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ヤマガミ ヒロシ
YAMAGAMI HIROSHI
山上 浩志 所属 京都産業大学 理学部 物理科学科 職種 教授 |
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| 言語種別 | 英語 |
| 発行・発表の年月 | 2013/09/14 |
| 形態種別 | 研究論文 |
| 査読 | 査読あり |
| 標題 | Enhanced ferromagnetic moment in Co-doped BiFeO3 thin films studied by soft x-ray circular dichroism |
| 執筆形態 | その他 |
| 掲載誌名 | Journal of Applied Physics |
| 出版社・発行元 | AMER INST PHYSICS |
| 巻・号・頁 | 114(10) |
| 著者・共著者 | V. R. Singh,V. K. Verma,K. Ishigami,G. Shibata,Y. Yamazaki,A. Fujimori,Y. Takeda,T. Okane,Y. Saitoh,H. Yamagami,Y. Nakamura,M. Azuma,Y. Shimakawa |
| 概要 | BiFeO3 (BFO) shows both ferroelectricity and magnetic ordering at room temperature, but its ferromagnetic component, which is due to spin canting, is negligible. Substitution of transition-metal atoms such as Co for Fe is known to enhance the ferromagnetic component in BFO. In order to reveal the origin of such magnetization enhancement, we performed soft x-ray absorption spectroscopy (XAS) and soft x-ray magnetic circular dichroism (XMCD) studies of BiFe1-xCoxO3 (x = 0 to 0.30) (BFCO) thin films grown on LaAlO3(001) substrates. The XAS results indicated that the Fe and Co ions are in the Fe3+ and Co3+ states. The XMCD results showed that the Fe ions show ferromagnetism, while the Co ions are antiferromagnetic at room temperature. The XAS and XMCD measurements also revealed that part of the Fe3+ ions are tetrahedrally co-ordinated by oxygen ions but that the XMCD signals of the octahedrally coordinated Fe 3+ ions increase with Co content. The results suggest that an impurity phase such as the ferrimagnetic γ-Fe2O3 which exists at low Co concentration decreases with increasing Co concentration and that the ferromagnetic component of the Fe3+ ion in the octrahedral crystal fields increases with Co concentration, probably reflecting the increased canting of the Fe3+ ions. © 2013 AIP Publishing LLC. |
| DOI | 10.1063/1.4821024 |
| ISSN | 0021-8979/1089-7550 |