中国物理B ›› 2011, Vol. 20 ›› Issue (2): 27503-027503.doi: 10.1088/1674-1056/20/2/027503

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Study of NiCuZn ferrite powders and films prepared by sol–gel method

高良秋, 于国建, 王颖, 魏福林   

  1. Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000 China
  • 收稿日期:2010-08-09 修回日期:2010-09-28 出版日期:2011-02-15 发布日期:2011-02-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 61003041) and the Fundamental Research Funds for the Central Universities (Grant No. lzujbky-2010-81).

Study of NiCuZn ferrite powders and films prepared by sol–gel method

Gao Liang-Qiu(高良秋),Yu Guo-Jian(于国建), Wang Ying(王颖)†,and Wei Fu-Lin(魏福林)   

  1. Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000 China
  • Received:2010-08-09 Revised:2010-09-28 Online:2011-02-15 Published:2011-02-15
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 61003041) and the Fundamental Research Funds for the Central Universities (Grant No. lzujbky-2010-81).

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摘要： This paper reports that a series of NiCuZn ferrite powders and films are prepared by using sol--gel method. The effects of raw material composition and the calcinate temperature on magnetic properties of them are investigated. The NiCuZn ferrite powders are prepared by the self-propagating high-temperature synthesis method and subsequently heated at 700℃ ～ 1000℃. The results show that NiCuZn ferrite powders with single spinel phase can be formed after heat-treating at 750 du. Powders obtained from Ni0.4Cu0.2Zn0.4Fe1.9O4 gel have better magnetic properties than those from gels with other composition. After heat-treating at 900℃ for 3 h, coercivity Hc and saturation magnetization Ms are 9.7 Oe (1 Oe = 80 A/m) and 72.4 emu/g, respectively. Different from the powders, NiCuZn films produced on Si (100) from the Ni0.4Cu0.2Zn0.4Fe2O4 gel formed at room temperature possess high properties. When heat-treating condition is around 600℃ for 6 min, samples with low H_c and high M_s will be obtained. The minimal Hc is 16.7 Oe and Ms is about 300 emu/cm3. In comparison with the films prepared through long-time heat treating, the films prepared through short heat-treating time exhibits better soft magnetic properties.

关键词: sol--gel, NiCuZn ferrite, powder, film

Abstract: This paper reports that a series of NiCuZn ferrite powders and films are prepared by using sol–gel method. The effects of raw material composition and the calcinate temperature on magnetic properties of them are investigated. The NiCuZn ferrite powders are prepared by the self-propagating high-temperature synthesis method and subsequently heated at 700℃ ～1000℃. The results show that NiCuZn ferrite powders with single spinel phase can be formed after heat-treating at 750℃. Powders obtained from Ni0.4Cu0.2Zn0.4Fe1.9O4 gel have better magnetic properties than those from gels with other composition. After heat-treating at 900℃ for 3 h, coercivity Hc and saturation magnetization Ms are 9.7 Oe (1 Oe = 80 A/m) and 72.4 emu/g, respectively. Different from the powders, NiCuZn films produced on Si (100) from the Ni0.4Cu0.2Zn0.4Fe2O4 gel formed at room temperature possess high properties. When heat-treating condition is around 600℃ for 6 min, samples with low Hc and high Ms will be obtained. The minimal Hc is 16.7 Oe and Ms is about 300 emu/cm3. In comparison with the films prepared through long-time heat treating, the films prepared through short heat-treating time exhibits better soft magnetic properties.

Key words: sol–gel, NiCuZn ferrite, powder, film

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

  • 75.70.Ak
82.70.Gg (Gels and sols)