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

材料科学技术（英）, 2011, 27(9): 826-830.

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

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1.State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China／School of Materials Science and Engineering, Xi＇an University of Technology, Xi＇an 710048, China

2.State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China

3.School of Materials Science and Engineering, Xi＇an University of Technology, Xi＇an 710048, China

4.School of Materials Science and Engineering, Xi＇an University of Technology, Xi＇an 710048, China

基金项目: the National Natural Science Foundation of China(51001085) the Doctoral Course Foundation of Ministry of Education of China(20106118120015) the Educational Department of Shaanxi Provincial Government(2010JK766) This work was in part supported by the State Key Laboratory for Advanced Metals and Materials(2010ZD- 03)

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

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

Keywords： Nd-Fe-B thin film , Coercivity enhancement , Dy layer , Microstructure ,

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.

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

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

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