Abstract The abnormal temperature characteristics of Hc in Alnico 8 alloys with thermomagnetic heat-treatment conditions are obtained at high temperature. The transmission electron microscopy (TEM) and Lorentz Fresnel images show that the a1 is the finite-nonlinear-dispersed magnetic nanoarray in spatial distribution. The angle dependence curves indicate the easy magnetization direction is still paralleled with the direction of columnar crystal growth and the magnetization reversal model is the incoherent rotation. Meanwhile the high temperature improves the magnetization reversal model from 30 °C to 240 °C and make it nearly steady above 240 °C. The reversal/irreversal reduced curves further reveal that improved magnetization reversal model makes a great effect on the magnetization reversal process. The B-H data and theoretical analysis illuminate that abnormal temperature characteristics of Hc from 30 °C to 240 °C primarily originates from the stronger effect of the improved magnetization reversal model.

中文翻译：

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Alnico 8合金矫顽力异常温度特性研究

摘要 获得了热磁热处理条件下Alnico 8合金在高温下Hc的异常温度特性。透射电子显微镜 (TEM) 和洛伦兹菲涅耳图像显示 a1 是空间分布上的有限非线性分散磁性纳米阵列。角度相关曲线表明易磁化方向仍与柱状晶体生长方向平行，磁化反转模型为非相干旋转。同时高温将磁化反转模型从 30°C 提高到 240°C，使其在 240°C 以上几乎稳定。反转/不反转减少曲线进一步表明改进的磁化反转模型对磁化反转过程产生了很大影响。