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Analysis of atomic arrangement in magnetic Fe–Pt nanoparticles |
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| Authors: | H. Sakuma T. Taniyama K. Ishii Y. Kitamoto Y. Yamazaki |
| Affiliation: | aDepartment of Electrical and Electronic Engineering, Utsunomiya University, Utsunomiya 321-8585, Japan bMaterials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, Japan cDepartment of Innovative and Engineered Materials, Tokyo Institute of Technology, Yokohama 226-8502, Japan |
| Abstract: | The order parameter S of Fe–Pt nanoparticles is estimated from X-ray diffraction (XRD) patterns. The total intensity of a diffraction peak is obtained by Rietveld analysis as well as simply integrating the intensity. The Rietveld analysis is found to provide a plausible value of S even for a sample showing an XRD pattern with broad and overlapped peaks. Another order parameter Q, which is obtained from Mössbauer spectra, is introduced, and it is confirmed that Q is equivalent to the probability of Fe atoms being in the L10-type atomic arrangement. The coercivity of Fe–Pt nanoparticles is directly proportional to Q, while it vanishes at S=0.4, indicating that the magnetic property of Fe–Pt nanoparticles has a closer relationship to Q than S. |
| Keywords: | Atomic arrangement Fe–Pt nanoparticles Mössbauer spectroscopy Order parameter Rietveld analysis |
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