The Understanding of Reversed Domain Nucleation and Pinning Mechanism in Hot Deformed Nd2Fe14B Magnets

Hot deformed magnets are prepared following hot pressing the melt spun powders. The microstructures of these magnets are analyzed through a scanning electron microscope. It can be obtained that the shape of the grains in these magnets changes to platelike, however, coarse grains are also observed. The temperature dependence of coercivity is tested by superconducting quantum interference device. The dependence of H_C/M_S on H_A/M_S in the hot deformed magnets, which is achieved by the temperature dependence of coercivity is carried out to check the magnetization reversal. The nanostructural parameters that are related to different nanostructural effects are also obtained from the linear relationship between H_C/M_S and H_A/M_S. Minor loops of the hot deformed magnets are measured to analyze the magnetization behaviors. The saturation magnetization versus the maximum applied field of the hot deformed magnets is also carried out. In this paper, it is believed that the reversal domain propagation and pinning effect are both available to explain the magnetization behavior in this investigation.