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Magnetic exchange coupling effect of nanocrystalline Sm-Co ribbons |
JIANG Zhi-yu, CHENG Hong-sheng, LIU Zhi-ying,ZHU Xiao-yu,FANG Yi-kun |
Division of Functional Materials, Central Iron and Steel Research Institute, Beijing 100081,China |
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Abstract In this paper, nanocrystalline Sm-Co ribbons were prepared by melt spinning method. The exchange coupling characteristics of Sm-Co ribbons were revealed by detecting the recovery curves of the ribbons. The effects of quenching speed and heat treatment on the exchange coupling effect of the Sm-Co ribbons were investigated. The exchange coupling effect was further confirmed by the characterization of magnetic microstructures by using magnetic force microscopy. It is found that with the increase of rapid quenching speed, the decrease of the average grain size increases the exchange coupling to a certain extent for the as-melt-spun Sm-Co ribbons. After heat treatment, the phase structure of the Sm-Co ribbons has changed, and the magnetic exchange coupling effect between the grains is enhanced. The irreversible magnetic field, Hn, of the as-melt-spun Sm-Co ribbons, 10 min- and 60min- heat treated ribbons is0.3 T,0.53 T,0.54 T respectively. The Hn of the SmCo ribbons without heat treatment is wider than the heat treated ribbons. The Hn distribution of the Sm-Co ribons after 60 min and 10 min heat treatment is basically the same.
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Received: 15 May 2018
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Corresponding Authors:
方以坤(1977—),男,教授级高级工程师,博士生导师,主要研究方向为稀土永磁及磁力显微学。
E-mail: ykfang@cisri.com.cn
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