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研究了铸造/热压 r_(19)Fe_(74.5)B_5Cu_(1.5)永磁体的磁硬化特点.发现磁体反磁化过程受反向畴的形核控制.矫顽力与晶粒尺寸的对数存在线性关系: _iH_c(MA/m)=1.7312—0.4816Ind(μm)根据反向畴形核的随机性和矫顽力的统计特性讨论了该式的物理意义。
The magnetic hardening characteristics of cast / hot-pressed r_ (19) Fe_ (74.5) B_5Cu_ (1.5) permanent magnets were investigated. It was found that the magnetization reversal of the magnets was controlled by the nucleation of the opposite domains. The logarithm of coercivity and grain size Linear relationship: _iH_c (MA / m) = 1.7312-0.4816Ind (μm) The physical meaning of the formula is discussed based on the statistical properties of the randomness and coercivity of the inverted core.