论文标题
调整自旋轨道扭矩驱动磁性隧道连接的纳秒转换
Tuning nanosecond switching of spin-orbit torque driven magnetic tunnel junctions
论文作者
论文摘要
自从重金属中旋转厅效应引起的旋转轨道扭矩（SOT）以来，已经大力努力地了解电荷到旋转转换的机制，以及为高速，低能磁性记录技术开发新方案。尽管通过在重金属通道中施加短电压脉冲在三个端子磁性隧道连接（3T-MTJ）中证明了快速开关，但由于多层磁性结构的复杂性和三端几何形状，缺乏对切换机制的详细理解。我们在这封信中表明，电流引起的有效场在快速开关中起着关键作用，并且通过调整所应用的外部场，我们可以很好地调整两个切换极性之间的脉冲切换的对称性，即平行于反平行（p-ap）和抗平行（p-ap）和平行于平行（ap-p）。这些结果表明，对详细磁性配置的操纵是快速切换的关键，并且是对SOT内存和进一步应用的未来优化的有用方法。
Since the discovery of the spin orbit torque (SOT) induced by spin Hall effect in heavy metals, much effort has been devoted to understanding the mechanism of the charge-to-spin conversion as well as to developing new schemes for high speed, low energy magnetic recording technologies. While fast switching has been demonstrated in three terminal magnetic tunnel junctions (3T-MTJs) through applying short voltage pulses in the heavy metal channel, detailed understanding of the switching mechanism is lacking due to the complexity of the multi-layered magnetic structure and the three-terminal geometry. We show in this letter that current-induced effective fields play a key role in the fast switching and by tuning the applied external field we can finely tune the symmetry of the pulse switching between two switching polarities, namely parallel to anti-parallel (P-AP) and anti-parallel to parallel (AP-P). These results show that the manipulation of detailed magnetic configuration is the key to fast switching and is a useful way for future optimization of SOT memory and further applications.
