论文标题
由旋转轨道驱动的磁性隧道连接的无现场切换在子-NS时标
Field-free switching of magnetic tunnel junctions driven by spin-orbit torques at sub-ns timescales
论文作者
论文摘要
我们报告在垂直磁化磁性隧道连接（MTJ）中没有外部磁场的情况下，在没有外部磁场的情况下，通过自旋轨道扭矩进行了时间分辨的测量。无场开关是通过在MTJ堆栈上方集成的平面磁化层的偶极场启用的，该堆栈的方向决定了开关极性。实时单发测量可直接证明磁化反转和切换分布。接近临界切换电压，我们观察到由于磁化逆转之前的有限孵育延迟，因此观察到随机逆转事件。将脉冲振幅增加到两倍的临界电压后，逆转变为准确曲，从而在零外场的子-NS时尺尺度上导致可靠的双极切换。我们进一步研究了MTJ和外部磁场的DC偏置的开关概率，从而洞悉了确定临界开关电压的参数。
We report time-resolved measurements of magnetization switching by spin-orbit torques in the absence of an external magnetic field in perpendicularly magnetized magnetic tunnel junctions (MTJ). Field-free switching is enabled by the dipolar field of an in-plane magnetized layer integrated above the MTJ stack, the orientation of which determines the switching polarity. Real-time single-shot measurements provide direct evidence of magnetization reversal and switching distributions. Close to the critical switching voltage we observe stochastic reversal events due to a finite incubation delay preceding the magnetization reversal. Upon increasing the pulse amplitude to twice the critical voltage the reversal becomes quasi-deterministic, leading to reliable bipolar switching at sub-ns timescales in zero external field. We further investigate the switching probability as a function of dc bias of the MTJ and external magnetic field, providing insight on the parameters that determine the critical switching voltage.
