Ce-based magnet with (BH)max of 18+ MGOe

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CMI researchers at Ames Laboratory conducted the research for this highlight

Achievement
Ce-based gap magnet with energy product (BH)max. 18 – 18.7 MGOe, with large coercivities of 6.0 kOe and remanence approaching 10 kG. 

Significance and Impact

Magnet is viable lower-cost competitor to SmCo magnets at lower Co content (43 wt.% vs. 53+%) using earth-abundant, inexpensive, industrial grade Cerium. 

Details and next steps

  • Co content is decreased from 48 to 43 wt.% by use of Ce/Sm 80:20 ratio instead of 100% Ce
  • Thermal optimization of the gap magnet reveals high sensitivity of magnetic characteristics to cooling rates during the heat treatment (see Figure).
  • Theoretical performance limit for 10 kG remanence is 25 MG-Oe – room for further optimization. 
  • Next steps include comprehensive microstructural and thermal characterization of the system.
Magnetic properties of the 18 MGOe+ Ce-based gap magnet with upper part emphasizing the best characteristics achieved and lower part - high sensitivity of magnetic characteristics to cooing rate.
Magnetic properties of the 18 MGOe+ Ce-based gap magnet with upper part emphasizing the best characteristics achieved and lower part - high sensitivity of magnetic characteristics to cooing rate.