Very thin oxide layers on Fe metal surfaces with the thickness of ca. 10 Å, are investigated by means of Mössbauer absorption spectroscopy using surface-selectively enriched samples. The oxide is similar to γ-Fe2O3 but has non-collinear spin arrangement at 4.2 K and is superparamagnetic at 300 K. The reduction of the recoilless fraction at 300 K is not drastic. Oxidation of Fe surfaces coated by Sb layers is also studied.
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Shinjo et al. (1984) studied this question.
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