NdFeB coercivity enhancement and temperature coefficient reduction by Pr-Dy-Co diffusion

IF 3 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Magnetism and Magnetic Materials Pub Date : 2025-02-15 DOI:10.1016/j.jmmm.2025.172856

Kehan Ren , Qing Li , Shuai Cao , Xiangming Lu , Jiateng Zhang , Shengzhi Dong , Shuai Guo , Renjie Chen , Aru Yan

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Abstract

Grain boundary diffusion is utilized to enhance magnetic properties by modulating the organizational structure of the magnet surface layer and optimizing the grain boundary structure. In this study, diffusion sources of Pr_xDy_58-_xCo₄₂ (x = 0, 15, 30, 45, and 58 at%) alloys were designed to increase the coercivity while reducing the Dy consumption. The results indicate that when the Pr content in the diffusion source reached 45 %, coercivity increased significantly from 13.87 kOe to 21.76 kOe. In addition, the thermal stability and Curie temperature of the magnet were improved considerably. The increase in Pr content also led to a significant increase in the grain boundary phases of the diffused magnets. This is attributed to the introduction of Pr, which facilitates the formation of grain boundary phases and enhances demagnetization coupling between the main phases. The Pr₄₅Dy₁₃Co₄₂ alloy investigated in this study provides novel insights into the potential design of diffusion sources.

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Pr-Dy-Co扩散增强NdFeB矫顽力和降低温度系数

晶界扩散通过调节磁体表层组织结构和优化晶界结构来增强磁性能。在本研究中，设计了PrxDy58-xCo42 （x = 0、15、30、45和58 at%）合金的扩散源，以提高矫顽力，同时减少Dy消耗。结果表明：当扩散源中Pr含量达到45%时，矫顽力由13.87 kOe显著提高到21.76 kOe；此外，磁体的热稳定性和居里温度也有了较大的提高。Pr含量的增加也导致扩散磁体的晶界相显著增加。这是由于Pr的引入促进了晶界相的形成，增强了主相之间的退磁耦合。本研究研究的Pr45Dy13Co42合金为扩散源的潜在设计提供了新的见解。

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来源期刊

Journal of Magnetism and Magnetic Materials 物理-材料科学：综合

CiteScore

5.30

自引率

11.10%

发文量

1149

审稿时长

59 days

期刊介绍： The Journal of Magnetism and Magnetic Materials provides an important forum for the disclosure and discussion of original contributions covering the whole spectrum of topics, from basic magnetism to the technology and applications of magnetic materials. The journal encourages greater interaction between the basic and applied sub-disciplines of magnetism with comprehensive review articles, in addition to full-length contributions. In addition, other categories of contributions are welcome, including Critical Focused issues, Current Perspectives and Outreach to the General Public. Main Categories: Full-length articles: Technically original research documents that report results of value to the communities that comprise the journal audience. The link between chemical, structural and microstructural properties on the one hand and magnetic properties on the other hand are encouraged. In addition to general topics covering all areas of magnetism and magnetic materials, the full-length articles also include three sub-sections, focusing on Nanomagnetism, Spintronics and Applications. The sub-section on Nanomagnetism contains articles on magnetic nanoparticles, nanowires, thin films, 2D materials and other nanoscale magnetic materials and their applications. The sub-section on Spintronics contains articles on magnetoresistance, magnetoimpedance, magneto-optical phenomena, Micro-Electro-Mechanical Systems (MEMS), and other topics related to spin current control and magneto-transport phenomena. The sub-section on Applications display papers that focus on applications of magnetic materials. The applications need to show a connection to magnetism. Review articles: Review articles organize, clarify, and summarize existing major works in the areas covered by the Journal and provide comprehensive citations to the full spectrum of relevant literature.