Interlayer exchange coupling modulated spin-orbit torque and multi-state switching in GdCo/Ru/GdCo heterostructures

doi:10.1088/1361-6463/ac1d74

IMR OpenIR

	Interlayer exchange coupling modulated spin-orbit torque and multi-state switching in GdCo/Ru/GdCo heterostructures
	Liu,Long 1,2; Zhao,Xiaotian 1; Liu,Wei 1; Song,Yuhang 1,2; Zhao,Xinguo 1; Zhang,Zhidong 1
通讯作者	Liu,Wei()
	2021-09-22
发表期刊	Journal of Physics D: Applied Physics
ISSN	0022-3727
卷号	54 期号:50
摘要	AbstractThe interlayer exchange coupling (IEC) in a synthetic antiferromagnet (SAF) contributes to the spin-orbit torque (SOT) effect. In this work, we study the SOT switching mechanism in a GdCo/Ru/GdCo SAF structure by varying the thickness of Ru (tRu). It is found that the IEC changes from ferromagnetic to antiferromagnetic and then back to ferromagnetic coupling with increasing tRu. By performing harmonic Hall measurements, it is confirmed that the antiferromagnetic IEC between two GdCo layers through Ru can significantly enhance the SOT, and a spin torque efficiency of up to 0.71 is obtained. Depending on the sign and strength of the IEC, the combination of SOT and IEC leads to various current-induced switching models. For samples with strong ferromagnetic and antiferromagnetic IEC, the magnetization switching between two parallel or antiparallel states is achieved. The current-induced multi-state switching processes, including four-steps-four-states and six-steps-four-states, are observed for samples with weakened IEC when tRu is thicker than 0.57 nm. Our results enrich the SOT switching mechanism in SAF structures composed of rare-earth-transition-metal alloys.
关键词	interlayer exchange coupling spin-orbit torque multi-state switching synthetic antiferromagnet heterostructures
DOI	10.1088/1361-6463/ac1d74
语种	英语
WOS记录号	IOP:0022-3727-54-50-ac1d74
出版者	IOP Publishing
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/166768
专题	中国科学院金属研究所
通讯作者	Liu,Wei
作者单位	1.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China 2.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, People’s Republic of China
推荐引用方式 GB/T 7714	Liu,Long,Zhao,Xiaotian,Liu,Wei,et al. Interlayer exchange coupling modulated spin-orbit torque and multi-state switching in GdCo/Ru/GdCo heterostructures[J]. Journal of Physics D: Applied Physics,2021,54(50).
APA	Liu,Long,Zhao,Xiaotian,Liu,Wei,Song,Yuhang,Zhao,Xinguo,&Zhang,Zhidong.(2021).Interlayer exchange coupling modulated spin-orbit torque and multi-state switching in GdCo/Ru/GdCo heterostructures.Journal of Physics D: Applied Physics,54(50).
MLA	Liu,Long,et al."Interlayer exchange coupling modulated spin-orbit torque and multi-state switching in GdCo/Ru/GdCo heterostructures".Journal of Physics D: Applied Physics 54.50(2021).