Hard magnetic property improvement of melt-spun PrCo5 ribbons by Fe and C Doping

H. W. Chang, H. Y. Wang, Y. I. Lee, C. W. Shih, W. C. Chang, C. C. Yang, C. C. Shaw

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2 Scopus citations


Magnetic properties and microstructure of melt-spun PrCo5-x-yFexCy (x = 0 and 0.3; y = 0-0.3) ribbons are studied. For PrCo5 ribbons spun at lower wheel speed of 20 m/s, the coexistence of 2:17 phase with magnetic hard 1:5 phase leads to low coercivity of 0.6 kOe. Increasing wheel speed to 40 m/s imroves the coercivity to 3.3 kOe due to the increased volume fraction of 1:5 phase. Interestingly, magnetic properties of PrCo5 ribbons melt spun at 40 m/s (Br = 6.4 kG, iHc = 3.3 kOe, and (BH)max = 4.5 MGOe) are improved to Br = 6.1-6.5 kG, iHc = 7.8-13.5 kOe, (BH)max = 7.3-8.9 MGOe by doping C, and significantly enhanced to Br = 6.3 kG, iHc = 16.1 kOe, and (BH)max = 9.3 MGOe for C and Fe co-doped PrCo4.6Fe0.3C0.1 ribbons. The structural and thermo-magnetic analysis confirms that the entrance of Fe and part of C into the crystal structure of 1:5 phase leads to the increase of Curie temperature. Doping proper C content not only uniformly refines grain size and, therefore, improves the squareness of demagnetization curve and (BH)max, but also increases the volume fraction of 1:5 phase, and thus enhances the coercivity. The increased volume fraction of 1:5 phase and the reduced magnetic domain size due to refined microstructure by co-doping Fe and C make PrCo4.6Fe0.3C0.1 ribbons exhibit a high permanent magnetic performance. They are promising candidate materials for making bonded magnets.

Original languageEnglish
Article number8386788
JournalIEEE Transactions on Magnetics
Issue number11
StatePublished - Nov 2018


  • Fe and C doping effect
  • melt-spun PrCo ribbon
  • permanent magnetic materials


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