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Coercivity degradation caused by inhomogeneous grain boundaries in sintered Nd-Fe-B permanent magnets

Journal Article


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Abstract


  • Quantitative correlation between intrinsic coercivity and grain boundaries in three dimensions is critical to

    further improve the performance of sintered Nd-Fe-B permanent magnets. Here, we quantitatively reveal the

    local composition variation across and especially along grain boundaries using the powerful atomic-scale analysis

    technique known as atom probe tomography. We also estimate the saturation magnetization, magnetocrystalline

    anisotropy constant, and exchange stiffness of the grain boundaries on the basis of the experimentally determined

    structure and composition. Finally, using micromagnetic simulations, we quantify the intrinsic coercivity

    degradation caused by inhomogeneous grain boundaries. This approach can be applied to other magnetic materials

    for the analysis and optimization of magnetic properties.

UOW Authors


  •   Chen, Hansheng (external author)
  •   Yun, Fan (external author)
  •   Qu, Jiangtao (external author)
  •   Li, Yingfei (external author)
  •   Cheng, Zhenxiang
  •   Fang, Ruhao (external author)
  •   Ye, Zhixiao (external author)
  •   Ringer, Simon Peter. (external author)
  •   Zheng, Rongkun (external author)

Publication Date


  • 2018

Citation


  • Chen, H., Yun, F., Qu, J., Li, Y., Cheng, Z., Fang, R., Ye, Z., Ringer, S. P. & Zheng, R. (2018). Coercivity degradation caused by inhomogeneous grain boundaries in sintered Nd-Fe-B permanent magnets. Physical Review Materials, 2 (5), 054404-1-054404-9.

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=4168&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/3118

Start Page


  • 054404-1

End Page


  • 054404-9

Volume


  • 2

Issue


  • 5

Place Of Publication


  • United States

Abstract


  • Quantitative correlation between intrinsic coercivity and grain boundaries in three dimensions is critical to

    further improve the performance of sintered Nd-Fe-B permanent magnets. Here, we quantitatively reveal the

    local composition variation across and especially along grain boundaries using the powerful atomic-scale analysis

    technique known as atom probe tomography. We also estimate the saturation magnetization, magnetocrystalline

    anisotropy constant, and exchange stiffness of the grain boundaries on the basis of the experimentally determined

    structure and composition. Finally, using micromagnetic simulations, we quantify the intrinsic coercivity

    degradation caused by inhomogeneous grain boundaries. This approach can be applied to other magnetic materials

    for the analysis and optimization of magnetic properties.

UOW Authors


  •   Chen, Hansheng (external author)
  •   Yun, Fan (external author)
  •   Qu, Jiangtao (external author)
  •   Li, Yingfei (external author)
  •   Cheng, Zhenxiang
  •   Fang, Ruhao (external author)
  •   Ye, Zhixiao (external author)
  •   Ringer, Simon Peter. (external author)
  •   Zheng, Rongkun (external author)

Publication Date


  • 2018

Citation


  • Chen, H., Yun, F., Qu, J., Li, Y., Cheng, Z., Fang, R., Ye, Z., Ringer, S. P. & Zheng, R. (2018). Coercivity degradation caused by inhomogeneous grain boundaries in sintered Nd-Fe-B permanent magnets. Physical Review Materials, 2 (5), 054404-1-054404-9.

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=4168&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/3118

Start Page


  • 054404-1

End Page


  • 054404-9

Volume


  • 2

Issue


  • 5

Place Of Publication


  • United States