CMI Project 2.1.14: Reduced rare earth content high performance magnets Research Highlights

Ce-substituted SmCo5 retains huge magnetic anisotropy

CMI researchers at Ames Laboratory conducted the research for this highlight

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).

Potential 20+ MGOe Ce-based Co-lean magnet

CMI researchers at Ames Laboratory grew a single crystalline material with high magnetic properties at high temperature

Intrinsic properties of the 1:7-type Zr-doped Co-lean Ce-magnet in comparison with similar 2:17- and 1:5-matrials. The 1:7-type material is the middle point that allows potential energy products of Ce-magnets > 20 MGOe, by coupling high Ms of 2:17 with high Ha of 1:5.

Potential Alnico-surpassing gap magnet

CMI researchers at Iowa State University, Ames Laboratory and UC-Davis collaborated with researchers at the University of Nebraska at Lincoln for this highlight on a potential Alnico-surpassing gap magnet

Easy and hard-axis magnetic field sweeps in (Fe1-xCox)2B, x= 0.3, depicting a significant uniaxial anisotropy field of 0.6 Tesla. Anisotropy field at 500 K (not shown) essentially unchanged.

Critical materials periodic table

CMI research produced a Critical Materials Periodic Table. Every element includes market pricing, supplier information, U.S. import reliance, and crustal abundance.

Ce-based gap magnets match high-temperature performance of neo

CMI research at Ames Laboratory Achievement showed that at certain temperatures a cerium-based magnet matches the energy product of and exceeds the coercivity of neodymium permanent magnets

High performance magnet: Refractory metal and Fe-alloyed Ce2Co17

CMI research at Oak Ridge National Laboratory used first principles calculations to find large uniaxial magnetic anisotropy with magnetizations

Lower-cost commercial grade Ce enhances performance and reduces cost in gap magnets

CMI research with lower-cost commercial grade cerium enhances performance and reduces cost in gap magnets. Also, the less costly “dirty” cerium samples showed as much as a 5% increase of both coercivity and magnetization, resulting in better energy product.

Discovery of the large coercivity CeCo5 – CeZn5 system

CMI researchers discover the large coercivity CeCo5 – CeZn5 system

Development of a new rare earth-free permanent magnet based on Sb-doped Fe3Sn

CMI research on development of a new rare earth-free permanent magnet based on Sb-doped Fe3Sn

The 15 MGOe gap magnet without critical rare earths

CMI researchers create the 15 MGOe gap magnet without critical rare earths