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Large-scale micromagnetic simulation of Nd-Fe-B sintered magnets with Dy-rich shell structures

AIP Advances

2016年2月8日(月)

http://dx.doi.org/10.1063/1.4943058
T. Oikawa, H. Yokota, T. Ohkubo, K. Hono

Abstract

Large-scale micromagnetic simulations have been performed using the energy minimization method on a model with structural features similar to those of Dy grain boundary diffusion (GBD)-processed sinteredmagnets.Coercivity increases as a linear function of the anisotropy field of the Dy-rich shell, which is independent of Dy composition in the core as long as the shell thickness is greater than about 15 nm. This result shows that the Dy contained in the initial sinteredmagnets prior to the GBD process is not essential for enhancing coercivity.Magnetization reversal patterns indicate that coercivity is strongly influenced by domain wall pinning at the grain boundary. This observation is found to be consistent with the one-dimensional pinning theory.



研究活動

元素戦略拠点

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触媒・電池元素戦略研究拠点 (京都大学)
東工大元素戦略拠点
東工大元素戦略拠点 (東京工業大学)
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構造材料元素戦略研究拠点 (京都大学)
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