The magnetization reversal behaviour for SmCo6.8Zr0.2 and SmCo6.8Zr0.2/α -(Fe,Co) nanocrystalline magnets at low temperature

doi:10.1088/1674-1056/19/6/067504

中国物理B ›› 2010, Vol. 19 ›› Issue (6): 67504-067504.doi: 10.1088/1674-1056/19/6/067504

The magnetization reversal behaviour for SmCo_6.8Zr_0.2 and SmCo_6.8Zr_0.2/α -(Fe,Co) nanocrystalline magnets at low temperature

陈仁杰¹, 李东¹, 闫阿儒¹, 刘壮²

(1)Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Material Technology \& Engineering, Chinese Academy of Sciences, Ningbo 315201, China; (2)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, He

收稿日期:2009-10-09 出版日期:2010-06-15 发布日期:2010-06-15
基金资助:
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

The magnetization reversal behaviour for SmCo_6.8Zr_0.2 and SmCo_6.8Zr_0.2/$\alpha$ -(Fe,Co) nanocrystalline magnets at low temperature

Liu Zhuang(刘壮)^a)b)†, Chen Ren-Jie(陈仁杰)^a), Li Dong(李东)^a), and Yan Ar-Ru(闫阿儒)^a)

^a Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Material Technology \& Engineering, Chinese Academy of Sciences, Ningbo 315201, China; ^b Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China

Received:2009-10-09 Online:2010-06-15 Published:2010-06-15
Supported by:
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

摘要/Abstract

摘要： This paper reports that the SmCo_6.8Zr_0.2 nanocrystalline permanent magnets and SmCo_6.8Zr_0.2/\al-(Fe,Co) nanocomposite permanent magnets are successfully produced by mechanical alloying and subsequently annealing at 700~{^\circ}C for 10 minutes. The x-ray diffraction results show that the phase structure of SmCo_6.8Zr_0.2 nanocrystalline permanent magnets is composed of SmCo_{7} phase and SmCo_6.8Zr_0.2/\al-(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_6.8Zr_0.2 and SmCo_6.8Zr_0.2/\al-(Fe,Co) magnets. The inter-grain exchange interaction at low temperature is investigated, which shows that the inter-grain exchange interaction of SmCo_6.8Zr_0.2/\al-(Fe,Co) magnets increases greatly by the decrease of the measured temperature. According to \Delta m_{\rm irr}--H/H_{\rm cj}, \Delta m_{\rm rev}--H/H_{\rm cj} and \chi_{\rm irr}--H/H_{\rm cj} curves at room temperature and 100~K, the changes of irreversible and reversible magnetization behaviours of SmCo_6.8Zr_0.2 and SmCo_6.8Zr_0.2/\al-(Fe,Co) magnets with the decreasing temperature are analysed in detail. The magnetic viscosity and the activation volume of SmCo_6.8Zr_0.2 and SmCo_6.8Zr_0.2/\al-(Fe,Co) magnets at different temperatures are also studied.

Abstract: This paper reports that the SmCo_6.8Zr_0.2 nanocrystalline permanent magnets and SmCo_6.8Zr_0.2/$\alpha$-(Fe,Co) nanocomposite permanent magnets are successfully produced by mechanical alloying and subsequently annealing at 700 ${^\circ}$C for 10 minutes. The x-ray diffraction results show that the phase structure of SmCo_6.8Zr_0.2 nanocrystalline permanent magnets is composed of SmCo₇ phase and SmCo_6.8Zr_0.2/$\alpha$-(Fe, Co) nanocomposite permanent magnets is composed of SmCo₇ and $\alpha$ -(Fe,Co) phases. The mechanism of magnetization reversal is mainly controlled by inhomogeneous domain wall pinning in SmCo_6.8Zr_0.2 and SmCo_6.8Zr_0.2/$\alpha$-(Fe,Co) magnets. The inter-grain exchange interaction at low temperature is investigated, which shows that the inter-grain exchange interaction of SmCo_6.8Zr_0.2/$\alpha$-(Fe,Co) magnets increases greatly by the decrease of the measured temperature. According to $\Delta m_{\rm irr}-H/H_{\rm cj}$, $\Delta m_{\rm rev}-H/H_{\rm cj}$ and $\chi_{\rm irr}-H/H_{\rm cj}$ curves at room temperature and 100 K, the changes of irreversible and reversible magnetization behaviours of SmCo_6.8Zr_0.2 and SmCo_6.8Zr_0.2/$\alpha$-(Fe,Co) magnets with the decreasing temperature are analysed in detail. The magnetic viscosity and the activation volume of SmCo_6.8Zr_0.2 and SmCo_6.8Zr_0.2/$\alpha$-(Fe,Co) magnets at different temperatures are also studied.

Key words: nanocrystalline magnets, coercivity mechanism, inter-grain exchange coupling, magnetization reversal behaviour

中图分类号: (Magnetization reversal mechanisms)

75.60.Jk

75.50.Tt (Fine-particle systems; nanocrystalline materials) 75.50.Ww (Permanent magnets) 81.16.-c (Methods of micro- and nanofabrication and processing) 75.60.Ch (Domain walls and domain structure) 75.60.Lr (Magnetic aftereffects)

刘壮, 陈仁杰, 李东, 闫阿儒. The magnetization reversal behaviour for SmCo_6.8Zr_0.2 and SmCo_6.8Zr_0.2/α -(Fe,Co) nanocrystalline magnets at low temperature[J]. 中国物理B, 2010, 19(6): 67504-067504.

Liu Zhuang(刘壮), Chen Ren-Jie(陈仁杰), Li Dong(李东), and Yan Ar-Ru(闫阿儒). The magnetization reversal behaviour for SmCo_6.8Zr_0.2 and SmCo_6.8Zr_0.2/$\alpha$ -(Fe,Co) nanocrystalline magnets at low temperature[J]. Chin. Phys. B, 2010, 19(6): 67504-067504.

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The magnetization reversal behaviour for SmCo_6.8Zr_0.2 and SmCo_6.8Zr_0.2/α -(Fe,Co) nanocrystalline magnets at low temperature

The magnetization reversal behaviour for SmCo_6.8Zr_0.2 and SmCo_6.8Zr_0.2/$\alpha$ -(Fe,Co) nanocrystalline magnets at low temperature

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The magnetization reversal behaviour for SmCo6.8Zr0.2 and SmCo6.8Zr0.2/α -(Fe,Co) nanocrystalline magnets at low temperature

The magnetization reversal behaviour for SmCo6.8Zr0.2 and SmCo6.8Zr0.2/$\alpha$ -(Fe,Co) nanocrystalline magnets at low temperature

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The magnetization reversal behaviour for SmCo_6.8Zr_0.2 and SmCo_6.8Zr_0.2/α -(Fe,Co) nanocrystalline magnets at low temperature

The magnetization reversal behaviour for SmCo_6.8Zr_0.2 and SmCo_6.8Zr_0.2/$\alpha$ -(Fe,Co) nanocrystalline magnets at low temperature