Change in Magnetic Domain Structure of Nd-Fe-B Sintered Magnets by Compressive Stress
Change in Magnetic Domain Structure of Nd-Fe-B Sintered Magnets by Compressive Stress
复制标题
压应力引起 Nd-Fe-B 烧结磁体磁畴结构的变化
DOI：
10.1002/eej.23058
复制
发表时间：
2018
影响因子：
0.4
通讯作者：
ARAKI TAKESHI
中科院分区：
文献类型：
--
作者：
TAKEZAWA MASAAKI;MORIMOTO YUJI;EJIMA JUN;NAKANO YOSHIKAZU;ARAKI TAKESHI
为了阐明Nd - Fe - B烧结磁体的压缩应力与退磁之间的关系，我们使用Kerr显微镜研究了压缩应力对磁畴结构的影响。对5种Nd - Fe - B烧结磁体的磁畴进行了观察。磁体的矫顽力为0.8 ~ 1.4 MA/m，残余磁通密度为1.3 ~ 1.5 T。施加100 MPa压应力时，具有低矫顽力（0.875 MA/m）和高残余磁通密度（1.41 ~ 1.47 T）的Nd - Fe - B磁体发生不可逆退磁。压缩影响面积约为0.14%。Nd - Fe - B磁体的退磁需要大于50 MPa的应力。不可逆退磁的量取决于压应力的强度以及磁体的剩余磁通和矫顽力。
To clarify the relationship between compressive stresses and demagnetization of Nd‐Fe‐B sintered magnets, we have examined the change in domain configuration by compressive stresses using a Kerr microscope. The magnetic domains of five kinds of Nd‐Fe‐B sintered magnets have been observed. The magnets have a coercivity of 0.8 MA/m to 1.4 MA/m and residual magnetic flux density of 1.3 T to 1.5 T. Irreversible demagnetization of Nd‐Fe‐B magnets with a low coercivity of 0.875 MA/m and high residual magnetic flux density of 1.41 T to 1.47 T have occurred from applying a compressive stress of 100 MPa. The compression‐affected area is approximately 0.14%. The stress more than 50 MPa is needed to demagnetize Nd‐Fe‐B magnets. The amount of irreversible demagnetization depends upon the intensity of the compressive stress as well as the residual magnetic flux and coercive force of the magnets.