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Natural Oxidation of thin Fe Films on V Buffer Layer

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Dawczak-Dębicki H., Marczyńska A., Rogowska A., Wachowiak M., Nowicki M., Pacanowski S., Jabłoński B., Kowalski W., Grembowski J., Czajka R., Smardz L.

Acta Physica Polonica A

2017

vol. 132

issue 4

1272-1276

We have studied oxidation kinetics of Fe thin film under atmospheric conditions using the fact that metallic iron is a ferromagnet but ultrathin natural iron oxides are approximately nonmagnetic at room temperature. As a consequence, oxidation is associated with a loss in total Fe magnetic moment. Results show that the sample with an initial Fe thickness equal to 10 nm oxidize relatively fast (time constant τ=0.05 day), whereby a constant amount of 2.5 nm of metal is transformed into oxides. For lower iron initial thickness (d_{i}=4 nm) the time constant for oxidation significantly increases reaching a value of 2 days. Furthermore, X-ray photoelectron spectroscopy studies performed after 144 days of oxidation revealed formation of hematite (α-Fe₂O₃) thin film on the metallic rest of iron.

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1 Acta Physica Polonica A

1 2017

1 Czajka R.

1 Dawczak-Dębicki H.

1 Grembowski J.

1 Jabłoński B.

1 Kowalski W.

1 Marczyńska A.

1 Nowicki M.

1 Pacanowski S.

1 Rogowska A.

1 Smardz L.

1 Wachowiak M.

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Natural Oxidation of thin Fe Films on V Buffer Layer