电连接随机激励磁隧道结纳米柱的开关特性
Switching Characteristics of Electrically Connected Stochastically Actuated Magnetic Tunnel Junction Nanopillars
AI总结：
研究通过电连接随机激励磁隧道结纳米柱，揭示了其开关特性与伊辛耦合的关系。
摘要：
我们研究了纳米尺度的垂直磁隧道结（pMTJs）的随机动力学以及当它们电连接时出现的相关性。单个结表现出热激活的自旋转移扭矩开关，其转换概率可很好地用泊松过程描述。当两个结并联连接时，随着结电阻的变化，电路介导的电压重新分布会在实时中发生，导致相关开关行为。基于单个结统计开关特性和基尔霍夫定律的最小随机模型捕捉了耦合的开关概率，而马尔可夫链形式化描述了多脉冲驱动下的非平衡稳态。此外，这些电路介导的相互作用可以映射到伊辛哈密顿量的参数上，提供了有效自旋-自旋相互作用的解释。我们的结果展示了简单的电气连接如何生成伊辛样耦合和可调随机动力学在纳米磁体中。
英文摘要：
We investigate the stochastic dynamics of nanoscale perpendicular magnetic tunnel junctions (pMTJs) and the correlations that arise when they are electrically coupled. Individual junctions exhibit thermally activated spin-transfer torque switching with transition probabilities that are well described by a Poisson process. When two junctions are connected in parallel, circuit-mediated redistribution of voltages that occurs in real time as the junction resistances change leads to correlated switching behavior. A minimal stochastic model based on single-junction statistical switching properties and Kirchhoff's laws captures the coupled switching probabilities, while a Markov-chain formalism describes nonequilibrium steady states under multi-pulse driving. Further, these circuit-mediated interactions can be mapped onto the parameters of an Ising Hamiltonian, providing an interpretation in terms of effective spin-spin interactions. Our results demonstrate how simple electrical connections can generate Ising-like couplings and tunable stochastic dynamics in nanoscale magnets.
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