中国物理B ›› 2023, Vol. 32 ›› Issue (5): 54202-054202.doi: 10.1088/1674-1056/aca7f1

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Synthesis, magnetic and electromagnetic wave absorption properties of planar anisotrop Y2Co17@SiO2 rare earth soft magnetic composites

Liang Qiao(乔亮)1,†, Cheng-Fa Tu(涂成发)1, Wei Wu(吴伟)1, Wen-Biao Wang(王文彪)1, Sheng-Yu Yang(杨晟宇)1, Sun Zhe(孙哲)1, Peng Wu(吴鹏)1, Jin-Bo Yang(杨金波)2, Chang-Sheng Wang(王常生)2, Tao Wang(王涛)1, and Fa-Shen Li(李发伸)1   

  1. 1 Institute of Applied Magnetism, Key Laboratory for Magnetism and Magnetic Materials of Ministry of Education, Lanzhou University, Lanzhou 730000, China;
    2 School of Physics, Peking University, Beijing 100871, China
  • 收稿日期:2022-10-24 修回日期:2022-11-25 接受日期:2022-12-02 出版日期:2023-04-21 发布日期:2023-05-05
  • 通讯作者: Liang Qiao E-mail:qiaoliang@lzu.edu.cn
  • 基金资助:
    Project supported by the National Key Research and Development Program of China (Grant No. 2021YFB3501302), the National Natural Science Foundation of China (Grant No. 51731001), and the Fund from the State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization's Key Research and Development Projects.

Synthesis, magnetic and electromagnetic wave absorption properties of planar anisotrop Y2Co17@SiO2 rare earth soft magnetic composites

Liang Qiao(乔亮)1,†, Cheng-Fa Tu(涂成发)1, Wei Wu(吴伟)1, Wen-Biao Wang(王文彪)1, Sheng-Yu Yang(杨晟宇)1, Sun Zhe(孙哲)1, Peng Wu(吴鹏)1, Jin-Bo Yang(杨金波)2, Chang-Sheng Wang(王常生)2, Tao Wang(王涛)1, and Fa-Shen Li(李发伸)1   

  1. 1 Institute of Applied Magnetism, Key Laboratory for Magnetism and Magnetic Materials of Ministry of Education, Lanzhou University, Lanzhou 730000, China;
    2 School of Physics, Peking University, Beijing 100871, China
  • Received:2022-10-24 Revised:2022-11-25 Accepted:2022-12-02 Online:2023-04-21 Published:2023-05-05
  • Contact: Liang Qiao E-mail:qiaoliang@lzu.edu.cn
  • Supported by:
    Project supported by the National Key Research and Development Program of China (Grant No. 2021YFB3501302), the National Natural Science Foundation of China (Grant No. 51731001), and the Fund from the State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization's Key Research and Development Projects.

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摘要： Intermetallic complexes of rare-earth and 3d transition metals with core-shell structures are commonly employed as microwave absorbing materials due to their high saturation magnetizations and natural resonance in GHz. Hence, we synthesized Y2Co17 alloy via the co-precipitation reduction-diffusion technique, then coated the Y2Co17 magnetic powders with SiO2 to create Y2Co17@SiO2 core-shell structures. The formation of Y2Co17@SiO2/polyurethane (PU) at various volume fractions and their magnetic, electromagnetic properties were investigated using x-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, and vector network analyzer. The microwave absorption characteristics of Y2Co17@SiO2/PU were also investigated at various volume fractions. We not only investigate the zero-reflection conditions of the samples with different volume fractions, but also show that every absorber has a strong reflection loss value (RL ≤ -65.00 dB) and excellent microwave absorption properties with an average RL of Y2Co 17@SiO2/PU being below -10 dB at 8 GHz-18 GHz under different thicknesses, showing that the enhancement of microwave absorption performance arises from the balance between permeability and permittivity of absorber.

关键词: Y2Co17@SiO2, Co-precipitation reduction diffusion, microwave absorption, zero-reflection condition, reflection loss

Abstract: Intermetallic complexes of rare-earth and 3d transition metals with core-shell structures are commonly employed as microwave absorbing materials due to their high saturation magnetizations and natural resonance in GHz. Hence, we synthesized Y2Co17 alloy via the co-precipitation reduction-diffusion technique, then coated the Y2Co17 magnetic powders with SiO2 to create Y2Co17@SiO2 core-shell structures. The formation of Y2Co17@SiO2/polyurethane (PU) at various volume fractions and their magnetic, electromagnetic properties were investigated using x-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, and vector network analyzer. The microwave absorption characteristics of Y2Co17@SiO2/PU were also investigated at various volume fractions. We not only investigate the zero-reflection conditions of the samples with different volume fractions, but also show that every absorber has a strong reflection loss value (RL ≤ -65.00 dB) and excellent microwave absorption properties with an average RL of Y2Co 17@SiO2/PU being below -10 dB at 8 GHz-18 GHz under different thicknesses, showing that the enhancement of microwave absorption performance arises from the balance between permeability and permittivity of absorber.

Key words: Y2Co17@SiO2, Co-precipitation reduction diffusion, microwave absorption, zero-reflection condition, reflection loss

中图分类号:  (Wave propagation, transmission and absorption)

  • 42.25.Bs
75.50.Bb (Fe and its alloys) 76.30.Kg (Rare-earth ions and impurities) 78.20.Ci (Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))