Some coecivity theories based on the different defect models, such as the nucleation theory, the pinning theory, the thermal activation theory, and the starting field theory are briefly reviewed.

• 摘要综述了建立在不同缺陷模型基础上的烧结钕铁硼永磁体矫顽力的成核理论、热激活理论、钉扎理论和发动场理论等；