Abstract It is investigated the behavior of the coercivity as function of the temperature in SmCo 2:17 type magnets. These magnets are a 5 element alloy with Sm, Co, Fe, Cu and Zr. The magnets have a peculiar nanostructure, where the nanocrystalline grains of the main ferromagnetic phase - rhomobohedral Sm2(CoFe)17 - are enveloped by a cell boundary Sm(CoCu)5 phase. The samples present different behavior as function of temperature, which is attributed to different copper content inside the Sm(Co,Cu)5 cell boundary phase. It is found that the experimental hysteresis curves of high coercivity magnets can be theoretically described by a mean field Stoner-Wohlfarth model. It is observed a spring effect: When a magnetized sample is exposed to reversal field of the order of −1.5 Tesla, the magnetization returns to near the remanence value. The microstructure that results in high coercivity SmCo 2:17 type magnets is discussed in detail.

中文翻译：

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SmCoCuFeZr 磁铁中的异常矫顽力行为和静磁耦合

摘要 研究了矫顽力随温度变化的 SmCo 2:17 型磁体的行为。这些磁铁是含有 Sm、Co、Fe、Cu 和 Zr 的 5 元素合金。磁铁具有特殊的纳米结构，其中主要铁磁相的纳米晶粒 - 菱形 Sm2(CoFe)17 - 被晶胞边界 Sm(CoCu)5 相包围。样品表现出作为温度函数的不同行为，这归因于 Sm(Co,Cu)5 晶胞边界相内的不同铜含量。发现高矫顽力磁体的实验磁滞曲线可以用平均场Stoner-Wohlfarth模型在理论上描述。观察到弹簧效应：当磁化样品暴露于 -1.5 特斯拉数量级的反向场时，磁化强度恢复到剩磁值附近。