Coercivity of Nd‐Ce‐Fe‐B magnets with different anisotropy and magnetostatic field distributions

Abstract This research delves into controlling the interplay of magnetostatic field and anisotropy field via controlled composition distribution, thereby boosting coercivity in Nd‐Ce‐Fe‐B magnets. As the originally heterogeneous compositions gradually homogenize within the magnet, an interesting trend in coercivity emerges. Initially, coercivity shows a positive trend, increasing as the components start to blend. However, after reaching an optimal point, it begins to decline. Notably, coercivity peaks once the element Ce permeates to the magnet’s surfaces. This phenomenon is closely associated with changes in the H crit distribution. H crit is a measure that reflects the interaction between anisotropy field and magnetostatic field. When the composition becomes more uniform, the distribution of H crit shifts, and its minimum absolute value varies. These changes are driven by the combined influence of anisotropy field and magnetostatic field. Understanding these relationships provides valuable insights. It opens up new avenues for enhancing coercivity in Nd‐Ce‐Fe‐B magnets by adjusting and fine‐tuning the interactions between these fields.