期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 644, 期 -, 页码 30-39出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2015.04.189
关键词
Ceramics; Doping; Electronic structure; Point defects
资金
- National Natural Science Foundation of China [11304273, 10764005, 11164034]
- Yunnan Provincial Natural Science Foundation of China [2010DC053]
First-principles calculations are used to investigate the ferromagnetism of N-doped BiFeO3 (BFO). It is found that one N atom doped BFO at O site can produce a total magnetic moment of 1 AB compared with the no magnetic moment in the perfect BFO. The magnetic moment originates from the destroyed antiferromagnetic spin arrangement of Fe ions, the spin-polarized N and O atoms. Systematic study of electronic structure further indicated that the magnetism is attributed to the holes in the N-2p, O-2p and Fe-3d states induced by N substitution for O atom. Total energy calculations show that the N impurities tended to ferromagnetic alignment in BFO. Magnetism is also investigated with the appearance of intrinsic defects (Bi and O vacancies) in N-doped BFO, we found that Bi vacancies are beneficial for enhancing the ferromagnetism while O vacancies are the opposite. The enhanced ferromagnetism obtained by N doping indicating a promising way for improving multiferroic properties of BFO. (C) 2015 Elsevier B.V. All rights reserved.
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