Pathway for improved coercivity for La-Nd based magnet 

Alert
Current COVID-19 Community Level: LOW (Updated Dec. 2) CDC COVID-19 County Check
line graph shows three curved lines representing hysteresis loops of (Nd0.75La0.25)2Fe12Co2B samples. R1-HT3: sintered magnet; S1-PrCu-HT3: sintered magnet coated with Pr-Cu powder and heat-treated; S1-PrAlCu-HT3: sintered magnet coated with Pr-Al-Cu powder and heat-treated. 
Hysteresis loops of (Nd0.75La0.25)2Fe12Co2B samples. R1-HT3: sintered magnet; S1-PrCu-HT3: sintered magnet coated with Pr-Cu powder and heat-treated; S1-PrAlCu-HT3: sintered magnet coated with Pr-Al-Cu powder and heat-treated.

CMI researchers at Ames Laboratory conducted the activity for this highlight

Innovation
Coercivity of 12 kOe was achieved in the La-Nd based magnet via diffusion of sintering aid.

Achievement
Large coercivity will ensure resistance to demagnetization for the application of La-Nd magnets. 

Significance and impact

  • Helped advance coercivity beyond the previously reported 9 kOe by better utilization of the under-utilized anisotropy field. 
  • Diffusing non-magnetic Pr-Cu or Pr-Al-Cu into magnets enabled grain boundary engineering for improved coercivity in La-Nd magnet.
  • Inspires search for a more effective coercivity enhancing material. 

Hub Goal Addressed 
Conversion into high value end products; Increase speed of discovery and integration.