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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 essential and critical not only to understand the mechanism of tuning their magnetic properties, but also to find guiding principles to further improve their performance. In this work, we present an observation of the preferred atomic sites of La atoms in La-doped M-type SrFe12O19 hexaferrite. Our data solidly clarify that only the Sr2+ cations are replaced by La3+ cations and the La-doping causes the changes of valence states of iron cations located at 4f1 and 2a crystallographic sites. First-principle calculations further unveil that after La-dopping the changes of the spin states of Fe3+ cations located at 4f1 tetrahedral sites result for the magnetization enhancement and these of 2a octahedral sites contribute electrical neutrality, well matching with experimental atomic-column resolution EELS and magnetic measurements.

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Publication details

The article was received on 07 Dec 2018, accepted on 09 Feb 2019 and first published on 11 Feb 2019


Article type: Paper
DOI: 10.1039/C8NR09922G
Citation: Nanoscale, 2019, Accepted Manuscript

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

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

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