Toward Maximum Utilization of Heavy Rare Earths in Sintered Nd–Fe–B Magnets by Grain Boundary Diffusion Source and Application Area Optimization
Editor’s Choice in Advanced Engineering Materials
2025/09/29
Our work Toward Maximum Utilization of Heavy Rare Earths in Sintered Nd–Fe–B Magnets by Grain Boundary Diffusion Source and Application Area Optimizationhas been published in Advanced Engineering Materials.
Reduction of resource critical heavy rare earth elements such as Dy and Tb in NdFeB-based magnets is crucial for cost-effective coercivity enhancement at the high operating temperature in E-motors. In this work, highly efficient Tb utilization with a coercivity increase of 3866 kA/m/wt% Tb (4.86 T/wt% Tb) is achieved with only a minor reduction in remanence. Using FE magnetostatics simulation on an internal permanent magnet synchronous traction motor for EVs, we could show that the level of demagnetization is not distributed homogenously, with the highest demagnetization occurring at the edges and corners of the inner magnets. This interdisciplinary work is paving the way toward HRE-balanced high-performance magnets for sustainable electric motor applications.
A. Durgun, D. Ohmer, M. Katter, A. Thul, S. Steentjes, H.S. Amin, O. Gutfleisch, I. Dirba,
Adv. Eng. Mater. 2501145 (2025).
