High‐Efficiency Spin–Orbit Torque Switching Using a Single Heavy‐Metal Alloy with Opposite Spin Hall Angles,Advanced Electronic Materials

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High‐Efficiency Spin–Orbit Torque Switching Using a Single Heavy‐Metal Alloy with Opposite Spin Hall Angles
Advanced Electronic Materials ( IF 5.3 ) Pub Date : 2020-11-30 , DOI: 10.1002/aelm.202000793
Zelalem Abebe Bekele ₁ , Xionghua Liu _{1,

2} , Yi Cao _{1,

3} , Kaiyou Wang _{1,

2,

3}

Affiliation

Spin–orbit torque (SOT) induced perpendicular magnetization switching in Pt_1‐xGd_x/Co/Al₂O₃ heterostructure with x = 0, 0.02, 0.14, 0.30, and 0.33 is investigated. With in‐plane charge current flowing through the Pt_1‐xGd_x layer, field‐free current‐induced magnetization switching is observed for all nonzero x due to the existence of opposite spin Hall angles (θ_SHA) from Pt_1‐xGd_x alloys. Furthermore, the large θ_SHA of about 0.27 is obtained in the optimal Pt_0.70Gd_0.30 alloy films, which is about four times larger than that of the pure Pt. This work suggests a simple and scalable method for realizing field‐free SOT switching, and provides potential candidates of spin Hall materials that can be used to produce highly efficient SOTs.

中文翻译：

使用具有相反旋转霍尔角的单一重金属合金进行的高效自旋轨道扭矩切换

研究了X = 0、0.02、0.14、0.30和0.33的Pt _1–x Gd _x / Co / Al ₂ O ₃异质结构中自旋轨道转矩（SOT）引起的垂直磁化转换。当平面内充电电流流过Pt _1-x Gd _x层时，由于存在与Pt _1-x Gd相反的自旋霍尔角（_θSHA），因此观察到所有非零x的无场电流感应磁化切换。_x合金。此外，大的θ _SHA在最佳的Pt得到的约0.27 _0.70钆_0.30合金膜，是纯Pt的四倍左右。这项工作为实现无场SOT切换提供了一种简单且可扩展的方法，并提供了可用于生产高效SOT的自旋霍尔材料的潜在候选方案。

更新日期：2021-01-14

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