The effect of multi-scale Cu distribution regulation on magnetic properties of Sm(CoFeCuZr)_z magnets

摘要

Correlation between Cu distribution and magnetic properties was studied for Sm(Co_(bal)Fe_(0.28)Cu_(0.07)Zr_(0.02))_(7.6) magnets prepared by conventional powder metallurgical techniques. It reveals that the micrometer scale Cu distribution homogeneity before aging treatment has a profound influence on the cell structure, nanometer scale Cu distribution, which determines the magnetization and demagnetization behavior as well as magnetic properties of the magnets. By tuning the solution treatment conditions, magnet with optimal magnetic properties (remanence of 11.5 kG, coercivity of 23.4 kOe, and maximum energy product of 30.3 MGOe) was prepared.