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The Origin of Coercivity Enhancement of Sintered NdFeB Magnets Prepared by Dy Addition

Journal of Magnetics, Volume 18, Number 3, 30 Sep 2013, Pages 235-239

N. J. Yu (Magnetism key laboratory of Zhejiang Province, China Jiliang University), M. X. Pan *

(Magnetism key laboratory of Zhejiang Province, China Jiliang University), P. Y. Zhang (Magnetism key laboratory of Zhejiang Province, China Jiliang University), H. L. Ge (Magnetism key laboratory of Zhejiang Province, China Jiliang University)

Abstract

The effect of Dy addition on the microstructure and magnetic properties of the sintered NdFeB magnets was investigated. The results of the microstructure analysis showed that Dy-free and Dy-doped samples are composed of Nd₂Fe₁₄B (P42/mnm) and a trace of Nd-rich phase. Dy addition reduces significantly the pole density factor of (004), (006) and (008) crystal faces as estimated by the Horta formula. Accordingly, the coercivity of the Dy-doped sample increases from 2038 kA·m⁻¹ up to 2288 kA·m⁻¹. The H_cj(T)/M_s(T) versus /M_s(T) (Kronmüller-plot) behavior shows that the nucleation is the dominating mechanism for the
magnetization reversal in these two kinds of magnets, and two microstructural parameters of α_k and N_eff are obtained. The Kronmüller-Plot gives evidence for an increase of the α_k responsible for an increase of the coercivity as the result of the increase of the magnetic field as the magnetic domain reversed.

Keywords: sintered magnet; coercivity; nucleation mechanism

DOI: http://dx.doi.org/10.4283/JMAG.2013.18.3.235

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