Understanding of magnetization reversal mechanism of precipitation-hardening samarium-cobalt magnets from micromagnetic simulation.

This article focuses on the magnetization reversal mechanisms in precipitation-hardening samarium-cobalt (Sm-Co) magnets, specifically examining the pinning-controlled behavior at the interface between the 1:5 (Sm(Co,Cu)5) and 2:17 (Sm2(Co,Fe)17) phases. Using micromagnetic simulations, the study reveals that modifying the interface orientation from parallel to tilted relative to the magnetic easy axis leads to the emergence of quasi-repulsive and quasi-attractive pinning modes, in addition to the traditionally recognized repulsive and attractive pinning. These intermediate pinning modes occur when the domain wall energy densities of the two phases are relatively close, highlighting the significant influence of interface orientation on pinning behavior. The findings contribute to a deeper understanding of coercivity in Sm-Co magnets and offer insights applicable to other nanostructured permanent magnet materials.