Formation of CoMnSi monocrystalline microspheres by inhibiting the spontaneous generation of martensitic nuclei

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

Journal of Magnetism and Magnetic Materials Pub Date : 2025-07-17 DOI:10.1016/j.jmmm.2025.173383

Ye Huang , Yangguang Shi , Jin Qian , Yezi Lu , Wenhao Zhang , Binglin Wang , Weixin Guo , Shaolong Tang , Shaochun Tang

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Abstract

For magnetostrictive materials, single crystals are essential to achieve strong anisotropy and giant magnetostriction. However, it is still a great challenge to prepare single-crystal compounds with high-temperature solid transition. In this work, CoMnSi monocrystalline microspheres are synthesized by completely inhibiting the spontaneous generation of martensitic nuclei in austenitic spherical single crystals. The growth mechanism of single crystal during martensitic transition and the influence of internal stress on the metamagnetic transition are revealed. Notably, the critical magnetic field was substantially reduced from 2.5 T to 0.5 T at room temperature. 〈100〉 -oriented CoMnSi composite with these single crystals achieved a giant and reversible magnetostriction of −902 ppm at 0.8 T. This work not only significantly enhances the low-field magnetostrictive performance of CoMnSi but also provides a scalable and practical method to synthesize single-crystal microspheres with high-temperature martensitic transition.

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抑制马氏体核自发生成CoMnSi单晶微球

对于磁致伸缩材料来说，单晶是实现强各向异性和巨磁致伸缩所必需的。然而，制备具有高温固相转变的单晶化合物仍然是一个很大的挑战。本研究通过完全抑制奥氏体球形单晶中马氏体核的自发生成，合成了CoMnSi单晶微球。揭示了马氏体相变过程中单晶的生长机理和内应力对变磁相变的影响。值得注意的是，临界磁场在室温下从2.5 T大幅降低到0.5 T。利用这些单晶制备的< 100 >取向的CoMnSi复合材料在0.8 t时获得了−902 ppm的巨大可逆磁致伸缩，不仅显著提高了CoMnSi的低场磁致伸缩性能，而且为合成具有高温马氏体转变的单晶微球提供了一种可扩展和实用的方法。

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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.