Study on Saturation Magnetization Behavior of Sintered NdFeB

To clarify the relationship between the minimum saturation magnetization field strength required for sintered NdFeB magnets and their intrinsic coercivity or saturation polarization in the initial state of magnetic neutrality and magnetized history, three different grades of sintered NdFeB magnets were selected in different initial states. The magnetic dipole moments and the demagnetization curves were measured after magnetizing under different magnetic field strengths. The results show that for sintered NdFeB magnets, only a magnetization field of H_s=2J_s/μ₀ is required to saturate the magnets in the state of magnetic neutrality. For magnets with magnetized history, a magnetization field of H_s=3J_s/μ₀ is required to realize saturation magnetization.