Current Applied Physics

Korean Physical Society (한국물리학회)
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Fabrication and magnetic properties of hexagonal BaFe12O19 ferrite obtained by magnetic-field-assisted hydrothermal process

  • Zhang, Min (School of Physics and Electronics Information, Huaibei Normal University) ;
  • Dai, Jianming (Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences) ;
  • Liu, Qiangchun (School of Physics and Electronics Information, Huaibei Normal University) ;
  • Li, Qiang (School of Physics and Electronics Information, Huaibei Normal University) ;
  • Zi, Zhenfa (Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences)
  • Received : 2018.05.21
  • Accepted : 2018.08.13
  • Published : 2018.11.30
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Abstract

High magnetic field effects on the microstructure and magnetic properties of $BaFe_{12}O_{19}$ hexaferrites synthesized hydrothermal method have been investigated. The obtained results indicate that the lattice constant decreases gradually as the magnetic field strength increases, which may be attributed to the lattice distortion resulted from the high magnetic field. Polycrystalline $BaFe_{12}O_{19}$ samples prepared under magnetic field strength at zero and 5 T are single phase. It is found that application of external magnetic field during synthesis can induce orientated growth of the hexaferrite crystals along the easy magnetic axis. The magnetic properties can be effectively regulated by an application of high magnetic fields. It is observed that the $BaFe_{12}O_{19}$ prepared under a 5 T magnetic field exhibits a higher room-temperature saturation magnetization (66.3 emu/g) than that of the sample (43.6 emu/g) obtained without magnetic field. The results can be explained as the enhanced crystalline, improvement of $Fe^{3+}$ ions occupancy and the oriented growth induced by the external magnetic field. The growing orientation of particles gives rise to increased coercivity due to the enhancement in shape anisotropy. It is expected that an application of magnetic field during the formation of magnetic nanoparticles could be a promising technique to modify magnetic properties with excellent performance.

Keywords

Acknowledgement

Supported by : National Nature Science Foundation of China, Foundation of Educational Commission of Anhui Province

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