Coercivity Enhancement of Nd-Fe-B Thin,Film Magnets through Dy Surface Diffusion Process

• 来源期刊: 材料科学技术学报：英文版
• 学科: 化学
• 关键词: 表面扩散 矫顽力 扩散过程 薄膜 Nd Fe 透射电子显微镜 磁体
• 年，卷（期）: 2011,（9）
• 页码范围: 826-830
• 页数: 5页
• 分类号: O613.71|TM273
• 语种: 英文

摘要

The Dy capping layer was deposited at different temperatures on the Nd-Fe-B thin films to investigate the mechanism of the coercivity enhancement through the Dy surface diffusion. The highest coercivity of 2005 kA/m （25.2 kOe） was obtained at the Dy deposition temperature of 460℃, which was significantly higher than the value of 1297 kA/m （16.3 kOe） without Dy capping layer. By performing the transmission electron microscopy （TEM） analysis, it was found that some of the grain boundaries were enriched with Nd element, which could be partly ascribed to the promotion by the Dy surface diffusion. In comparison to the evolution of the spin reorientation temperature of Nd2Fe14B phase after the deposition of the Dy capping layer, it is concluded that structural modification plays a significant role in the coercivity enhancement due to the Dy surface diffusion.