中国物理B ›› 2025, Vol. 34 ›› Issue (10): 107509-107509.doi: 10.1088/1674-1056/adf31e

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Characterization of interlayer coupling in YIG/Py bilayer using polarized neutron reflectometry

He Bai(白鹤)1,2, Wei He(何为)3, Dan Liu(刘丹)4, Jialiang Li(李嘉亮)1,2, Xiao Deng(邓霄)2,5, Yuan Sun(孙远)1,2, Songwen Xiao(肖松文)1,2, Sheng Cheng(成晟)1,2, Xiaozhi Zhan(詹晓芝)1,2, Jianwang Cai(蔡建旺)3, and Tao Zhu(朱涛)2,3,6,†   

  1. 1 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;
    2 Spallation Neutron Source Science Center, Dongguan 523803, China;
    3 Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    4 Department of Physics, Beijing Technology and Business University, Beijing 100048, China;
    5 University of Science and Technology Beijing, Beijing 100083, China;
    6 Songshan Lake Material Laboratory, Dongguan 523808, China
  • 收稿日期:2025-07-09 修回日期:2025-07-09 接受日期:2025-07-23 出版日期:2025-09-25 发布日期:2025-10-11
  • 通讯作者: Tao Zhu E-mail:tzhu@iphy.ac.cn
  • 基金资助:
    This work was supported by the National Key Basic Research Program of China (Grant Nos. 2021YFA1400300 and 2023YFA1610400), the National Natural Science Foundation of China (Grant Nos. 12204268, 52371169, 52130103, and U22A20263), the Guangdong Basic and Applied Basic Research Foundation (Grant No. 2023B1515120015), and the Open Research Fund of Songshan Lake Materials Laboratory (Grant No. 2022SLABFN13). PNR experiments were conducted at the Beamline MR of the Chinese Spallation Neutron Source.

Characterization of interlayer coupling in YIG/Py bilayer using polarized neutron reflectometry

He Bai(白鹤)1,2, Wei He(何为)3, Dan Liu(刘丹)4, Jialiang Li(李嘉亮)1,2, Xiao Deng(邓霄)2,5, Yuan Sun(孙远)1,2, Songwen Xiao(肖松文)1,2, Sheng Cheng(成晟)1,2, Xiaozhi Zhan(詹晓芝)1,2, Jianwang Cai(蔡建旺)3, and Tao Zhu(朱涛)2,3,6,†   

  1. 1 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;
    2 Spallation Neutron Source Science Center, Dongguan 523803, China;
    3 Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    4 Department of Physics, Beijing Technology and Business University, Beijing 100048, China;
    5 University of Science and Technology Beijing, Beijing 100083, China;
    6 Songshan Lake Material Laboratory, Dongguan 523808, China
  • Received:2025-07-09 Revised:2025-07-09 Accepted:2025-07-23 Online:2025-09-25 Published:2025-10-11
  • Contact: Tao Zhu E-mail:tzhu@iphy.ac.cn
  • Supported by:
    This work was supported by the National Key Basic Research Program of China (Grant Nos. 2021YFA1400300 and 2023YFA1610400), the National Natural Science Foundation of China (Grant Nos. 12204268, 52371169, 52130103, and U22A20263), the Guangdong Basic and Applied Basic Research Foundation (Grant No. 2023B1515120015), and the Open Research Fund of Songshan Lake Materials Laboratory (Grant No. 2022SLABFN13). PNR experiments were conducted at the Beamline MR of the Chinese Spallation Neutron Source.

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摘要： The complex interplay of magnetic interactions at the yttrium iron garnet (YIG)/ferromagnet interface is important for spintronic and magnonic devices. In this study, we present a comprehensive investigation of the interlayer coupling and switching mechanisms in YIG/Py (permalloy) heterostructures based on gadolinium gallium garnet (GGG) and SiO$_{2}$ substrates. We observe antiferromagnetic interlayer coupling between Py and YIG on SiO$_{2}$ substrates, whereas ferromagnetic interlayer coupling is observed on GGG substrates. Using polarized neutron reflectometry with depth- and element-resolved measurements, we obtain an in-depth understanding of the magnetic interactions between the YIG and Py layers. We demonstrate that polycrystalline YIG gives rise to antiferromagnetic interlayer coupling. This work provides valuable insights into designing and controlling magnetic coupling in hybrid structures for spintronic applications.

关键词: interlayer coupling, polarized neutron reflectivity, yttrium iron garnets

Abstract: The complex interplay of magnetic interactions at the yttrium iron garnet (YIG)/ferromagnet interface is important for spintronic and magnonic devices. In this study, we present a comprehensive investigation of the interlayer coupling and switching mechanisms in YIG/Py (permalloy) heterostructures based on gadolinium gallium garnet (GGG) and SiO$_{2}$ substrates. We observe antiferromagnetic interlayer coupling between Py and YIG on SiO$_{2}$ substrates, whereas ferromagnetic interlayer coupling is observed on GGG substrates. Using polarized neutron reflectometry with depth- and element-resolved measurements, we obtain an in-depth understanding of the magnetic interactions between the YIG and Py layers. We demonstrate that polycrystalline YIG gives rise to antiferromagnetic interlayer coupling. This work provides valuable insights into designing and controlling magnetic coupling in hybrid structures for spintronic applications.

Key words: interlayer coupling, polarized neutron reflectivity, yttrium iron garnets

中图分类号:  (Magnetic properties of thin films, surfaces, and interfaces)

  • 75.70.-i
75.30.Et (Exchange and superexchange interactions) 61.05.fj (Neutron reflectometry)