Grain-size effect on coercivity of Nd–Fe–B nanomagnets: micromagnetics simulation based on a multi-grain model

作者：Lingbo Bao, Guohong Yun, Narsu Bai, Yongjun Cao · 发表于：Applied Physics Express · 年份：2021 · DOI：10.35848/1882-0786/ac14d9 · 被引用次数：10 · 研究领域：Magnetic Properties of Alloys、Magnetic properties of thin films、Magnetic Properties and Applications

The coercivity ( H c ) of nanocrystalline Nd–Fe–B magnet was simulated by multi-grain models in combination with hybrid Monte Carlo method. The simulated grain size dependence of H c with grain boundary (GB) model reproduces the available experiment nicely. The H c of direct contact (DC) model increase with the decreasing grain size ( S G ). This fact suggests that the H c of Nd–Fe–B magnets can be further increased by grain refinement even though the average S G down to several tens of nanometers. The difference of coercivity mechanism between GB-model and DC-model was understood by magnetization reversal analysis.