Structure and magnetism of SmCo₅ nanoflakes prepared by surfactant-assisted ball milling with different ball sizes

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• 作者：Junwu Nie ; Xianghua Han ; Juan Du ; Weixing Xia ; Jian Zhang ; Zhaohui Guo ; Aru Yan ; Wei Li ; J. Ping Liu
• 关键词：Sm&ndash ; Co nanoflakes ; Coercivity ; Surfactant assisted ball milling ; Ball size ; Anisotropy
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2013
• 出版时间：December, 2013
• 年：2013
• 卷：347
• 期：Complete
• 页码：116-123
• 全文大小：3027 K

文摘

Anisotropic magnetic SmCo₅ nanoflakes have been fabricated by surfactant-assisted ball milling (SABM) using hardened steel balls of one of the following sizes: 4, 6.5, 9.5 and 12.7 mm in diameters. The magnetic properties of SmCo₅ particles prepared by SABM with different milling ball sizes in diameters were investigated systematically. It was showed that the nanoflakes milled by amount of small size balls had a higher coercivity and lower anisotropy, i.e., worse grain orientation although in a short milling time while the nanoflakes prepared with same weight of big balls tend to have a lower coercivity, better grain orientation. The coercivity mechanism of the nanoflake was studied and it was mainly dominated with the domain-wall pinning. The SEM analysis shows that the morphology of nanoflakes prepared with different ball sizes are almost the same when the balls to powder weight ratio is fixed. The different magnetic properties caused by different ball sizes are mainly due to the different microstructure changes, i.e, grain refinement and c-axis orientation, which are demonstrated by X-ray diffraction (XRD) analysis and transmission electron microscope (TEM). Based on the experiments above, a combined milling process was suggested and done to improve magnetic properties as your need.