Abstract
Abstract The effect of grain boundary area on the magnetization behaviors in Sm25Co48Fe20Cu5Zr2 magnet was investigated. Grain boundary area with deficiency of Cu and incomplete cellular microstructure was clearly observed. In-situ Kerr observation revealed that the magnetization reversals firstly occurred in the grain boundary areas and then propagated into the interiors of grain. The grain boundary areas with weakened pinning force of magnetic domain walls could undermine the coercivity and induce inferior squareness of the magnet. The investigation using Fresnel LTEM demonstrated that the grain boundary area was magnetized more easily than the grain interior, which agreed with the multi-stage phenomenon of the initial magnetization curve of the magnet.
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