模型准确地再现耦合器件的行为。