中国物理B ›› 2015, Vol. 24 ›› Issue (4): 47503-047503.doi: 10.1088/1674-1056/24/4/047503

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

High frequency characteristics of (Ni75Fe2)x(ZnO)1-x granular thin films with tunable damping coefficient

李文春a, 左亚路b, 刘晓虹a, 魏清清a, 周雪云c, 姚东升a   

  1. a Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparation Technology, Faculty of Science, Tianjin University, Tianjin 300072, China;
    b The Key Laboratory for Magnetism and Magnetic Materials, Lanzhou University, Lanzhou 730000, China;
    c Faculty of Science, Jiujiang University, Jiujiang 332005, Jiangxi Province, China
  • 收稿日期:2014-10-19 修回日期:2014-11-25 出版日期:2015-04-05 发布日期:2015-04-05
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 50901050 and 51101079).

High frequency characteristics of (Ni75Fe2)x(ZnO)1-x granular thin films with tunable damping coefficient

Li Wen-Chun (李文春)a, Zuo Ya-Lu (左亚路)b, Liu Xiao-Hong (刘晓虹)a, Wei Qing-Qing (魏清清)a, Zhou Xue-Yun (周雪云)c, Yao Dong-Sheng (姚东升)a   

  1. a Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparation Technology, Faculty of Science, Tianjin University, Tianjin 300072, China;
    b The Key Laboratory for Magnetism and Magnetic Materials, Lanzhou University, Lanzhou 730000, China;
    c Faculty of Science, Jiujiang University, Jiujiang 332005, Jiangxi Province, China
  • Received:2014-10-19 Revised:2014-11-25 Online:2015-04-05 Published:2015-04-05
  • Contact: Yao Dong-Sheng E-mail:yaodsh@tju.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 50901050 and 51101079).

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摘要：

The effect of the volume fraction of ferromagnetic metal (x) in (Ni75Fe25)x(ZnO)1-x nanogranular thin films on microstructural, soft-magnetic, and high-frequency properties was investigated. Good soft-magnetic properties were obtained in a broad x range, with 0.55 < x < 0.82. High resolution transmission electron microscopy (HRTEM) observations reveal that the grain size of the samples is lower than 14 nm, and that it decreases with decreasing x. Of special interest, our investigation of the permeability spectra indicates that these films exhibit an adjustable frequency linewidth of resonance peak, dependant upon changing x. Correspondingly, large and adjustable damping coefficients (αeff) from 0.023 to 0.043 were achieved by decreasing x from 0.82 to 0.55. Combined with the HRTEM results, the variation of αeff with x was analyzed in detail.

关键词: soft magnetic properties, high frequency properties, damping factor, granular film

Abstract:

The effect of the volume fraction of ferromagnetic metal (x) in (Ni75Fe25)x(ZnO)1-x nanogranular thin films on microstructural, soft-magnetic, and high-frequency properties was investigated. Good soft-magnetic properties were obtained in a broad x range, with 0.55 < x < 0.82. High resolution transmission electron microscopy (HRTEM) observations reveal that the grain size of the samples is lower than 14 nm, and that it decreases with decreasing x. Of special interest, our investigation of the permeability spectra indicates that these films exhibit an adjustable frequency linewidth of resonance peak, dependant upon changing x. Correspondingly, large and adjustable damping coefficients (αeff) from 0.023 to 0.043 were achieved by decreasing x from 0.82 to 0.55. Combined with the HRTEM results, the variation of αeff with x was analyzed in detail.

Key words: soft magnetic properties, high frequency properties, damping factor, granular film

中图分类号:  (Magnetic properties of monolayers and thin films)

  • 75.70.Ak
75.30.Gw (Magnetic anisotropy) 75.78.-n (Magnetization dynamics) 75.50.Bb (Fe and its alloys)