Magnetic flux density measurements from grain boundary phase in 0.1 at% Ga-doped Nd-Fe-B sintered magnet

SCRIPTA MATERIALIA

卷:178

Article

Cho, Youngji¹  Sasaki, Taisuke²  Harada, Ken³  Sato, Atsuko¹  Tamaoka, Takehiro¹  Shindo, Daisuke³  Ohkubo, Tadakatsu²  Hono, Kazuhiro²  Murakami, Yasukazu^1,4 

[1] Kyushu Univ, Dept Appl Quantum Phys & Nucl Engn, Fukuoka 8190395, Japan

[2] Natl Inst Mat Sci, ESICMM, Tsukuba, Ibaraki 3050047, Japan

[3] RIKEN, CEMS, Hatoyama, Saitama 3500395, Japan

[4] Kyushu Univ, Ultramicroscopy Res Ctr, Fukuoka 8190395, Japan

关键词: Permanent magnets;    Nd-Fe-B;    Coercivity;    Grain boundary;    Transmission electron microscopy;   

DOI  :  10.1016/j.scriptamat.2019.12.030

来源: Elsevier

【 摘 要 】

The magnetism of a narrow (similar to 1.6 nm) grain boundary phase produced in a 0.1 at% Ga-doped Nd-Fe-B sintered magnet was examined using electron holography. The magnetic flux density was determined to be 0.8 +/- 0.1 T, which was smaller than that for a commercial magnet free from Ga doping (similar to 1.0 T). The presence of a ferromagnetic grain boundary phase reasonably explained the functionality of the 0.1 at% Ga-doped system, such as the improvement in the squareness of the demagnetization curve. The observations provide useful information for deeper understanding of the coercivity mechanism in Ga-doped Nd-Fe-B sintered magnets. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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