中国物理B ›› 2023, Vol. 32 ›› Issue (10): 107507-107507.doi: 10.1088/1674-1056/acee57

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Spin-orbit torque in perpendicularly magnetized [Pt/Ni] multilayers

Ying Cao(曹颖)1,2, Zhicheng Xie(谢志成)1,2, Zhiyuan Zhao(赵治源)1,2, Yumin Yang(杨雨民)1,2, Na Lei(雷娜)3,†, Bingfeng Miao(缪冰锋)4, and Dahai Wei(魏大海)1,2,‡   

  1. 1 State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China;
    2 College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China;
    3 Fert Beijing Institute, MIIT Key Laboratory of Spintronics, School of Integrated Circuit Science and Engineering, Beihang University, Beijing 100191, China;
    4 National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China
  • 收稿日期:2023-06-25 修回日期:2023-07-19 接受日期:2023-08-09 出版日期:2023-09-21 发布日期:2023-09-22
  • 通讯作者: Na Lei, Dahai Wei E-mail:na.lei@buaa.edu.cn;dhwei@buaa.edu.cn
  • 基金资助:
    Project supported by the National Key R&D Program of China (Grant No. 2021YFB3502400), the National Natural Science Foundation of China (Grant Nos. 52061135105, 12074025, 11834013, and 12274203), the CAS Project for Yong Scientists in Basic Research (Grant No. YSBR-030), and the Key Research Project of Frontier Science of Chinese Academy of Sciences (Grant Nos. XDB44000000 and XDB28000000).

Spin-orbit torque in perpendicularly magnetized [Pt/Ni] multilayers

Ying Cao(曹颖)1,2, Zhicheng Xie(谢志成)1,2, Zhiyuan Zhao(赵治源)1,2, Yumin Yang(杨雨民)1,2, Na Lei(雷娜)3,†, Bingfeng Miao(缪冰锋)4, and Dahai Wei(魏大海)1,2,‡   

  1. 1 State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China;
    2 College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China;
    3 Fert Beijing Institute, MIIT Key Laboratory of Spintronics, School of Integrated Circuit Science and Engineering, Beihang University, Beijing 100191, China;
    4 National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China
  • Received:2023-06-25 Revised:2023-07-19 Accepted:2023-08-09 Online:2023-09-21 Published:2023-09-22
  • Contact: Na Lei, Dahai Wei E-mail:na.lei@buaa.edu.cn;dhwei@buaa.edu.cn
  • Supported by:
    Project supported by the National Key R&D Program of China (Grant No. 2021YFB3502400), the National Natural Science Foundation of China (Grant Nos. 52061135105, 12074025, 11834013, and 12274203), the CAS Project for Yong Scientists in Basic Research (Grant No. YSBR-030), and the Key Research Project of Frontier Science of Chinese Academy of Sciences (Grant Nos. XDB44000000 and XDB28000000).

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摘要： The performance of spin-orbit torque (SOT) in heavy metal/ferromagnetic metal periodic multilayers has attracted widespread attention. In this paper, we have successfully fabricated a series of perpendicular magnetized [Pt($2-t$)/Ni($t$)]$_{4}$ multilayers, and studied the SOT in the multilayers by varying the thickness of Ni layer $t$. The current induced magnetization switching was achieved with a critical current density of 1$\times10^{7}$ A/cm$^{2}$. The damping-like SOT efficiency $\xi_{\rm DL}$ was extracted from an extended harmonic Hall measurement. We demonstrated that the $\xi_{\rm DL}$ can be effectively modulated by $t_{\mathrm{Pt}}/t_{\mathrm{Ni}}$ ratio of Pt and Ni in the multilayers. The SOT investigation about the [Pt/Ni]$_{N}$ multilayers might provide new material candidates for practical perpendicular SOT-MRAM devices.

关键词: spin-orbit torque, perpendicular magnetic anisotropy, spintronics

Abstract: The performance of spin-orbit torque (SOT) in heavy metal/ferromagnetic metal periodic multilayers has attracted widespread attention. In this paper, we have successfully fabricated a series of perpendicular magnetized [Pt($2-t$)/Ni($t$)]$_{4}$ multilayers, and studied the SOT in the multilayers by varying the thickness of Ni layer $t$. The current induced magnetization switching was achieved with a critical current density of 1$\times10^{7}$ A/cm$^{2}$. The damping-like SOT efficiency $\xi_{\rm DL}$ was extracted from an extended harmonic Hall measurement. We demonstrated that the $\xi_{\rm DL}$ can be effectively modulated by $t_{\mathrm{Pt}}/t_{\mathrm{Ni}}$ ratio of Pt and Ni in the multilayers. The SOT investigation about the [Pt/Ni]$_{N}$ multilayers might provide new material candidates for practical perpendicular SOT-MRAM devices.

Key words: spin-orbit torque, perpendicular magnetic anisotropy, spintronics

中图分类号:  (Spin-orbit effects)

  • 75.70.Tj
75.30.Gw (Magnetic anisotropy) 75.50.Ss (Magnetic recording materials) 72.25.Ba (Spin polarized transport in metals)