The temperature dependence of the57Fe hyperfine magnetic field distribution in Fe-Ni |
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| Authors: | B. Fultz J. W. Morris Jr. |
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| Affiliation: | (1) Materials and Molecular Research Div., Lawrence Berkeley Lab., University of California, 94720 Berkeley, California, USA;(2) The Dept. of Materials Science and Mineral Engineering, University of California, 94720 Berkeley, California, USA;(3) Present address: Keck Lab. of Engineering Materials, Califorinia Institute of Technology, 91125 Pasadena, Calif., USA |
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| Abstract: | The temperature dependence of the57Fe hyperfine magnetic field (hmf) in Fe-Ni is stronger than the temperature dependence of the57Fe hmf in pure Fe. By analyzing the shape of the57Fe hmf distribution, and with the help of experiments with Si in Fe-Ni, we deduce that this anomalous temperature dependence originates from a large thermal sensitivity of the magnetic moments at those Fe atoms with more Ni nearest neighbors. A strong temperature dependence of the recoilfree fraction was also observed in Fe-Ni alloys. We suggest that a large mean square thermal displacement of Fe atoms in Fe-Ni is the cause of the anomalous temperature dependence. |
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