Hysteresis and Magnetization Reversal

Static and dynamic micromagnetic modeling provided useful information for understanding domain formation and the switching mechanisms in polycrystalline nanostructured materials. The micromagnetic simulations confirm that the polycrystalline microstructure influences these mechanisms, leading to different remanence and coercivity of the hysteresis loop. By controlling the microstructure, different shape hysteresis loops can be obtained, i.e., different magnetic properties can be designed according to the requirement of the application. The texture (distribution of anisotropy directions of individual magnetic grains) also significantly affects the morphology and dynamics of reverse domains. For example, the hysteresis loop normally is round for a textured sample (with unique anisotropy direction) and may have steps (Barkhausen jumps) for an untextured one (with distribution of easy axes directions).

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