采用传统烧结工艺制备了一组2∶17型烧结 SmCo 磁体。采用综合物性测量系统(PPMS)、洛伦兹透射电镜(LTEM)和微磁学计算研究了磁体的磁性能、磁畴结构及磁化过程中磁矩的变化过程。结果表明：经慢冷工艺的样品矫顽力为2180 kA/m,磁畴壁沿1∶5相分布显示出明显的畴壁钉扎特性,未经慢冷工艺的样品矫顽力很低且磁畴壁呈直线型穿过2∶17相；经慢冷工艺的样品的Cu元素在1∶5相处富集使两相交界处磁晶各向异性降低；微磁学模拟计算证明1∶5相和2∶17相界面处对磁畴壁的吸引钉扎导致慢冷样品矫顽力的提高。
A set of sintered Sm2 Co17 magnets were prepared by conventional sintering process,then their hys-teresis loops,magnetic domain structures and changes of magnetic moments during magnetization process were inves-tigated by physical property measurement system (PPMS),Lorentz transmission electron microscopy (LTEM)and micromagnetic simulation,respectively.The results indicated that the sample treated by slow cooling process has a coercivity of 2180 kA/m and magnetic domain walls distributing along the 1∶5 phases,which shows obvious domain wall pinning properties,contrasting sharply with the remarkably low coercivity of the sample without slow cooling treatment and the“straight line”feature of magnetic domain walls running through 2∶1 7 phases.We observed the Cu enrichment in 1∶5 phases of the sample treated by slow cooling process,which attenuates interface magnetocrystalline anisotropy.A two-dimensional model was established through micromagnetic simulation,and the calculated changes of magnetic moments under different external magnetic fields confirmed the facilitating effect of attractive pinning by the interface between 1∶5 and 2∶1 7 phases on magnet′s coercivity.
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