Issue 10, 2019

Direct imaging of dopant sites in rare-earth element-doped permanent magnet and correlated magnetism origin

Abstract

Identifying the dopants and their occupation sites in rare-earth-doped permanent magnets is critical not only to understand the mechanism of tuning their magnetic properties, but also to develop guiding principles to further improve their performance. In this study, we present a direct observation of the preferred atomic sites of La atoms in La-doped M-type SrFe12O19 hexaferrite. Our data solidly clarified that only the Sr2+ cations were replaced by La3+ cations, and the La-doping caused the changes in the valence states of iron cations located at the 4f1 and 2a crystallographic sites. First principles calculations further revealed that after La-doping, the changes in the spin states of the Fe3+ cations located at the 4f1 tetrahedral sites resulted in magnetization enhancement and those of the 2a octahedral sites contributed to electrical neutrality, well matching the experimental atomic-column resolution EELS and magnetic measurement results.

Graphical abstract: Direct imaging of dopant sites in rare-earth element-doped permanent magnet and correlated magnetism origin

Supplementary files

Article information

Article type
Paper
Submitted
07 Dec 2018
Accepted
09 Feb 2019
First published
11 Feb 2019

Nanoscale, 2019,11, 4385-4393

Direct imaging of dopant sites in rare-earth element-doped permanent magnet and correlated magnetism origin

X. Zeng, J. Zhang, M. Si, D. Cao, X. Deng, H. Ma, Q. Lan, D. Xue, X. Zhang, K. Tao and Y. Peng, Nanoscale, 2019, 11, 4385 DOI: 10.1039/C8NR09922G

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