X-ray absorption spectroscopy and magnetic circular dichroism study of Ag-doped Fe3O4

碩士 === 淡江大學 === 物理學系碩士班 === 94 === 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-ed...

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Bibliographic Details
Main Authors: Shin-Hou Liu, 劉訓昊
Other Authors: Way -Faung Pong
Format: Others
Language:zh-TW
Published: 2004
Online Access:http://ndltd.ncl.edu.tw/handle/08725579247329550954
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Summary:碩士 === 淡江大學 === 物理學系碩士班 === 94 === 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.