Depth-selective conversion electron Mössbauer spectroscopy of thin Fe films

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Abstract

The depth-sensitivity of energy-differential conversion electron Mössbauer spectroscopy (DCEMS) was tested by using a 50 Å57Fe film evaporated onto 1320 Å natural Fe and coated by 0, 50 and 100 Å natural Fe. The average hyperfine field of 34 Å 57Fe on 340 Å 56Fe was found to be slightly smaller than (≈326 kOe) the bulk field. Surface effects were drastically enhanced if Auger electron Mössbauer spectroscopy (AEMS) at 600 eV was performed.

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On leave from the Institute for Chemical Research, Kyoto University, Uji, Kyoto-fu 611, Japan.

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