Ce-substituted SmCo5 retains huge magnetic anisotropy

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Easy and hard axes magnetization for single crystals of the new Ce/Sm/Co/Cu material and their extrapolations to crossing record-high Ha = ~30 T. The upper insert - general appearance of the single crystals, the lower insert - literature data, Ha for single crystal of SmCo5 (Strnat, 1988).
Easy and hard axes magnetization for single crystals of the new Ce/Sm/Co/Cu material and their extrapolations to crossing record-high Ha = ~30 T. The upper insert - general appearance of the single crystals, the lower insert - literature data, Ha for single crystal of SmCo5 (Strnat, 1988).

CMI researchers at Ames Laboratory conducted the research for this highlight

Achievement
Discovery of new Ce-based ferromagnet with huge anisotropy field Ha = ~30 T.

Significance and Impact
Substitution of relatively scarce Sm by abundant, inexpensive Ce shows utility of Cerium for permanent magnet applications while keeping most important effect of Sm – large magnetic anisotropy.

Details and next steps

Material contains 50% less Sm and 20% less Co than SmCo5, along with Cu substitution. 

Easy and hard axis magnetizations were measured up to 9 T and extrapolated to their crossing point of ~30 T. The results were compared to similar single crystal measurements for SmCo5 (Figure, lower insert).

Future steps include polycrystalline work evaluating its structural, electronic and thermal characteristics, and developing coercivity.