期刊
SURFACE SCIENCE
卷 602, 期 17, 页码 2901-2906出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.susc.2008.07.012
关键词
photoelectron spectroscopy; work function measurements; adsorption kinetics; oxidation; nickel oxides; iron oxide; permalloy
资金
- Pluriformation program (PPF)
- Conseil General du Finistere
- Region Bretagne
X-ray photoelectron spectroscopy (XPS) and work-function measurements were used in combination to investigate the initial steps of Permalloy (Ni80Fe20) oxidation at room temperature. They showed that, after oxygen saturation, the surface is covered by nickel oxide (NiO), nickel hydroxide (Ni(OH)(2)) and iron oxides (FexOy), and there is no preferential oxidation. Iron oxidation proceeds through the formation of FeO (Fe2+) followed with Fe2O3 growth (Fe3+). The oxidation is governed by a dissociative Langmuir-type oxidation: the sticking coefficient is decreasing over oxygen exposure. Oxidation continues by oxygen dissolution into the first layers to form a nano-oxide of about 8 angstrom in thickness. (C) 2008 Elsevier B.V. All rights reserved.
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