Remanence enhancement and coercivity in two-phase CoPt bulk magnets
Remanence enhancement and coercivity in two-phase CoPt bulk magnets
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DOI：
10.1063/1.1418419
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发表时间：
2001
影响因子：
2.7
通讯作者：
Q. Xiao;E. Bruck;Zhidong Zhang;R. BoerdeF.;K. Buschow
中科院分区：
文献类型：
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作者：
Q. Xiao;E. Bruck;Zhidong Zhang;R. BoerdeF.;K. Buschow
本文研究了原子无序有序转变对铜铜锭剩余物增强和矫顽力的影响。采用x射线衍射法测定了低温硬磁面心四方相（fct）在高温磁软面心立方相（fcc）中的相对析出量。作为退火温度的函数，平均晶粒尺寸和fct相的相对数量增加，但代价是fcc相的减少。这些变化之后是磁测量的方法。我们观察到矫顽力随退火温度的升高而不断增加，最终达到最大值。采用Kneller-Hawig模型解释了剩磁增强的发生和磁性软硬相之间交换耦合程度的不断变化。
We have studied the effect of the atomic disorder–order transformation on remanence enhancement and coercivity in CoPt ingots by isothermal annealing at various temperatures well below the transformation point. The relative amount of the low-temperature hard-magnetic face-centered-tetragonal (fct) phase precipitated in the high-temperature magnetically soft face-centered-cubic (fcc) phase was determined by means of x-ray diffraction. As a function of annealing temperature, the mean grain size and the relative amount of the fct phase increase at the cost of the fcc phase. These changes were followed by means of magnetic measurements. We observed a continuous increase in coercivity with increasing annealing temperature, eventually reaching a maximum. The Kneller–Hawig model was used to explain the occurrence of remanence enhancement and the continuously changing degree of exchange coupling between the magnetically soft and hard phases.