材料科学
剩磁
纳米复合材料
磁铁
矫顽力
纳米晶材料
成核
制作
纹理(宇宙学)
粒度
各向异性
复合材料
磁各向异性
磁化
凝聚态物理
纳米技术
磁场
光学
热力学
物理
图像(数学)
病理
人工智能
医学
量子力学
替代医学
计算机科学
作者
Li Lou,Ming Li,Tiancong Li,Bo Jiang,Yingxin Hua,Jieqiong Gao,Jinyi Wang,Bo He,Jingdong Wang,Xiaohong Li,Haitian Zhang
摘要
For bulk SmCo3 system hard-soft magnetic nanocomposites, it remains a challenge to fabricate an anisotropic magnet by forming a strong texture for the nanocrystalline SmCo3 phase. In this paper, we report the fabrication of a bulk anisotropic SmCo3/Fe(Co) nanocomposite magnet with a strong (00 l) texture for the SmCo3 phase and a small grain size of 21 nm for the Fe(Co) phase. Good results were achieved by controlling the nucleation and growth of the nanocrystals from the amorphous matrix using large stress and strain. The synthesized magnet exhibited a high-energy product of 17.0 MGOe, which was 26% larger than the reported highest value of 13.5 MGOe for SmCo3-based nanocomposites and 314% higher than 4.1 MGOe for the corresponding pure SmCo3 magnets. Moreover, these magnets possessed small remanence and coercivity temperature coefficients of α = −0.018%/°C and β = −0.24%/°C, which were much lower than those α = −0.14%/°C and β = −0.31%/°C for pure SmCo3 magnets and α = −0.073%/°C and β = −0.30%/°C for SmCo3/Fe(Co) isotropic nanocomposite. These findings are an important step toward the practical application of the SmCo3-based nanocomposite.
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