1997年
MBE-growth of iron and iron oxide thin films on MgO(100), using NO<inf>2</inf>, NO, and N<inf>2</inf>O as oxidizing agents
Materials Research Society Symposium - Proceedings
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- 巻
- 477
- 号
- 開始ページ
- 211
- 終了ページ
- 216
- 記述言語
- 掲載種別
- 研究論文(国際会議プロシーディングス)
We have made a study of the use of NO as the source of oxygen in the MBE-growth of iron oxides thin films. It is found that NO is a much more efficient oxidizing agent than molecular O . As indicated by Moessbauer spectroscopy, performed on Fe probe layers, NO is not only capable of forming stoichiometric magnetite Fe O , but also all non-stoichiometric Fe O phases. Even the metastable maghemite phase γ-Fe O (Fe O with δ = 1/3) can be formed. All iron oxides grow layer-by-layer-like, as indicated by strong RHEED intensity oscillations. When small doses of NO are used, new wustite Fe O and Fe O phases are formed. In contrast to the Fe O films, these phases have nitrogen incorporated into the crystal lattice. Similar compounds are obtained when NO is used as the source of oxygen. The use of N O does not lead to the formation of iron oxides. It does, however, alter the growth mode of Fe on MgO(100). Whereas Fe deposited under UHV conditions forms 3D islands, the N O acts as a surfactant and induces 2D layer-by-layer growth. 2 2 2 2 3 4 3-δ 4 2 3 3-δ 4 2 1-x 3 4 3-δ 4 2 2 57
- リンク情報
- ID情報
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- ISSN : 0272-9172
- SCOPUS ID : 0031382241