In-situ x-ray diffraction studies on post-deposition vacuum-annealing of ultra-thin iron oxide films

F. Bertram; C. Deiter; K. Pflaum; M. Suendorf; C. Otte; J. Wollschlaeger

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In-situ x-ray diffraction studies on post-deposition vacuum-annealing of ultra-thin iron oxide films

机译：超薄氧化铁膜沉积后真空退火的原位X射线衍射研究

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A maghemite (γ-Fe_2O_3) film of 8.3 nm thickness is epitaxially grown on MgO(001) single crystal substrate by reactive molecular beam epitaxy. Chemical composition and crystal structure of the surface was studied by x-ray photoelectron spectroscopy and low energy electron diffraction, respectively. Afterwards the sample was moved to a heating cell for in situ x-ray diffraction experiments oil the post-deposition annealing process in high-vacuum to study structural phase transitions of the iron oxide film. The iron oxide film is reduced with increasing temperature. This reduction occurs in two steps that are accompanied by structural transitions. The first step is a reduction from γ-Fe_2O_3 to Fe_3O_4 at 360 ℃ and the second step is the reduction from Fe_3O_4 to FeO at 410 ℃.

机译：通过反应分子束外延在MgO（001）单晶衬底上外延生长了厚度为8.3 nm的磁铁矿（γ-Fe_2O_3）膜。通过X射线光电子能谱和低能电子衍射分别研究了表面的化学组成和晶体结构。之后，将样品移至加热室进行原位X射线衍射实验，并在高真空下进行沉积后退火处理，以研究氧化铁膜的结构相变。随着温度升高，氧化铁膜被还原。这种减少发生在两个步骤中，伴随着结构的转变。第一步是在360℃下从γ-Fe_2O_3还原为Fe_3O_4，第二步是在410℃下从Fe_3O_4还原为FeO。

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来源
《Journal of Applied Physics》 |2011年第10期|p.102208.1-102208.5|共5页
作者
F. Bertram; C. Deiter; K. Pflaum; M. Suendorf; C. Otte; J. Wollschlaeger;
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作者单位

Hamburger Synchrotronstrahlungslabor am Deutschen Elektronen-Synchrotron, Notkestr. 85, 22607 Hamburg, Germany;

Hamburger Synchrotronstrahlungslabor am Deutschen Elektronen-Synchrotron, Notkestr. 85, 22607 Hamburg, Germany;

Hamburger Synchrotronstrahlungslabor am Deutschen Elektronen-Synchrotron, Notkestr. 85, 22607 Hamburg, Germany;

Physics Department, University Osnabruck, Barbarastr. 7,49069 Osnabrueck, Germany;

Physics Department, University Osnabruck, Barbarastr. 7,49069 Osnabrueck, Germany;

Physics Department, University Osnabruck, Barbarastr. 7,49069 Osnabrueck, Germany;

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In-situ x-ray diffraction studies on post-deposition vacuum-annealing of ultra-thin iron oxide films

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