Sub-ns Field-Free Switching in Perpendicular Magnetic Tunnel Junctions by the Interplay of Spin Transfer and Orbit Torques
Sub-ns Field-Free Switching in Perpendicular Magnetic Tunnel Junctions by the Interplay of Spin Transfer and Orbit Torques
复制标题
通过自旋转移和轨道扭矩相互作用实现垂直磁隧道结的亚纳秒无场切换
DOI：
10.1109/led.2021.3069391
复制
发表时间：
2021-05-01
影响因子：
4.9
通讯作者：
Zhao, Weisheng
中科院分区：
文献类型：
--
作者：
Cai, Wenlong;Shi, Kewen;Zhao, Weisheng
自旋转移扭矩(STT)和自旋轨道扭矩(SOT)的相互作用突出了电流诱导磁化反转在超高速和超低功率存储应用中的潜力。然而，超快无场开关及其动力学机制还没有被阐明。在这里，我们实验演示了垂直磁隧道结(MTJ)中STT和SOT相互作用的亚纳秒级无场开关。对STT和SOT开关的动态研究表明，外加SOT电流可以大大缩短STT的孕育时间和电流密度，从而实现超快开关。此外，还进行了SOT和STT脉冲的时序方案研究。首次施加的SOT电流进一步缩短了磁化转变的转变时间，这可能是由于磁畴的形核和运动不同造成的。STT和SOT的相互作用和时序操作为高速、大可扩展和高能效的存储应用提供了更灵活的解决方案。
The interplay of spin-transfer torque (STT) and spin-orbit torque (SOT) highlights the potential of current-induced magnetization reversal for the ultrahigh-speed and ultralow-power memory applications. However, the ultrafast field-free switching and its dynamic mechanism have not been clarified yet. Here, we experimentally demonstrate the sub-nanosecond field-free switching by the interplay of STT and SOT in perpendicular magnetic tunnel junctions (MTJs). The dynamic investigations of the STT and SOT switching reveal that the applied SOT current can highly decrease the incubation time and current density of STT, which leads to the achievement of ultra-fast switching. Besides, the timing scheme investigations of SOT and STT pulses are performed. The firstly applied SOT current further decreases the transition time of the magnetization switching, which could result from the different nucleation and motions of domains. The interplay and the timing operations of STT and SOT provide more flexible solutions for high-speed, large-scalability and energy efficient memory applications.