Resolved magnetic hyperfine spectra of Au-Fe alloys as a function of temperature |
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| Institution: | 1. International Center for Young Scientists, National Institute for Materials Science, Ibaraki 305-0044, Japan;2. Research Center for Electronic and Optical Materials, National Institute for Materials Science, Ibaraki 305-0044, Japan;3. Univ. Rennes, CNRS, Institut des Sciences Chimiques de Rennes (ISCR)-UMR6226 F-35000 Rennes, France;4. CNRS–Saint-Gobain–NIMS, IRL3629, Laboratory for Innovative Key Materials and Structures, National Institute for Materials Science, Ibaraki 305-0044, Japan;1. School of Materials Science and Engineering, Shenyang Ligong University, Shenyang 110159, China;2. Science and Technology Development Corporation of Shenyang Ligong University, China;1. School of Metallurgy Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China;2. National and Local Joint Engineering Research Functional Center for Materials Processing, Xi’an University of Architecture and Technology, Xi’an 710055, China;3. Rising Rare Metchem Co., Ltd., Shangluo 726100, China;4. School of Mechanical and Electrical Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China |
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| Abstract: | We have analyzed the Mössbauer hyperfine magnetic spectra of six compositions of Au-Fe from 10.5 to 33 at.% Fe at temperatures ranging from 4.2 K to the magnetic ordering temperature of each alloy. Only two elementary magnetic hyperfine spectra are required to fit the data, each of which has its own value of the magnetic hyperfine field, quadrupole coupling, isomer shift, and relative intensities. The intensity ratios of the two spectra for a given Fe concentration are essentially invariant with temperature. These results point to the existence of two chemically different Fe sites with all the Fe atoms magnetically coupled over the entire temperature regime below the upper magnetic ordering temperature. A relatively sharp increase in the local moment commences at both Fe sites, at ∼ 17 at.% Fe and continues to increase with Fe concentration. |
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