自旋电子学
材料科学
凝聚态物理
垂直的
光电子学
溅射沉积
自旋霍尔效应
扭矩
磁化
霍尔效应
图层(电子)
磁各向异性
溅射
磁场
铁磁性
薄膜
纳米技术
自旋极化
电子
物理
几何学
数学
量子力学
热力学
作者
Zhuoyi Li,Xianyang Lu,Zhe Zhang,Wenjia Li,TaoTao Li,Jian Zhou,Yu Yan,Ruobai Liu,Jun Du,R. H. Liu,Xinran Wang,Yao Li,Liang He,Jing Wu,R. Zhang,Yongbing Xu
摘要
Spin–orbit torque (SOT) is recognized as an effective way to manipulate magnetization in spintronic devices. For the low-power consumption and high-endurance requirements of future computer architectures, reducing the critical SOT switching current density and improving SOT efficiency are crucial, especially in the perpendicularly magnetized structures. Here, we have conducted a comprehensive study on improving the SOT efficiency of the Ta/CoFeB structure with a perpendicular magnetic anisotropy by inserting an oxide insulating layer Fe2O3 as the bottom layer. We found that only a 1–5 nm thickness of Fe2O3 significantly reduces the SOT critical switching current by 70% and enhances the spin Hall angle of Ta. The spin Hall angle increases from 0.078 for pure Ta/CoFeB to 0.13 for Fe2O3/Ta/CoFeB, and both types of spin–orbit torques, damping-like and field-like torques, are significantly enhanced. It is suggested that the atomic diffusion of O from the Fe2O3 underlayer leads to the partial oxidization of the Ta layer as well as the Ta/CoFeB interfaces, accounting for the observed enhanced SOT efficiency. Our results provide a reliable method to improve the SOT performance in perpendicularly magnetized structures by inserting the oxide underlayer using magnetron sputtering, in favor of its potential real-world application in spintronic devices.
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