finite element method; rare earths

作者:张宏伟,荣传兵,杜晓波,张绍英,沈保根
关键词:micromagnetic; finite element method; rare earths
单位:State Key Laboratory of Magnetism,State Key Laboratory of Magnetism,State Key Laboratory of Magnetism,State Key magnetic materials
http://www.999magnet.com Laboratory of Magnetism,State Key Laboratory of Magnetism  Institute of Physics and Centre for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China








, Institute of Physics and Centre for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China








, Institute of Physics and Centre for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China








, Institute of Physics and Centre for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China








, Institute of Physics and Centre for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China
摘要:The demagnetization curves were calculated using micromagnetic finite-element method for nanocomposite Pr  2Fe    14B/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 μ  0H  c of 0.78 T, a remanence J  r 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, μ  0H  c of 0.95 T, J  r 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 Pr  8Fe    87B  5 ribbons. The dependence of remanence and coercivity on the microstructure was discussed extensively.