Spectroscopic investigation reveals electron transfer and decreased saturation magnetization in silver-doped Fe3O4 films, indicating that silver clustering suppresses host magnetic moments.
The electronic and magnetic properties of Ag-doped Fe3O4 films were studied by x-ray absorption near-edge structure (XANES), extended x-ray absorption fine structure (EXAFS), and x-ray magnetic circular dichroism (XMCD) measurements. A comparison between the Ag K-edge EXAFS Fourier transform spectra of Ag-doped Fe3O4 and the Ag metal shows that Ag atoms aggregate into Ag granules. The O K-edge and Ag L3-edge XANES spectra consistently indicate an electron transfer from the Fe3O4 host into Ag granules. The Fe L3,2-edge XMCD spectra and hysteresis measurements reveal that Ag granules reduce the average magnetic moment of Fe ions and the saturation magnetization of Fe3O4.
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Liu et al. (2006) studied this question.
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