Realizing high-energy-product SmCo/α-Fe(Co) nanocomposite magnets with high soft phase fraction by component regulation

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

Journal of Magnetism and Magnetic Materials Pub Date : 2025-06-06 DOI:10.1016/j.jmmm.2025.173269

Jieqiong Gao , Tiancong Li , Xiaohong Li , Li Lou , Wei Li , Ping Song , Yingxin Hua , Defeng Guo

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引用次数: 0

Abstract

Forming nanocomposite magnetic materials composed of hard and soft phases is a promising way to enhance the energy product, which have great applications in energy conversion devices and clean energy generators, etc. Especially, SmCo-based nanocomposite magnets are attractive for their exceptionally high Curie temperature and high temperature applications. However, its microstructure control with a high soft phase fraction is of great challenge. Here, we report a strategy to fabricate SmCo/α-Fe(Co) nanocomposite bulk magnets with a soft phase content of over 30 wt%. The resultant (SmCo₇ + SmCo₃)/α-Fe(Co) nanostructure exhibits high soft phase content (31 wt%), small grain size (∼9 nm), and strong texture of the two hard phases (SmCo₇: I₍₀₀₂₎/I₍₁₁₁₎ = 0.96, SmCo₃: I₍₀₀₁₂₎/I₍₁₁₆₎ = 0.77). The good microstructure results in a large coercivity (H_ci = 4.2 kOe) and a high remanence ratio (M_r/M_s = 0.93), achieving an impressive energy product of 28.3 MGOe. This value is 51% larger than that of the SmCo₇/α-Fe(Co) nanocomposite magnets (18.7 MGOe) and 66% higher than that of the highest reported value (17 MGOe) of the SmCo₃/Fe(Co) nanocomposite magnets. The purposeful introduction of Fe, Cu, and Zr elements in the SmCo hard magnetic phase precursor allows the Fe and Co atoms to diffuse from the hard phase to the soft phase, thus obtaining a high soft phase fraction. These results represent an important step to novel SmCo nanocomposite magnets with excellent performance.

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通过组分调控实现高软相分数的高能产品SmCo/α-Fe（Co）纳米复合磁体

制备由软硬相组成的纳米复合磁性材料是提高能量积的一种很有前途的方法，在能量转换装置和清洁能源发电机等方面有很大的应用。特别是，smco基纳米复合磁体因其极高的居里温度和高温应用而具有吸引力。然而，高软相分数的微观组织控制是一个很大的挑战。在这里，我们报告了一种制造SmCo/α-Fe（Co）纳米复合体磁体的策略，其软相含量超过30 wt%。所得的(SmCo7 + SmCo3)/α-Fe（Co）纳米结构具有高软相含量（31 wt%）、小晶粒尺寸（~ 9 nm）和两硬相的强织构(SmCo7: I(002)/I(111) = 0.96, SmCo3: I（0012)/I(116) = 0.77）。良好的微观结构导致了高矫顽力（Hci = 4.2 kOe）和高剩磁比（Mr/Ms = 0.93），实现了令人印象深刻的28.3 MGOe的能量积。该值比SmCo7/α-Fe（Co）纳米复合磁体（18.7 MGOe）高51%，比SmCo3/Fe（Co）纳米复合磁体的最高报道值（17 MGOe）高66%。在SmCo硬磁相前驱体中有意引入Fe、Cu和Zr元素，使Fe和Co原子从硬相扩散到软相，从而获得较高的软相分数。这些结果为开发性能优异的新型SmCo纳米复合磁体迈出了重要的一步。

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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.