Coercivity of isotropic nanocrystalline Pr12Fe82B6 ribbons

Coercivity of isotropic nanocrystalline Pr12Fe82B6 ribbons
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各向同性纳米晶 Pr12Fe82B6 薄带的矫顽力

DOI:
10.1103/physrevb.66.184436
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发表时间:
2002-11
期刊:
Phys. Rev
影响因子:
--
通讯作者:
张宏伟,荣传兵,张 健,张绍英,沈保根
张宏伟,荣传兵,张 健,张绍英,沈保根
中科院分区:
其他
文献类型:
--
作者:
张宏伟,荣传兵,张 健,张绍英,沈保根

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通过对各向同性纳米晶Pr-Fe-B薄带的磁化率、初始磁化曲线、磁滞回线和热激活的温度依赖性研究了磁化反转现象。发现双折射机制随温度而变化。在20 K时,矫顽力主要由强钉扎(由随机不均匀性)决定;而在室温下,它主要由畴的成核和晶界的局部钉扎控制。研究了晶界特性对磁硬化的影响以及晶间交换耦合和各向异性的温度依赖性,讨论了磁硬化机制。
The magnetization reversal has been examined by the temperature dependence of the coercivity, the initial magnetization curve, minor hysteresis loops, and thermal activation in isotropic nanocrystalline Pr-Fe-B ribbons. The coercivity mechanism is found to vary with temperature. At 20 K, the coercivity is mainly determined by strong pinning (by random inhomogeneities); while at room temperature it is mainly controlled by the nucleation of domain and localized pinning at grain boundaries. The influence of the grain-boundary character on magnetic hardening and the temperature dependence of intergrain exchange coupling and anisotropy have been investigated to discuss the coercivity mechanism.
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