CAJ | 학술논문

纳米软硬磁双相交换耦合磁体结合了软磁材料高饱和磁化强度和硬磁材料高矫顽力的优势,磁能积得到明显提高,有望成为大规模应用的新一代永磁材料.介绍了纳米双相耦合磁体的几种假设模型及理论,几种实验室制备方法(包括自下而上法、溅射法、表面活性剂辅助球磨法、高温高压成型、等离子烧结等)及目前取得的成果,以及验证软硬磁双相交换耦合作用的常用表征手段(包括退磁曲线及不可逆磁化率的分析、能谱仪、电子能量损失谱、三维原子探针等),并对交换耦合磁体的研究与应用进行了展望.
납미연경자쌍상교환우합자체결합료연자재료고포화자화강도화경자재료고교완력적우세,자능적득도명현제고,유망성위대규모응용적신일대영자재료.개소료납미쌍상우합자체적궤충가설모형급이론,궤충실험실제비방법(포괄자하이상법、천사법、표면활성제보조구마법、고온고압성형、등리자소결등)급목전취득적성과,이급험증연경자쌍상교환우합작용적상용표정수단(포괄퇴자곡선급불가역자화솔적분석、능보의、전자능량손실보、삼유원자탐침등),병대교환우합자체적연구여응용진행료전망.
Exchange-coupled nanomagnets combine advantages of both hard magnetic phase (high coercivity) and soft magnetic phase (high saturation magnetization), which give rise to enhancement of energy product. Therefore hard/soft nanomagnets are promisingly regarded as the new generation permanent magnetic materials. This paper reviews fundamental theory and models, some preparation methods (including bottom-up approach, sputtering method, surfactant-assisted ball milling, high-pressure warm compaction, spark plasma sintering) and achievements, and common characterization methods (including demagnetization curve and irreversible magnetic susceptibility, energy dispersive spectroscopy, electron energy loss spectroscopy, 3D atom probe). Based on the progress, potential developments of exchange-coupled magnets are proposed.