标题： 基于畴壁的人工突触的热稳定性和钉扎电流 显示英文标题

标题： Thermal Stability and Depinning Currents of Domain Wall-Based Artificial Synapses

摘要： 微磁建模被用于优化基于自旋轨道矩（SOT）驱动的纳米轨道上畴壁（DW）运动的人工突触器件的设计。 关键属性，如固定畴壁的热稳定性以及去钉扎电流，是针对不同的纳米轨道几何形状和钉扎强度获得的。 通过有限温度微磁模拟研究了去钉扎概率作为SOT电流密度和脉冲宽度的函数，对于不同的钉扎势能。 结果表明，较宽的凹槽提供了更好的热稳定性和去钉扎电流权衡。 另一方面，窄凹槽在有限温度下的去钉扎时间变化较小。 观察到，如果热稳定性足够高，可以通过SOT电流脉冲将DW位置精确设置到任何期望的位置。 还观察到，通过在矩形纳米轨道上添加具有逐渐增加的去钉扎电流的凹槽可以获得元塑性功能。 显示英文摘要

摘要： Micromagnetic modeling is employed to optimize the design of artificial synapse devices based on the spin-orbit-torque (SOT) driven domain wall (DW) motion along a nanotrack with triangular notches. Key attributes, such as the thermal stability of the pinned DW and depinning currents, are obtained for varied nanotrack geometry and pinning strength. Depinning probability as a function of SOT current density and pulse width is studied using finite temperature micromagnetic simulations for varying pinning potential. Results show that wider notches provide better thermal stability - depinning current trade-off. On the other hand, narrow notches exhibit less variation in the depinning times at finite temperatures. It is observed that the DW position can be set precisely to any desired location by the SOT current pulse if the thermal stability is sufficiently high. It is also observed that the meta-plastic functionality can be obtained by adding notches of progressively higher depinning currents along the rectangular nanotrack.