High coercivity in rare-earth-free FeCo nanorods

CMI Highlight:  High coercivity in rare-earth-free FeCo nanorods

CMI researchers at Ames National Laboratory and the University of Texas at Arlington conducted the research for this highlight

M-H loop at 300 K
M-H loop at 300 K

Innovation 

Successful synthesis of the Fe-rich Fe-Co nanorods (~65 at% Fe, ~35 at% Co, BCC structure) with a record-high coercivity (1.8 kOe). 

Achievement 

Size and shape control of FeCo nanorods (aspect ratio 2–6) enable the exploitation of magnetic shape anisotropy, leading to a coercivity of 1.8 kOe and a maximum energy product of 8 MGOe. 

Significance and Impact 

  • The significant coercivity, high magnetization, Curie temperature, high thermal stability make the Fe-Co nanomagnets a promising permanent magnet candidate. 
  • The performance achieved compares with commercially available AlNiCo magnets. 

Hub Goal Addressed 

Accelerated magnet discovery and maturation. 

TEM image at 100 nm scale
TEM image at 100 nm scale