Investigation on Hard Magnetic Properties of Nanocomposite Permanent Magnets with Precipitate-Typed Microstructure by Micromagnetic Finite-Element Methods
来源期刊：JOURNAL OF RARE EARTHS2004年第1期
论文作者：荣传兵 张绍英 沈保根 杜晓波 张宏伟
Key words：micromagnetic; finite element method; rare earths;
Abstract: The demagnetization curves were calculated using micromagnetic finite-element method for nanocomposite Pr2Fe14B/α-Fe permanent magnets with precipitate-typed microstructure. Due to intergrain exchange coupling, both remanence enhancement and a single magnetic phase behavior in demagnetization curve were found. For the samples with the hard phase as the precipitate and the soft one as the matrix, a coercivity μ0Hc of 0.78 T, a remanence Jr of 1.18 T and a large energy product(BH)max of 200 kJ·m-3 are obtained for the sample with hard grain size being 23 nm. While, for the sample with the soft phase as the precipitate, μ0Hc of 0.95 T, Jr of 1.24 T and(BH)max of 240 kJ·m-3 are obtained for the sample with soft grain size being 10 nm. The calculating results were compared with the experimental Pr8Fe87B5 ribbons. The dependence of remanence and coercivity on the microstructure was discussed extensively.
荣传兵1，张绍英1，沈保根1，杜晓波1，张宏伟1
(1.State Key Laboratory of Magnetism, Institute of Physics and Centre for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China)
Abstract:The demagnetization curves were calculated using micromagnetic finite-element method for nanocomposite Pr2Fe14B/α-Fe permanent magnets with precipitate-typed microstructure. Due to intergrain exchange coupling, both remanence enhancement and a single magnetic phase behavior in demagnetization curve were found. For the samples with the hard phase as the precipitate and the soft one as the matrix, a coercivity μ0Hc of 0.78 T, a remanence Jr of 1.18 T and a large energy product(BH)max of 200 kJ·m-3 are obtained for the sample with hard grain size being 23 nm. While, for the sample with the soft phase as the precipitate, μ0Hc of 0.95 T, Jr of 1.24 T and(BH)max of 240 kJ·m-3 are obtained for the sample with soft grain size being 10 nm. The calculating results were compared with the experimental Pr8Fe87B5 ribbons. The dependence of remanence and coercivity on the microstructure was discussed extensively.
Key words:micromagnetic; finite element method; rare earths;
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