Fast fabrication of a hierarchical nanostructured multifunctional ferromagnet

• 成果类型: Article
• 署名作者: Hua, Yingxin; Li, Xiaohong; Li, Jiaxu; Luo, Xiang; Li, Yuqing; Qin, Wenyue; Zhang, Liqiang; Xiao, Jianwei; Xia, Weixing; Song, Ping; Yue, Ming; Zhang, Hai-Tian; Zhang, Xiangyi
• 署名单位: Yanshan University; Beihang University; Beijing University of Technology; City University of Hong Kong; Chinese Academy of Sciences; Ningbo Institute of Materials Technology & Engineering, CAS
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-9964
• DOI: 10.1126/science.adp2328
• 发表日期: 2024-08-09
• 页码: 634-641
• 关键词: grain-boundary diffusion; electrical-resistivity; magnetic-properties; sm-co; performance; coercivity; sustainability; dependence; texture

摘要

Materials with multifunctionality affect society enormously. However, the inability to surmount multiple functionality trade-offs limits the discovery of next-generation multifunctional materials. Departing from conventional alloying design philosophy, we present a hierarchical nanostructure (HNS) strategy to simultaneously break multiple performance trade-offs in a material. Using a praseodymium-cobalt (PrCo5) ferromagnet as a proof of concept, the resulting HNS outperforms contemporary high-temperature ferromagnets with a 50 to 138% increase in electrical resistivity while achieving their highest energy density. Our strategy also enables an exceptional thermal stability of coercivity (-0.148%/degrees C)-a key characteristic for device accuracy and reliability-surpassing that of existing commercial rare-earth magnets. The multifunctionality stems from the deliberately introduced nanohierarchical structure, which activates multiple micromechanisms to resist domain wall movement and electron transport, offering an advanced design concept for multifunctional materials.