Fe substitution into SmCo5 for enhanced magnetic performance

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Crystal structure of transition metal site substituted SmCo5. 1a, 2a and 3g sites are occupied by Sm, Co, and Fe, respectively for SmCo2Fe3.
Crystal structure of transition metal site substituted SmCo5. 1a, 2a and 3g sites are occupied by Sm, Co, and Fe, respectively for SmCo2Fe3. 

CMI researchers at Ames Laboratory conducted the research for this highlight

Achievement
We identify an energetically preferred site in SmCo5 for Fe substitution, increasing magnetization, without reducing magnetic anisotropy. Therefore, if synthesis of SmCo2Fe3 proves successful, this material may outperform SmCo5.

Significance and impact
This achievement may yield a high BHmax, reduced Co high performance magnet, with likely similar operating temperatures and excellent temperature stability. Applications requiring high temperature stability and magnetic performance will have market penetration in the performance range between SmCo5 and Nd2Fe14B.

Details and next steps
First principles all electron electronic structure calculations performed for magnetic characteristics of site substituted SmCo5. Next step is to help experimental scientists to synthesize SmCo2Fe3 providing stability pathways from reaction kinetics and thermodynamics. 
 

Magnetic anisotropy energy vs. orbital moment anisotropy
Magnetic anisotropy energy vs. orbital moment anisotropy