前驱体状态对三相（SmCo7 + SmCo3）/铁（Co）磁体形成的影响

IF 2.5 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials Pub Date : 2024-11-15 DOI:10.1016/j.jmmm.2024.172666

Jieqiong Gao, Xiaohong Li, Tiancong Li, Li Lou, Yingxin Hua, Jinyi Wang, Yiran Li, Defeng Guo

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引用次数: 0

摘要

结合前驱体的制造和随后的热处理是制作基于钐钴的多相纳米复合磁体的有效策略。然而，关于前驱体状态对多相磁体形成的影响的全面了解还有待充分探索。本研究通过机械合金化方法制备了 Sm(CoFeCuZr)/Fe(Co) 前驱体。通过调整球磨工艺以及软磁相的含量和成分，对前驱体状态进行了定制。钐钴相的非晶化程度、钐钴合金中 Sm:Co 的原子比以及前驱体中 Fe(Co) 的含量随着球磨时间的增加、软磁相含量的增加以及软磁相中 Fe 的比例的增加而增加。这导致在 400-720 °C 下退火的样品中，Fe(Co) 和 SmCo3 相的含量增加，但 SmCo7 相的含量减少。这进一步导致了三相（SmCo7 + SmCo3）/铁（Co）磁体饱和磁化率的增加和矫顽力的降低。我们研究了前驱体状态控制和三相磁体形成的机制。

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Effect of precursor state on the formation of triphase (SmCo7 + SmCo3)/Fe(Co) magnets

The combination of fabrication of a precursor and subsequent thermal treatments is an effective strategy for crafting multi-phase SmCo-based nanocomposite magnets. However, a comprehensive understanding of the effect of precursor state on the formation of multiphase magnets has yet to be fully explored. In this study, Sm(CoFeCuZr)/Fe(Co) of precursors were prepared via mechanical alloying. The precursor state was tailored by adjusting the ball milling process, as well as the content and composition of soft magnetic phase. The amorphization degree of the SmCo phase, the atomic ratio of Sm:Co in the SmCo alloy, and the content of Fe(Co) in the precursor increase with the increasing ball milling time, the increase in the content of the soft phase and the proportion of Fe within the soft phase. And this resulted in an increase in the content of Fe(Co) and SmCo₃ phases but a decrease in the content of SmCo₇ phase in samples annealed at 400–720 °C. This further led to an increase in the saturation magnetization and a decrease in the coercivity of the triphase (SmCo₇ + SmCo₃)/Fe(Co) magnet. The mechanisms responsible for the precursor state control and the formation of the triphase magnet were investigated.

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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.