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Wavelet-XAFS investigation for Mn:Si diluted magnetic semiconductor thin films

Rendiconti Lincei, ISSN: 2037-4631, Vol: 22, Issue: SUPPL. 1, Page: 25-32
2011
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The Morlet wavelet transformation (MT) was used to analyze Mn K-edge extended X-ray absorption fine structure (EXAFS) spectra of Mn-doped Si-based diluted magnetic semiconductor (DMS) thin films grown by the magnetron co-sputtering method. MT of EXAFS data shows that the Mn-Mn scattering path can be distinguished by the Mn-Si scattering path in the spectra of Mn Si DMS thin films. In all DMS thin films Mn atoms fill Si sites without forming Mn-Si compounds while Mn-Si compounds are present in the annealed analogues. From the analysis of experimental data we point out that low-concentration Mn-doped samples are characterized by a more symmetric structure. © 2011 Springer-Verlag.

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