中国物理B ›› 2022, Vol. 31 ›› Issue (4): 48503-048503.doi: 10.1088/1674-1056/ac4cc4

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The 50 nm-thick yttrium iron garnet films with perpendicular magnetic anisotropy

Shuyao Chen(陈姝瑶)1, Yunfei Xie(谢云飞)1, Yucong Yang(杨玉聪)1, Dong Gao(高栋)1, Donghua Liu(刘冬华)2,†, Lin Qin(秦林)3, Wei Yan(严巍)1, Bi Tan(谭碧)1, Qiuli Chen(陈秋丽)1, Tao Gong(龚涛)1, En Li(李恩)1,3, Lei Bi(毕磊)1, Tao Liu(刘涛)1,‡, and Longjiang Deng(邓龙江)1   

  1. 1 National Engineering Research Center of Electromagnetic Radiation Control Materials, University of Electronic Science and Technology of China, Chengdu 610054, China;
    2 School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 610054, China;
    3 School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
  • 收稿日期:2021-12-16 修回日期:2022-01-17 接受日期:2022-01-19 出版日期:2022-03-16 发布日期:2022-03-29
  • 通讯作者: Donghua Liu, Tao Liu E-mail:dhliu@uestc.edu.cn;liu.tao@uestc.edu.cn
  • 基金资助:
    This work was supported by the National Natural Science Foundation of China (Grant Nos. 52072060 and 52021001), the National Key R&D Program of China (Grant No. 2021YFB2801600), and the China Postdoctoral Science Foundation (Grant No. 2021M700679).

The 50 nm-thick yttrium iron garnet films with perpendicular magnetic anisotropy

Shuyao Chen(陈姝瑶)1, Yunfei Xie(谢云飞)1, Yucong Yang(杨玉聪)1, Dong Gao(高栋)1, Donghua Liu(刘冬华)2,†, Lin Qin(秦林)3, Wei Yan(严巍)1, Bi Tan(谭碧)1, Qiuli Chen(陈秋丽)1, Tao Gong(龚涛)1, En Li(李恩)1,3, Lei Bi(毕磊)1, Tao Liu(刘涛)1,‡, and Longjiang Deng(邓龙江)1   

  1. 1 National Engineering Research Center of Electromagnetic Radiation Control Materials, University of Electronic Science and Technology of China, Chengdu 610054, China;
    2 School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 610054, China;
    3 School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
  • Received:2021-12-16 Revised:2022-01-17 Accepted:2022-01-19 Online:2022-03-16 Published:2022-03-29
  • Contact: Donghua Liu, Tao Liu E-mail:dhliu@uestc.edu.cn;liu.tao@uestc.edu.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (Grant Nos. 52072060 and 52021001), the National Key R&D Program of China (Grant No. 2021YFB2801600), and the China Postdoctoral Science Foundation (Grant No. 2021M700679).

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摘要： Yttrium iron garnet (YIG) films possessing both perpendicular magnetic anisotropy (PMA) and low damping would serve as ideal candidates for high-speed energy-efficient spintronic and magnonic devices. However, it is still challenging to achieve PMA in YIG films thicker than 20 nm, which is a major bottleneck for their development. In this work, we demonstrate that this problem can be solved by using substrates with moderate lattice mismatch with YIG so as to suppress the excessive strain-induced stress release as increasing the YIG thickness. After carefully optimizing the growth and annealing conditions, we have achieved out-of-plane spontaneous magnetization in YIG films grown on sGGG substrates, even when they are as thick as 50 nm. Furthermore, ferromagnetic resonance and spin pumping induced inverse spin Hall effect measurements further verify the good spin transparency at the surface of our YIG films.

关键词: spintronics, perpendicular magnetic anisotropy, magnetic thin film, deposition by sputtering

Abstract: Yttrium iron garnet (YIG) films possessing both perpendicular magnetic anisotropy (PMA) and low damping would serve as ideal candidates for high-speed energy-efficient spintronic and magnonic devices. However, it is still challenging to achieve PMA in YIG films thicker than 20 nm, which is a major bottleneck for their development. In this work, we demonstrate that this problem can be solved by using substrates with moderate lattice mismatch with YIG so as to suppress the excessive strain-induced stress release as increasing the YIG thickness. After carefully optimizing the growth and annealing conditions, we have achieved out-of-plane spontaneous magnetization in YIG films grown on sGGG substrates, even when they are as thick as 50 nm. Furthermore, ferromagnetic resonance and spin pumping induced inverse spin Hall effect measurements further verify the good spin transparency at the surface of our YIG films.

Key words: spintronics, perpendicular magnetic anisotropy, magnetic thin film, deposition by sputtering

中图分类号:  (Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields)

  • 85.75.-d
75.30.Gw (Magnetic anisotropy) 85.70.Kh (Magnetic thin film devices: magnetic heads (magnetoresistive, inductive, etc.); domain-motion devices, etc.) 81.15.Cd (Deposition by sputtering)