The grains initiating magnetization reversal in the microstructure of a hot-deformed permanent magnet have been identified in this study by performing micromagnetic simulations based on the Landau–Lifshitz–Gilbert equation. Hot-deformed permanent magnets comprise tabular grains, the easy-axis orientations of which are inclined with respect to the nominal easy axis of the permanent magnet. In the simulation model, the grains complexly overlap, similar to in actual permanent magnets. We analyze the simulation results considering grain overlap and the easy-axis tilt angles of the grains. The initiation of magnetic nucleation requires a high concentration of grains with large easy-axis tilt angles. We clarify the magnetic-nucleation process and provide a method to enhance the performance of permanent magnets by avoiding a high concentration of grains with large easy-axis tilt angles.

通过基于Landau–Lifshitz–Gilbert方程的微磁模拟，在本研究中确定了热变形永磁体的微观结构中引起磁化反转的晶粒。热变形的永磁体包括板状晶粒，其易轴取向相对于永磁体的标称易轴倾斜。在模拟模型中，晶粒复杂地重叠，类似于实际的永磁体。我们分析了考虑晶粒重叠和晶粒易轴倾斜角的模拟结果。磁核化的开始需要高浓度的大易轴倾斜角晶粒。