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Temperature dependence of hyperfine magnetic fields in Fe-Ni

Fultz, B. and Morris, J. W., Jr. (1986) Temperature dependence of hyperfine magnetic fields in Fe-Ni. Physical Review B, 34 (7). pp. 4480-4489. ISSN 0163-1829. http://resolver.caltech.edu/CaltechAUTHORS:FULprb86

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Abstract

The 57Fe hyperfine magnetic field (HMF) distribution in bcc Fe-Ni alloys was calculated with a model of linear response of the 57Fe HMF to magnetic moments in the alloy. With the use of empirical parameters, the model largely accounts for the 57Fe HMF distribution at low temperatures. As shown by experiments with Si solutes in Fe-Ni, the anomalously strong temperature dependence of the 57Fe HMF in Fe-Ni is not due to the temperature dependence of the HMF response parameters. By analyzing the shape of the 57Fe HMF distribution, we find that this anomalous temperature dependence results from a large thermal sensitivity of the magnetic moments at those Fe atoms with more Ni atoms as nearest neighbors. This correlated with a strong temperature dependence of the recoil-free fraction and the second-order Doppler shift in Fe-Ni. We suggest that the large mean-square thermal displacement of Fe atoms in Fe-Ni is the cause of the anomalously strong temperature dependence, and we offer two explanations for this effect. Additionally, we have found evidence for a pseudodipolar interaction in Fe-Ni, and we also discuss the problems of parametrizing the 57Fe HMF solely in terms of the number of nearest neighbors of the 57Fe atom.


Item Type:Article
Additional Information:©1986 The American Physical Society Received 29 April 1985 The authors are grateful to T. Lindsey for important discussions and suggesitons. This work was supported by the Director, Office of Energy Research, Office of Basic Energy Science, Materials Science Division of the U.S. Department of Energy under Contract No. DE-AC03-76SF00098.
Record Number:CaltechAUTHORS:FULprb86
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:FULprb86
Alternative URL:http://dx.doi.org/10.1103/PhysRevB.34.4480
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:2593
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:11 Apr 2006
Last Modified:26 Dec 2012 08:49

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