Improved coercivity and considerable saturation magnetization of cobalt ferrite (CoFe2O4) nanoribbons synthesized by electrospinning

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• 作者：Panpan Jing ; Jinlu Du ; Chendong Jin ; Jianbo Wang…
• 刊名：Journal of Materials Science
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：51
• 期：2
• 页码：885-892
• 全文大小：1,688 KB
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• 作者单位：Panpan Jing (1)
  Jinlu Du (1)
  Chendong Jin (1)
  Jianbo Wang (1) (2)
  Lining Pan (1)
  Jianan Li (1)
  Qingfang Liu (1)
  
  1. Key Laboratory for Magnetism and Magnetic Materials of Ministry of Education, Lanzhou University, Lanzhou, 730000, People鈥檚 Republic of China
  2. Key Laboratory of Special Function Materials and Structure Design of the Ministry of Education, Lanzhou University, Lanzhou, 730000, People鈥檚 Republic of China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Characterization and Evaluation Materials
  Polymer Sciences
  Continuum Mechanics and Mechanics of Materials
  Crystallography
  Mechanics
  
• 出版者：Springer Netherlands
• ISSN：1573-4803

文摘

Cobalt ferrite (CoFe₂O₄) nanoribbons with high crystallinity and purity were synthesized by annealing the as-spun PVP/[Co(NO₃)₂+Fe(NO₃)₃] precursor nanoribbons at temperatures from 450 to 750 掳C in air, and they were certified to have an improved coercivity (H _c) and considerable saturation magnetization (M _s). Although all the prepared CoFe₂O₄ nanoribbons presented an excellent ferromagnetism behavior at room temperature, their M _s progressively increased with increasing annealing temperature but H _c followed an opposite variation tendency. The maximum M _s of about 80.3 emu g鈭? of the nanoribbons annealed at 750 掳C was basically equal to the bulk value, and the maximum H _c of about 1802 Oe of the nanoribbons annealed at 450 掳C, is larger than most of reported H _c values of other one-dimensional CoFe₂O₄ nanostructures by far. It suggested that the magnetization reverse processes of the CoFe₂O₄ nanoribbons annealed at 450 and 550 掳C were dominated by the coherent rotation model, while that of the CoFe₂O₄ nanoribbons annealed at 650 and 750 掳C were dominated by the growth of a reverse magnetic domain.