A study on the exchange coupling of NdFeB-type nanocomposites using Henkel plots
A study on the exchange coupling of NdFeB-type nanocomposites using Henkel plots
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DOI：
10.1063/1.369913
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发表时间：
1999-04
影响因子：
3.2
通讯作者：
Q. Chen;B. Ma;B. Lu;M. Huang;D. Laughlin
中科院分区：
文献类型：
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作者：
Q. Chen;B. Ma;B. Lu;M. Huang;D. Laughlin
采用热磁分析、振动样品磁强计、x射线衍射和常规透射电镜等方法研究了（Nd0.95La0.05）9.5FebalCo5Nb2B10.5纳米复合材料的相变和磁性能。汉高图用于量化纺丝和热处理样品中硬磁相和软磁相之间交换耦合的强度。结果表明，残余Br、矫顽力Hci和最大能积BHmax受磁相的存在以及组成相的晶粒尺寸和分布的影响。汉高图成功地解释了在750℃以下处理的样品中，交换偶联对Br、Hci和BHmax的影响。然而，对于750°C以上处理的样品，它变得不合适。虽然在汉高图中得到了相似形状的ΔM-H曲线，但当热处理温度为10℃时，Br、Hci和BHmax发生了严重的降解。
The phase transformation and magnetic properties of (Nd0.95La0.05)9.5FebalCo5Nb2B10.5 nanocomposite have been investigated systematically via thermomagnetic analysis, vibration sample magnetometer, x-ray diffraction, and conventional transmission electron microscopy. The Henkel plot was employed to quantify the strength of the exchange coupling between the hard and soft magnetic phases in the as-spun and the thermally treated samples. It was found that remanence Br, coercivity Hci, and maximum energy product BHmax obtained were affected by the magnetic phases present as well as the grain size of constituent phases and their distribution. The Henkel plot successfully interpreted the effect of the exchange coupling on Br, Hci, and BHmax obtained for samples treated below 750 °C. However, it became inadequate for samples treated above 750 °C. Although similar shapes of ΔM–H curves were obtained in the Henkel plot, severe degradation in Br, Hci, and BHmax was found when the thermal treatment temperature was i...