New hard CeFe12-based ferromagnet without critical elements

line graph - anisotropic magnetization measurements of the W-stabilized (Ce,Sm)Fe12 material showing the Ha ~ 8 T
Anisotropic magnetization measurements of the W-stabilized (Ce,Sm)Fe12 material showing the Ha ~ 8 T

CMI researchers from Ames National Laboratory conducted the activity for this highlight

Innovation   
Novel cerium-iron-based magnets for U.S. national needs.

Achievement

  • Development of new critical-element-free Fe-rich alloy with intrinsic magnetic properties sufficient for development of high-energy permanent magnet, i.e., Ha > 8 T, Ms > 12 kG, Tc > 500 K.
  • Small Sm doping (< 10 wt.%) of W-stabilized CeFe12 bulk alloys facilitates strong uniaxial magnetocrystalline anisotropy.

Significance and Impact  
Novel critical-element-free permanent magnet material that consists of ~75 wt.% Fe and uses domestic earth-abundant, inexpensive Ce.

Hub Target Addressed   
Accelerated magnet discovery and maturation.  
 

line graph – Rietveld refinement of the bulk homogenized alloy containing ~ 90 % of the hard magnetic matrix - 1:12-type tetragonal phase.
Rietveld refinement of the bulk homogenized alloy containing ~ 90 % of the hard magnetic matrix - 1:12-type tetragonal phase.