Magnetic viscosity and coercivity analysis in nanocrystalline Sm 2 Fe 15 Si 2 C ribbons
Magnetic viscosity and coercivity analysis in nanocrystalline Sm 2 Fe 15 Si 2 C ribbons
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DOI：
10.1103/physrevb.62.8642
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发表时间：
2000-10
影响因子：
3.7
通讯作者：
Hong-wei Zhang;Shao-ying Zhang;B. Shen
中科院分区：
文献类型：
--
作者：
Hong-wei Zhang;Shao-ying Zhang;B. Shen
用SQUID测量了Sm2Fe15Si2C纳米晶带在50 K至室温范围内的磁性黏度系数S、磁化率和反冲曲线。研究发现，强晶间交换耦合对纳米晶Sm2Fe15Si2C中S和热活化体积的影响不容忽视，尤其是在高温下。根据两种现象学模型分析了热波动场H-f与矫顽力的关系。矫顽力的形成机制主要受非均匀钉钉控制，而非纯反畴形核控制。
The magnetic viscosity coefficient S, susceptibility and recoil curves were measured by SQUID For nanocrystalline Sm2Fe15Si2C ribbons at temperatures ranging from 50 K to room temperature. It was found that the effect of strong intergrain exchange coupling on S and thermal activation volume in nanocrystalline Sm2Fe15Si2C can no longer be neglected, especially at high temperature. The relation between thermal fluctuation field H-f and coercivity was analyzed according to two phenomenological models. The mechanism of coercivity was mainly controlled by inhomogeneous pinning rather than a pure nucleation of reverse domain.