Enhancement of perpendicular magnetic anisotropy and formation of interface in Nd-Dy-Fe-Co-B thick film with Ta spacer layer

被引:9
作者
Ye, Z. X. [1 ,2 ]
Zhao, X. T. [1 ]
Liu, W. [1 ]
Liu, L. [1 ]
Wu, J. X. [1 ,2 ]
Li, Y. [1 ,2 ]
Ma, J. [1 ,2 ]
Ju, H. Z. [1 ,2 ]
Song, Y. H. [2 ]
Zhang, Z. D. [1 ]
机构
[1] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
[2] Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
关键词
Perpendicular magnetic anisotropy; Ta spacer layers; Interface; Nd element aggregation; Exchange interaction; HIGH-COERCIVITY; MECHANISM; MICROSTRUCTURE; BUFFER; TEXTURE;
D O I
10.1016/j.surfin.2023.102697
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The perpendicular magnetic anisotropy of Nd-Fe-B films decreases when the film thickness increases above a critical value, owing to the formation of the in-plane texture. To avoid this dilemma, the influences of Ta spacer layers on the microstructure and magnetic properties of Nd-Dy-Fe-Co-B thick films are systematically investi-gated by varying the number and thickness of Ta spacer layers. With increasing the number and thickness of Ta spacer layers, a great enhancement of the perpendicular magnetic anisotropy is found, while the coercivity maintains around 2 T. According to the analysis of microstructural results, some interfaces are formed, with the Nd-Fe-B columnar crystal and the Nd element aggregation area being the two sides of the interface. It is found that the Ta spacer layer facilitates the formation of the out-of-plane texture. In addition, the Ta spacer layer has the effect of enhancing the pinning effect leading to a high coercivity. Based on first-order reversal curve analysis, the Ta spacer layer can enhance the dipole interaction and reduce the exchange interaction, which reveals that Nd-Fe-B grains are isolated by the Nd-rich phase. This work can help us to prepare thick Nd-Fe-B-based films with high perpendicular magnetic anisotropy and high coercivity for applications in micro-mechanical systems.
引用
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页数:10
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