Abnormal temperature dependence of intrinsic coercivity in Sm(Co, Fe, Cu, Zr)z powder materials
Abnormal temperature dependence of intrinsic coercivity in Sm(Co, Fe, Cu, Zr)z powder materials
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DOI：
10.1063/1.122659
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发表时间：
1998-11
影响因子：
4
通讯作者：
J. Liu;T. Chui;D. Dimitrov;G. Hadjipanayis
中科院分区：
文献类型：
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作者：
J. Liu;T. Chui;D. Dimitrov;G. Hadjipanayis
当Cu含量x = 0.048时，Sm（CobalCuxFe 0.1Zr 0.033）z粉末材料的本征矫顽力Hci随温度的升高而增大，当Cu含量x ≥ 0.068时，本征矫顽力Hci随温度的升高而减小。在具有各种比率z的一系列样品中发现了这种也是可逆的异常行为。场的依赖性的固有磁化率表明，粘结磁体完全饱和与施加的磁场为20千奥斯特。暴露于更高的温度没有改变室温下的结晶度值。这表明在573~773K的测量过程中，显微结构没有发生变化。研究发现，这种反常的温度行为是由结晶机制的改变引起的。MonteCarlo模拟结果表明，排斥（吸引）胞边界的非线性度随温度的升高而增大（减小），这与实验结果一致。
The intrinsic coercivity Hci in Sm(CobalCuxFe0.1Zr0.033)z powder materials was found to increase with increasing temperature when Cu content x=0.048, but to decrease when Cu content x⩾0.068. This abnormal behavior, which is also reversible, was found in a series of samples with various ratios z. The field dependence of the intrinsic coercivity suggests that the bonded magnets were fully saturated with an applied field of 20 kOe. The exposure to higher temperatures did not change the room temperature value of coercivity. This indicates that the microstructure does not change during the measurement from 573 to 773 K. The change of coercivity mechanism was found to be responsible for this abnormal temperature behavior. Monte Carlo simulation showed that the coercivity increases (decreases) with increasing temperature for the repulsive (attractive) cell boundary, which is consistent with the experimental results.