Micromagnetic Analysis on Demagnetization Process of Single-Phase Nanocrystalline Permanent Magnets with Different Degrees of Orientation
来源期刊：JOURNAL OF RARE EARTHS2006年第2期
论文作者：Zhang Hongwei Sun Jirong Chen Renjie Rong Chuanbing Shen Baogen He Shuli
Key words：micromagnetic; finite element method; demagnetization; rare earths;
Abstract: A three-dimentional finite element micromagnetic algorithm was developed to study the magnetization reversal of Pr2Fe14B single-phase nanocrystalline permanent magnets.A single-phase nanocrystalline Pr2Fe14B magnets composed of 216 irregular shaped grains was built.The magnetic hysteresis loops were simulated by micromagnetic finite element method.The contribution of intergrain exchange coupling (IGEC) to remanence enhancement is considered related to the alignment degree in oriented magnets, and decreased with improved grain alignment.For the magnets with perfectly crystallographic alignment of grains, the contribution of IGEC to remanence enhancement is nearly zero.The shape of demagnetization curve is not only dependent on grain alignment degree but also on the strength of IGEC in magnets.
Zhang Hongwei1，Sun Jirong1，Chen Renjie1，Rong Chuanbing1，Shen Baogen1，He Shuli2
(1.State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Science, Beijing 100080, China;
2.Department of Physics, Capital Normal University, Beijing 100037, China)
Abstract:A three-dimentional finite element micromagnetic algorithm was developed to study the magnetization reversal of Pr2Fe14B single-phase nanocrystalline permanent magnets.A single-phase nanocrystalline Pr2Fe14B magnets composed of 216 irregular shaped grains was built.The magnetic hysteresis loops were simulated by micromagnetic finite element method.The contribution of intergrain exchange coupling (IGEC) to remanence enhancement is considered related to the alignment degree in oriented magnets, and decreased with improved grain alignment.For the magnets with perfectly crystallographic alignment of grains, the contribution of IGEC to remanence enhancement is nearly zero.The shape of demagnetization curve is not only dependent on grain alignment degree but also on the strength of IGEC in magnets.
Key words:micromagnetic; finite element method; demagnetization; rare earths;
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