A branch connecting two neighboring ferromagnetic α 1 -phase rods is one of the geometric factors that contributes to degradation of alnico's normally high coercivity. This letter investigates the effects of various branch geometries and dimensions on the coercivity of alnico comprehensively by using a micromagnetic simulator when the branch is assumed to be connected in either H- or U-shaped alnico structure and the magnetization reversal of the ferromagnetic α 1 -phase rod occurs by quasi-coherent rotation or curling. For the H-shaped structure, high coercivity is realized by adopting the middle-branch-connected (MBC) structure with a long branch length and width for quasi-coherent rotation, regardless of the branch thickness. For curling, the same geometric parameters are suggested except for a thick branch thickness. For the U-shaped structure with quasi-coherent rotation, a short branch thickness, width, and length, and MBC position lead a high coercivity. For curling, a short branch width but long length and edge-bridge-connected position result in a high coercivity, regardless of the branch thickness.

中文翻译：

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铝镍钴磁体矫顽力的微磁模拟


连接两个相邻铁磁α 1 相棒的分支是导致铝镍钴合金通常高矫顽力退化的几何因素之一。本文通过使用微磁模拟器，全面研究了当假设分支以 H 形或 U 形铝镍钴结构连接时，不同分支几何形状和尺寸对铝镍钴矫顽力的影响以及铁磁体 α 1 - 的磁化反转。相位杆通过准相干旋转或卷曲发生。对于H形结构，通过采用具有长分支长度和宽度的中间分支连接（MBC）结构来实现准相干旋转，而不管分支厚度如何。对于卷曲，建议使用相同的几何参数，除了粗的分支厚度。对于准相干旋转的U形结构，较短的分支厚度、宽度和长度以及MBC位置导致较高的矫顽力。对于卷曲，无论分支厚度如何，短分支宽度但长长度和边缘桥连接位置都会导致高矫顽力。