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Spin-orbit torque in antiferromagnetically coupled Co and Tb multilayers
Physica Scripta ( IF 2.9 ) Pub Date : 2020-05-18 , DOI: 10.1088/1402-4896/ab8d58
Y C Wu , K K Meng , Q B Liu , S Q Zheng , J Miao , X G Xu , Y Jiang

We report the enhancement of spin–orbit torque (SOT) in Pt/Co/Pt and Pt/Co/AlOx multilayers by inserting rare-earth metal Tb layer. The inserted Tb layer thickness dependence of the critical switching current indicates that thicker Tb layer lead to more enhancement. The higher efficiency of SOT can be attributed to the increase of the effective spin Hall angle after inserting Tb layer, which has also been proved through the spin Hall magnetoresistance measurement. The temperature dependence of anomalous Hall effect and remanent magnetization reveals that the Pt/Co/Tb (2 nm)/AlOx sample is antiferromagnetically coupled below 320 K. The behavior of the temperature dependent SOT effective fields and effective spin Hall angle in the Pt/Co/Tb (2 nm)/AlOx sample have also been investigated, which increase substantially when temperature decreased from 300 to 100 K. We suggest that the significant increase of SOT efficiency is ascribed to the antiferromagnetically coupled Co and Tb layer.

中文翻译:

反铁磁耦合的 Co 和 Tb 多层中的自旋轨道扭矩

我们报告了通过插入稀土金属 Tb 层来增强 Pt/Co/Pt 和 Pt/Co/AlOx 多层中的自旋轨道扭矩(SOT)。临界开关电流的插入 Tb 层厚度依赖性表明更厚的 Tb 层导致更多的增强。SOT 的更高效率可归因于插入 Tb 层后有效自旋霍尔角的增加,这也通过自旋霍尔磁阻测量得到了证明。异常霍尔效应和剩磁的温度依赖性表明,Pt/Co/Tb (2 nm)/AlOx 样品在 320 K 以下反铁磁耦合。温度相关的 SOT 有效场和有效自旋霍尔角在 Pt/还研究了 Co/Tb (2 nm)/AlOx 样品,
更新日期:2020-05-18
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