Coercivity mechanism of La-Nd-Fe-B films with Y spacer layer
Jun Ma(马俊)1,2, Xiao-Tian Zhao(赵晓天)1,†, Wei Liu(刘伟)1,‡, Yang Li(李阳)1,2, Long Liu(刘龙)1,2, Xin-Guo Zhao(赵新国)1, and Zhi-Dong Zhang(张志东)1
1 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China; 2 School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
Abstract The effect of the Y spacer layer on the phase composition, coercivity, and magnetization reversal processes of La-Nd-Fe-B films has been investigated. The addition of a 10 nm Y spacer layer increases the coercivity of the film to 1.36 T at 300 K and remains 0.938 T at 380 K. As the thickness of the Y spacer layer increases, Y participates in the formation of the main phase in the film, and further regulates the formation of La-B phases. The results of the first-order reversal curve (FORC) and micromagnetic fitting show that the coercivity of all the films is dominated by nucleation mechanism. The c-axis preferred orientation, good magnetic microstructure parameters and the largest dipole interaction enhance the coercivity. Therefore, the introduction of the Y spacer layer can be an effective way to improve the coercivity of La-Nd-Fe-B film over a wide temperature range of 150 K-380 K.
Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2021YFB3500303) and the National Natural Science Foundation of China (Grant Nos. 52031014 and 51971219).
Corresponding Authors:
Xiao-Tian Zhao, Wei Liu
E-mail: xtzhao@imr.ac.cn;wliu@imr.ac.cn
Cite this article:
Jun Ma(马俊), Xiao-Tian Zhao(赵晓天), Wei Liu(刘伟), Yang Li(李阳), Long Liu(刘龙), Xin-Guo Zhao(赵新国), and Zhi-Dong Zhang(张志东) Coercivity mechanism of La-Nd-Fe-B films with Y spacer layer 2024 Chin. Phys. B 33 037507
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