The magnetization reversal behaviour for SmCo6.8Zr0.2 and SmCo6.8Zr0.2/α-(Fe,Co) nanocrystalline magnets at low temperature |
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引用本文: | 刘壮,陈仁杰,李东,闫阿儒.The magnetization reversal behaviour for SmCo6.8Zr0.2 and SmCo6.8Zr0.2/α-(Fe,Co) nanocrystalline magnets at low temperature[J].中国物理 B,2010,19(6):67504-067504. |
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作者姓名: | 刘壮 陈仁杰 李东 闫阿儒 |
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作者单位: | Zhejiang Province Key Laboratory of Magnetic Materials and
Application Technology, Ningbo Institute of Material Technology $\&$
Engineering, Chinese Academy of Sciences, Ningbo 315201,
China;Institute of Solid State Physics, Chinese Academy of Sciences,;Zhejiang Province Key Laboratory of Magnetic Materials and
Application Technology, Ningbo Institute of Material Technology $\&$
Engineering, Chinese Academy of Sciences, Ningbo 315201,
China;Zhejiang Province Key Laboratory of Magnetic Materials and
Application Technology, Ningbo Institute of Material Technology $\&$
Engineering, Chinese Academy of Sciences, Ningbo 315201,
China;Zhejiang Province Key Laboratory of Magnetic Materials and
Application Technology, Ningbo Institute of Material Technology $\&$
Engineering, Chinese Academy of Sciences, Ningbo 315201,
China |
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基金项目: | Project supported by the Natural
Science Foundation of Zhejiang Province of China (Grant
No.~Y407174), Major Scientific and Technological Special Fund of
Zhejiang Province of China (Grant No.~2007C11046) and the National
Basic Research Program of China (G |
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摘 要: | This paper reports that the SmCo 6.8 Zr 0.2 nanocrystalline permanent magnets and SmCo 6.8 Zr 0.2 /α-(Fe,Co) nanocomposite permanent magnets are successfully produced by mechanical alloying and subsequently annealing at 700 C for 10 minutes.The x-ray diffraction results show that the phase structure of SmCo 6.8 Zr 0.2 nanocrystalline permanent magnets is composed of SmCo 7 phase and SmCo 6.8 Zr 0.2 /α-(Fe,Co) nanocomposite permanent magnets is composed of SmCo 7 and α-(Fe,Co) phases.The mechanism of magnetization reversal is mainly controlled by inhomogeneous domain wall pinning in SmCo 6.8 Zr 0.2 and SmCo 6.8 Zr 0.2 /α-(Fe,Co) magnets.The inter-grain exchange interaction at low temperature is investigated,which shows that the inter-grain exchange interaction of SmCo 6.8 Zr 0.2 /α-(Fe,Co) magnets increases greatly by the decrease of the measured temperature.According to Δm irr-H/H cj,Δm rev-H/H cj and χ irr-H/H cj curves at room temperature and 100 K,the changes of irreversible and reversible magnetization behaviours of SmCo 6.8 Zr 0.2 and SmCo 6.8 Zr 0.2 /α-(Fe,Co) magnets with the decreasing temperature are analysed in detail.The magnetic viscosity and the activation volume of SmCo 6.8 Zr 0.2 and SmCo 6.8 Zr 0.2 /α-(Fe,Co) magnets at different temperatures are also studied.
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关 键 词: | nanocrystalline magnets coercivity mechanism inter-grain exchange coupling magnetization reversal behaviour |
收稿时间: | 2009-10-09 |
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