The precipitation-hardened Sm-Co permanent magnets relied on the pinning of nanocellular structures to achieve high coercivity, and have an irreplaceable position in high-temperature applications. In this article, by employing micromagnetic simulations and magnetic domain observations, the pinning behavior of lamellar phases (Z-phase) were investigated, which has not been well understood before. The results showed that the Z-phase can serve as a strong pinning position, but due to the parallel lamellar distribution, the magnetic domain walls can move around. Additionally, the effect of Z-phase on coercivity was achieved by changing the morphology of magnetic domain walls during magnetization reversal. For attractive pinning, the coercivity was reduced by the Z-phase, while for repulsive pinning, the Z-phase increased the coercivity when γ_Z＜0.54γ_H. Our findings can provide a novel understanding of the coercivity mechanism of precipitation-hardened Sm-Co permanent magnets.

中文翻译：

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层状富Zr相及其对Sm（CoFeCuZr）z磁体矫顽力的影响


沉淀硬化的 Sm-Co 永磁体依靠纳米蜂窝结构的固定来实现高矫顽力，并在高温应用中具有不可替代的地位。本文通过微磁模拟和磁畴观测，研究了层状相（Z 相）的钉扎行为，这在以前没有得到很好的理解。结果表明，Z 相可以作为强固定位置，但由于平行的层状分布，磁畴壁可以四处移动。此外，Z 相对矫顽力的影响是通过在磁化反转过程中改变磁畴壁的形态来实现的。对于吸引钉扎，Z 相降低了矫�矫�力，而对于排斥钉扎，Z 相在_Z<0.54γ_H γ时增加了矫顽力。我们的研究结果可以为沉淀硬化 Sm-Co 永磁体的矫顽力机制提供新的理解。