中国物理B ›› 2014, Vol. 23 ›› Issue (3): 37505-037505.doi: 10.1088/1674-1056/23/3/037505

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

Co1-xZnxFe2O4 nanofiber：Synthesized by electrospinning and its magnetic properties

戴剑锋a b, 路瑞娥b, 付比c, 高锟d, 张亮亮d   

  1. a State Key Laboratory of Gansu Advanced Non Ferrous Metal Materials, Lanzhou 730050, China;
    b School of Science, Lanzhou University of Technology, Lanzhou 730050, China;
    c Frontier Institute of Science and Technology, Xi’an Jiaotong University, Xi’an 710000, China;
    d State Key Laboratory for Manufacturing Engineering, Xi’an Jiaotong University, Xi’an 710000, China
  • 收稿日期:2013-05-31 修回日期:2013-07-19 出版日期:2014-03-15 发布日期:2014-03-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 50873047) and the Foundation of Gansu Education Department, China (Grant No. 0603-02).

Co1-xZnxFe2O4 nanofiber：Synthesized by electrospinning and its magnetic properties

Dai Jian-Feng (戴剑锋)a b, Lu Rui-E (路瑞娥)b, Fu Bi (付比)c, Gao Kun (高锟)d, Zhang Liang-Liang (张亮亮)d   

  1. a State Key Laboratory of Gansu Advanced Non Ferrous Metal Materials, Lanzhou 730050, China;
    b School of Science, Lanzhou University of Technology, Lanzhou 730050, China;
    c Frontier Institute of Science and Technology, Xi’an Jiaotong University, Xi’an 710000, China;
    d State Key Laboratory for Manufacturing Engineering, Xi’an Jiaotong University, Xi’an 710000, China
  • Received:2013-05-31 Revised:2013-07-19 Online:2014-03-15 Published:2014-03-15
  • Contact: Dai Jian-Feng E-mail:daijf@lut.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 50873047) and the Foundation of Gansu Education Department, China (Grant No. 0603-02).

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摘要： Well-aligned and uniform Co0.8Zn0.2Fe2O4 nanofibers (NFs) are prepared by electrospinning via sol–gel and subsequent heat treatment. Each of the as-spun NFs has a diameter of about 300 nm and a smooth surface morphology. The scanning electron microscope (SEM) image shows that the diameter decreases to 70 nm after the Co0.8Zn0.2Fe2O4 NF has been annealed at 650 ℃ for 3 h. The structure and chemical of Co0.8Zn0.2Fe2O4 NF are investigated by X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDS), respectively. Single phase cubic spinel structure, Co0.8Zn0.2Fe2O4 NF, is successfully obtained after having been calcined at 550 ℃ in air for 3 h, and a reduced lattice constant of the Co0.8Zn0.2Fe2O4 NF provides the evidence of effective Zn2+ substitution. The magnetic measurements show that the substitution of Zn2+ for Co2+, i.e., the introduction of non-magnetic Zn2+ ions into A sites, can increase the saturation magnetization (Ms) and reduce the coercivity (Hc). The obtained Hc results of different samples reveal that the critical single-domain size of the Co0.8Zn0.2Fe2O4 NF is approximately 44 nm. By doping Zn2+ with different concentrations, the morphologies of Co1-xZnxFe2O4 (0≤ x ≤ 0.5) NFs do not show obvious changes. For magnetic properties, the Ms increases and Hc decreases monotonically, respectively.

关键词: alignment, Co0.8Zn0.2Fe2O4, single-domain, Co1-xZnxFe2O4

Abstract: Well-aligned and uniform Co0.8Zn0.2Fe2O4 nanofibers (NFs) are prepared by electrospinning via sol–gel and subsequent heat treatment. Each of the as-spun NFs has a diameter of about 300 nm and a smooth surface morphology. The scanning electron microscope (SEM) image shows that the diameter decreases to 70 nm after the Co0.8Zn0.2Fe2O4 NF has been annealed at 650 ℃ for 3 h. The structure and chemical of Co0.8Zn0.2Fe2O4 NF are investigated by X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDS), respectively. Single phase cubic spinel structure, Co0.8Zn0.2Fe2O4 NF, is successfully obtained after having been calcined at 550 ℃ in air for 3 h, and a reduced lattice constant of the Co0.8Zn0.2Fe2O4 NF provides the evidence of effective Zn2+ substitution. The magnetic measurements show that the substitution of Zn2+ for Co2+, i.e., the introduction of non-magnetic Zn2+ ions into A sites, can increase the saturation magnetization (Ms) and reduce the coercivity (Hc). The obtained Hc results of different samples reveal that the critical single-domain size of the Co0.8Zn0.2Fe2O4 NF is approximately 44 nm. By doping Zn2+ with different concentrations, the morphologies of Co1-xZnxFe2O4 (0≤ x ≤ 0.5) NFs do not show obvious changes. For magnetic properties, the Ms increases and Hc decreases monotonically, respectively.

Key words: alignment, Co0.8Zn0.2Fe2O4, single-domain, Co1-xZnxFe2O4

中图分类号:  (Ferrimagnetics)

  • 75.50.Gg
75.75.Cd (Fabrication of magnetic nanostructures) 75.75.-c (Magnetic properties of nanostructures) 75.60.-d (Domain effects, magnetization curves, and hysteresis)